User manual
µRack
Standard compressor racks single/two circuit
User manual
NO POWER
& SIGNAL
CABLES
TOGETHER
READ CAREFULLY IN THE TEXT!
WARNINGS
CAREL bases the development of its products on decades of experience in HVAC, on the continuous investments in technological innovations to products, procedures and strict quality
processes with in-circuit and functional testing on 100% of its products, and on the most innovative production technology available on the market. CAREL and its subsidiaries nonetheless
cannot guarantee that all the aspects of the product and the software included with the product respond to the requirements of the final application, despite the product being developed
according to start-of-the-art techniques. The customer (manufacturer, developer or installer of the final equipment) accepts all liability and risk relating to the configuration of the product in
order to reach the expected results in relation to the specific final installation and/or equipment. CAREL may, based on specific agreements, acts as a consultant for the positive
commissioning of the final unit/application, however in no case does it accept liability for the correct operation of the final equipment/system.
The CAREL product is a state-of-the-art product, whose operation is specified in the technical documentation supplied with the product or can be downloaded, even prior to purchase, from
the website www.carel.com.
Each CAREL product, in relation to its advanced level of technology, requires setup / configuration / programming / commissioning to be able to operate in the best possible way for the
specific application. The failure to complete such operations, which are required/indicated in the user manual, may cause the final product to malfunction; CAREL accepts no liability in such
cases.
Only qualified personnel may install or carry out technical service on the product.
The customer must only use the product in the manner described in the documentation relating to the product.
In addition to observing any further warnings described in this manual, the following warnings must be heeded for all CAREL products:
•
Prevent the electronic circuits from getting wet. Rain, humidity and all types of liquids or condensate contain corrosive minerals that may damage the electronic circuits. In any case,
the product should be used or stored in environments that comply with the temperature and humidity limits specified in the manual.
•
Do not install the device in particularly hot environments. Too high temperatures may reduce the life of electronic devices, damage them and deform or melt the plastic parts. In any
case, the product should be used or stored in environments that comply with the temperature and humidity limits specified in the manual.
•
Do not attempt to open the device in any way other than described in the manual.
•
Do not drop, hit or shake the device, as the internal circuits and mechanisms may be irreparably damaged.
•
Do not use corrosive chemicals, solvents or aggressive detergents to clean the device.
•
Do not use the product for applications other than those specified in the technical manual.
All of the above suggestions likewise apply to the controllers, serial boards, programming keys or any other accessory in the CAREL product portfolio.
CAREL adopts a policy of continual development. Consequently, CAREL reserves the right to make changes and improvements to any product described in this document without prior
warning.
The technical specifications shown in the manual may be changed without prior warning.
The liability of CAREL in relation to its products is specified in the CAREL general contract conditions, available on the website www.carel.com and/or by specific agreements with customers;
specifically, to the extent where allowed by applicable legislation, in no case will CAREL, its employees or subsidiaries be liable for any lost earnings or sales, losses of data and information,
costs of replacement goods or services, damage to things or people, downtime or any direct, indirect, incidental, actual, punitive, exemplary, special or consequential damage of any kind
whatsoever, whether contractual, extra-contractual or due to negligence, or any other liabilities deriving from the installation, use or impossibility to use the product, even if CAREL or its
subsidiaries are warned of the possibility of such damage.
DISPOSAL
INFORMATION FOR USERS ON THE CORRECT HANDLING OF WASTE ELECTRICAL AND ELECTRONIC EQUIPMENT (WEEE)
In reference to European Union directive 2002/96/EC issued on 27 January 2003 and the related national legislation, please note that:
1. WEEE cannot be disposed of as municipal waste and such waste must be collected and disposed of separately;
2. The public or private waste collection systems defined by local legislation must be used. In addition, the equipment can be returned to the distributor at the end of its working life when
buying new equipment.
3. The equipment may contain hazardous substances: the improper use or incorrect disposal of such may have negative effects on human health and on the environment;
4. The symbol (crossed-out wheeled bin) shown on the product or on the packaging and on the instruction sheet indicates that the equipment has been introduced onto the market after
13 August 2005 and that it must be disposed of separately;
5. In the event of illegal disposal of electrical and electronic waste, the penalties are specified by local waste disposal legislation.
NO POWER
& SIGNAL
CABLES
TOGETHER
READ CAREFULLY IN THE TEXT!
WARNING: separate as much as possible the probe and digital input signal cables from the cables carrying inductive loads and power cables to avoid possible electromagnetic disturbance.
Never run power cables (including the electrical panel wiring) and signal cables in the same conduits
CON
NTENTS
1
1.1
1.2
2
2.1
2.2
3
3.1
3.2
3.3
4
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
5
5.1
5.2
5.3
5.4
5.5
6
6.1
6.2
6.3
6.4
6.5
6.6
7
7.1
7.2
7.3
7.4
7.5
8
8.1
8.2
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
PRODUCT ............................................................................................................................................................................................................................................7
General functtions ............................................................... ................................................................................................................................7
Main charactteristics ........................................................... ................................................................................................................................7
USER INTERFAACE ...............................................................................................................................................................................................................................8
Buttons - LED
Ds - Icons ........................................................ ................................................................................................................................8
LED display aand Icons ......................................................... ................................................................................................................................9
STARTING TH
HE UNIT ...................................................................................................................................................................................................................... 10
Starting for thhe first time .................................................... ............................................................................................................................. 10
Unit configuraation ............................................................... ............................................................................................................................. 10
Meaning of thhe inputs / outpputs ......................................... ............................................................................................................................. 10
COMPRESSOR MANAGEMEN
NT ................................................................................................................................................................................................... 13
General settinngs ................................................................. ............................................................................................................................. 13
Compressor rrotation ........................................................... ............................................................................................................................. 13
Compressor ccontrol ............................................................ ............................................................................................................................. 13
Number of coompressors started with probee 1 fault ............ ............................................................................................................................. 14
Compressorss with different capacities
c
............................... ............................................................................................................................. 15
Manually enaable/disable the compressors ......................... ............................................................................................................................. 15
Special MT-LLT units ............................................................ ............................................................................................................................. 16
Compressor ttime settings .................................................. ............................................................................................................................. 16
FAN AND INVVERTER MANAG
GEMENT ......................................................................................................................................................................................... 18
Fan managem
ment ............................................................... ............................................................................................................................. 18
Dead band coontrol .............................................................. ............................................................................................................................. 18
Inverter manaagement ......................................................... ............................................................................................................................. 19
PWM-PPM m
management.................................................... ............................................................................................................................. 21
Floating conddenser control ................................................. ............................................................................................................................. 21
VARIOUS SETTTINGS ....................................................................................................................................................................................................................... 22
Manual devicce operation .................................................... ............................................................................................................................. 22
Compressor hhour counter annd maintenancee alarm ............. ............................................................................................................................. 22
Set point variiation from digittal input................................... ............................................................................................................................. 22
Type of refriggerant .............................................................. ............................................................................................................................. 22
Auxiliary probbe managementt .............................................. ............................................................................................................................. 22
Prevent high discharge presssure ........................................ ............................................................................................................................. 23
ALARM MANAAGEMENT ................................................................................................................................................................................................................. 24
Alarms with aautomatic resett .............................................. ............................................................................................................................. 24
Alarms with m
manual reset .................................................. ............................................................................................................................. 24
Semiautomattic alarms ....................................................... ............................................................................................................................. 24
Alarm relay ......................................................................... ............................................................................................................................. 24
Alarms from analogue inputss: temperature probe and presssure transducer: .................................................................................................. 25
THE SUPERVISOR NETWORKK ...................................................................................................................................................................................................... 26
Serial boards ...................................................................... ............................................................................................................................. 26
Communicatiion protocols................................................... ............................................................................................................................. 26
USER INTERFAACE ............................................................................................................................................................................................................................ 26
LIST OF PARAAMETERS .................................................................................................................................................................................................................... 27
ON/OFF FAN CONTROL BOAARD (CODE CO
ONVONOFF0)..................................................................................................................................................... 32
O 10 VDC (OR 4 TO 20 MA) CO
ONVERSION BO
OARD FOR FANSS (CODE CONV
V0/10A0) .......................................................................... 33
PWM TO 0 TO
PROGRAMMING KEY (CODEE PSOPZKEYA0) ............................................................................................................................................................................ 33
SUPERVISOR MANAGEMENTT ...................................................................................................................................................................................................... 33
DEFAULT CONFIGURATIONSS ...................................................................................................................................................................................................... 36
GLOSSARY ........................................................................................................................................................................................................................................ 37
TECHNICAL SSPECIFICATION ............................
.
............................................................................................................................................................................ 37
PRODUCT CO
ODES LIST.................................................................................................................................................................................................................. 38
APPENDIX: CO
OMPRESSOR RAACK CONTROLLLER, EXAMPLES OF APPLICATIO
ON DIAGRAMS ........................................................................................... 39
APPENDIX: CH
HANGES INTRO
ODUCED IN FW RELEASE 2.0 FO
OR MRK0000XXX0 .................................................................................................................. 41
APPENDIX: CH
HANGES INTRO
ODUCED IN FW RELEASE 2.1 ..................................................................................................................................................... 42
APPENDIX: CH
HANGES INTRO
ODUCED IN FW RELEASE 2.2 ..................................................................................................................................................... 42
APPENDIX: CH
HANGES INTRO
ODUCED IN FW RELEASE 2.3 ..................................................................................................................................................... 42
μRack
1
Product
1.1
General ffunctions
1.
1
2.
2
3.
3
4.
4
5.
5
6.
6
7.
7
8.
8
9.
9
10.
1
11.
1
12.
1
13.
1
14.
1
15.
1
16.
1
1.2
Read pressuure transducers, diisplay data in BARR/°C (depending oon the type of refrrigerant gas)
Managemennt of compressors with the same annd different capac ities
Managemennt of compressor racks
r
with two circcuits, MT and LT
Setting of the number of com
mpressors – fans on the unit
Rotation of tthe compressors (FIFO
(
and by timee). FIFO rotation oof the fans.
Fan speed control (PWM OUTTPUT)
Compressorr and fan dead band management
Possibility too enter the compressor set point in BAR and displaay the value in °C
C by pressing the “UP” and “DOW
WN” buttons togetther when displayying the
parameter vvalues.
Possibility too enter the fan sett point in BAR or degrees
d
centigradee, depending on the
t control probe used (pressure oor NTC).
Multifunction input: general HP
H alarm, ON/OFFF, change SET POIINT,…
Set point varriation from digitaal input
Possibility too set the compresssor-fan thermal ovverload/generic allarm as automaticc/manual
Enable comppressors from thee “Maintenance” screen
Proportionall plus integral function for the fan innverter.
Floating conndenser set point
Optional tem
mperature probes, with high tempeerature alarm thresshold:
a- O
Outside air
b- AAmbient air
c- CCompressor dischharge temperaturee
d- SSuction temperatuure
Main cha
aracteristics
Main functions
f
• Control of com
mpressor suction pressure
p
• Control of condensing pressure (compressor disccharge)
• Complete mannagement of the outputs
o
available;
• Complete alarm
m management;
• Connection to serial line for suppervision / telemaiintenance;
Devicees controlled
Comprressors (up to 4 hhermetic compresssors, no part up too 2 hermetic-loadd capacity-controlleed compressors)
• Condenser fanns (max 4)
• PWM speed coontrol
Prograamming
• Display and coontrol of the valuees measured, on LED display
• Three levels off parameter protecction: SEL (USER), PRG (INSTALLERR), SEL+PRG (MAN
NUFACTURER)
• Possibility to coonfigure all the unnit parameters using a hardware keey.
• Possibility to coonfigure the mainn unit parameters via serial line.
• Possibility to m
modify the access level
l
to the param
meters from the keeypad (only from MANUFACTURER
R level).
Hardw
ware
• The product coomes ready for paanel installation, 32x74, and DIN raiil mounting.
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
7
μRack
2
User interfface
The prroduct uses a 3 digit LED display with minus sign andd decimal point too display the monnitored values, and
d ICONS for the sstatus of the devicces and operating modes.
As welll as displaying thhe values measureed and the operaating conditions oof the unit, the usser terminal (displlay and keypad) ccan be used to modify
m
the unit opperating
parameters. The following figures show thhe µRack for paneel installation and for DIN rail mounnting.
Fig. 2.a
2.1
Buttons - LEDs - Ico
ons
Button
Deescription
aa) Press the button, when switchingg the instrument oon, until the stringg “DEF” is shown on
o the display, to load the default values.
v
bb) Press the button for more than 5 sec, to set the paassword for accessing the INSTALLEER parameters.
cc) Press the buttoon for more than 3 sec, when thee list of parameteers is displayed, to
o accept the moddifications and return to the main display
((control pressure//temperature)
dd) Press the button for more than 3 sec when the lisst of parameter grroups is displayed, “-/-”, “-C-”, “-r-”,, “-A-”, “-M-”, to reeturn to the main display
((control pressure//temperature)
aa) Press the button for more than 5 sec to select betw
ween the display of the values in “B
BAR” or “°C”.
bb) Press the button when the list off parameters is dissplayed to move to
t the next parameter.
cc) Press the buttonn when the numeeric value of a paraameter is displayeed to increase the value.
dd) Press the button when a digital value
v
is displayed (YES-NO) to channge the setting.
aa) Press the button for more than 5 sec to set the pa ssword for accesssing the USER paraameters.
bb) Press the button when the list off parameters is dissplayed to show thhe numeric value of the parameterr.
cc) Press the buttonn when the numeeric value of a paraameter is displayeed to accept the numeric value andd return to the list of parameters.
aa) Press the button to display the otther controlled vaalues. The “label” of the probe will be
b displayed, andd then the numeric value.
EExample:
U
Unit “A” single circcuit
--standard LP1
--the arrows scroll to
t HP-B2 –B3
U
Unit “B” two circuit
--standard LP1
--the arrows scroll to
t LP2-HP-B3
+
+
bb) Press the button for more than 5 sec to select the probe displayed permanently as th
he main probe.
cc) Press the buttonn when the list of parameters is dissplayed to move too the previous parameter
dd) Press the button when the numeeric value of a parrameter is displayeed to decrease thee value.
ee) Press the button when a digital value
v
is displayed (YES-NO) to channge the setting
PPress the two butttons together for 5 seconds to set thhe PWD for accesssing the MANUFA
ACTURER parametters and thus configuring the controller.
PPress the two butttons together, wheen the numeric vaalue of one of thee following parameeters is displayed::
1. comp//fan set point
2. high/loow threshold
tto switch the displlay of the same paarameter from BAAR to °C.
T 2.a
Tab.
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
8
μRack
2.2
LED display and Icons
The display shows the control value, temperature or pressure. depending on the selection made from the keypad.
In the event of alarms, the display shows the monitored and the alarm information in sequence.
ICONS
Description
On when the unit of measure selected is BAR
On when the unit of measure selected is °C
On when there is an ACTIVE ALARM
1) On when the MANUFACTURER parameters are being configured
2) If flashing with the ALARM icon indicates the compressor maintenance hours have been exceeded.
1) On when the value read by the suction probe is displayed
2) If flashing with the ALARM icon indicates the activation of suction probe alarms:
High Temp.
Low Temp.
Probe not connected
1) On when the value read by the discharge probe is displayed
2) If flashing with the ALARM icon indicates the activation of discharge probe alarms:
High Temp.
Probe not connected
1) On when the fan parameters are being configured.
2) On when at least one fan is operating
3) If flashing with the ALARM icon indicates the activation of fan alarms
1) On when the compressor parameters are being configured.
2) On if at least one compressor step is active
3) If flashing with the ALARM icon indicates the activation of the compressor alarms
1
2
3
4
1) Indicates the state of the compressors and capacity control on
2) If flashing indicates the ON/OFF call for a new compressor step, while the device is awaiting the expiry of the delay times.
3) If the controller is used for fan control only (“/01”=0) then the icon shows the status of the fans.
Tab. 2.b
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
9
μRack
3
3.1
Starting thhe unit
Starting for the firsst time
After having
h
checked thee connections, poower-up the unit.
When started for the firsst time, the controoller performs a LA
AMP TEST and usses the default values selected by CAREL for all the coonfiguration param
meters:
Unit with
w 2 compressorss + 2 fans + alarm
m relay.
3.2
Unit conffiguration
The unnit can be set as single or two circuit, the number of compressors for oone or two circuits using parameter /01; the numberr of fans can then be set using paraameter
/09. Thhe maximum num
mber of devices, coompressors + fans, is 5 (maximum number of relayss).
First thhe compressors + capacity controol and then the fanns will be allocatedd, in sequence.
Relay no.
n 5 may be:
•
an alarm
•
a fan
The seelection is made automatically according to the numbber of devices (fanns and compressoors) selected.
If 4 deevices are selectedd (e.g.: 2 compresssors (not capacityy-controlled) + 2 fans) relay 5 cann be used as an allarm relay (defaullt setting), while iff 5 devices are controlled
(e.g.: 2 compressors (noot capacity-contrrolled) + 3 fans), output no. 5 is a utomatically usedd to control a fan. In addition, the use of speed conntrol, by phase control or
inverteer, can be set for tthe fans, managedd using the PWM signal.
3.2.1
Input configguration
Inputs from 1 to 4 are aalarm inputs for thhe compressors annd fans configuredd. If 5 devices are controlled by thee unit, input no. 5 is automatically an
a alarm input (fan alarm
only). The user can deccide whether the alarm inputs are normally closed ((the alarm condition exists when th
he contact is openn) or normally oppen (the alarm coondition
exists when
w
the contact is closed) by settiing parameter /144.
If 4 devices , or less, aree connected to thee controller, input 5 automatically bbecomes a multifuunction input.
Parameter /15 can be used to configure the
t multifunction input:
•
0: no functioon
•
1: unit ON-O
OFF (ON contact NC)
N
•
2: change seet point (set1- set22)
•
3: general high pressure switcch NC
•
4: general high pressure switcch 1 NO
•
5: general loow pressure switchh circuit 1 NC
•
6: general loow pressure switchh circuit 1 NO
•
7: general loow pressure switchh circuit 2 NC
•
8: general loow pressure switchh circuit 2NA
•
9: liquid leveel alarm NC
•
10: liquid levvel alarm NO
•
11: fan therm
mal overload/generic NC
•
12: fan therm
mal overload/generic NO
3.2.2
Unit ON/OFFF
The coontroller is normallly configured as always
a
ON.
The unnit can be switcheed on and off by:
1.
1
Alarm (param
meter A22 can bee used to select whether
w
or not a brroken probe alarm
m should switch th
he unit off).
2.
2
Supervisor ((parameter /38 caan be used to enable unit shutdownn from the supervvisor).
3.
3
Digital inputt (parameter /15 can
c be used to coonfigure the multiffunction input as ON/OFF).
O
4.
4
Parameter (pparameter /39 can be used to switcch the unit on or off)
Shuttinng down the unit, as shown on the display by the meessage “OFF”:
•
switches thee controller off;
•
stops the management of thee various devices and
a the related al arms.
3.3
3.3.1
Meaning of the inpu
uts / outpu
uts
Table of an alogue inputs
The
T tables below ddescribe the type of the probes thaat can be connecteed to the inputs and their characterristics.
Analoggue inputs
Input
Descriptio n
Type of pro
obes that can be connected
B1
Ratiometricc discharge pressuure probe
RATIOMETR
RIC pressure probee (0 to 5 Volt) or NTC if /16
B2
Room temperature probe (ddisplay) / auxiliaryy probe
CAREL NTC temperature probbe (-50T100°C; R//T 10 k at 25°C)
B3
Outside airr temperature proobe (floating condenser control) / a uxiliary probe
CAREL NTC temperature probbe (-50T100°C; R//T 10 k at 25°C)
B4
Ratiometricc suction pressuree probe / probe inn 2nd circuit
RATIOMETR
RIC pressure probee (0 to 5 Volt)
T 3.a
Tab.
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
10
μRack
Digital inputs
Input
Description
ID1
Compressor 1 / fan alarm
Type of device connected
ID2
Compressor 2 / fan alarm
Generic compressor / fan alarm. Voltage-free contact.
ID3
Compressor 3 / fan alarm
Generic compressor / fan alarm. Voltage-free contact.
ID4
Compressor 4 / fan alarm
Generic compressor / fan alarm. Voltage-free contact.
ID5
Fan alarm / Multifunction input
Generic alarm:
- compressor/fan.
- from general high/low pressure switch.
- fan thermal overload.
- liquid level.
Unit On-Off. Voltage-free contact.
Generic compressor/fan alarm. Voltage-free contact.
Tab. 3.b
Digital outputs
Input
Description
No1-C1
Compressor 1 / fan
Type of device connected
Power contactor for starting the compressor / fan
No2-C2
Compressor 2 / capacity-control /fan
Power contactor for starting the compressor / Power contactor for capacity control activation / fan
No3-C3
Compressor 3 / capacity-control / fan
Power contactor for starting the compressor / Power contactor for capacity control activation / fan
No4-C4
Compressor 4 / capacity-control / fan
Power contactor for starting the compressor / Power contactor for capacity control activation / fan
No5-C5
Alarm / fan
Power contactor for starting the fan / voltage-free contact for signalling unit alarm
Tab. 3.c
Analogue outputs
Outputs
Y1
Description
Fans speed controller (PWM)
Tab. 3.d
3.3.2
Wiring diagrams:
Panel installation:
N
Line
alarm 3
multifunctionD.I./alarm
alarm 1
alarm 2
alarm 4
amb. temp. probe
ext. temp. probe
L
P
PSOPZKEY*
24 V
P
N
Line
L
TRADR1W04
Fig. 3.a
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
11
MCH2004850
μRack
DIN rail installation:
Rack
FCSER00000
N
Line
L
Rack
alarm 3
multifunction D.I./alarm
alarm 1
alarm 2
alarm 4
amb. temp. probe
ext. temp. probe
FCSER00000
P
24 V
P
N
Line
L
TRADR1W04
Fig. 3.b
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
12
μRack
4
Compress or manageement
Inputs used:
• Sucttion pressure probbe/probes
• Digital inputs dedicatted to the compreessor safety devicees
• Mulltifunction input foor generic alarm (general
(
suction pressure switch 1 aand 2)
Outputs used:
• Com
mpressor outputss and capacity control
4.1
General ssettings
Parameters used for ON
N/OFF control:
• number
n
of compreessors (capacity-ccontrolled and noot)
• compressor
c
times
• tyype of control
The coompressors are managed by the controller based on a pressure set pooint (parameter r001) and differentiaal (parameter r02)), measured by the suction probe.
In the case of two circuits, the set point and the differential also need to be set for the secondd circuit (parameteers r03 and r04).
4.2
Compresssor rotatio
on
Rotatioon (parameter r055) of the compresssor calls ensures that the number oof operating hourrs and the number of starts of the ddifferent compresssors balance out.
Rotatioon automatically eexcludes any comppressors with alarm or that are disaabled.
If the compressor
c
is offf for alarm or disaabled, is excludedd from regulation and rotation; thee activation/deacttivation threshold s are re-calculateed based from acctual
numbeer of compressorss available.
In the default configurattion, FIFO rotationn has been selecteed.
Three different types of rotation can be seet: for the capacity control, only ddevices rotation tyype available is LIFO (no dependinng by r05) param
meter:
r
(no rota tion)
LIFO rotation
The firrst compressor to start will be the laast to stop, first caapacity control a ctivated will be the
t last deactivatted:
• Sttart: C1,C2,C3,C4.
• Sttop:C4,C3,C2,C1.
FIFO rotation
r
The firrst compressor to start will be the first to stop.
• Sttart: C1,C2,C3,C4
• Sttop: C1,C2,C3,C4.
This seelection enables thhe rotation of the compressors so as
a to even out as m
much as possible the number of co
ompressor operatting hours.
Rotatioon by time
The coompressor that staarts will be the one with the lowest number of operaating hours. When stopping the exact opposite is truee, that is, the compressor with the highest
h
numbeer of operating hoours will stop.
4.3
Compresssor contro
ol
In the default configurattion, “dead band”” control is activateed (parameter r066).
Proportional band
Proporrtional band contrrol calculates, baseed on various parameters (SP, DF aand the number of
o devices set) thee points where thee devices must sw
witch on and off, innside
the diffferential band. Paarameters r01 (sett point) r02 (differrential).
Figure 4.1 shows the acttivation points forr a system with 4 steps.
s
Settingg the parameters llisted above, eachh individual step will
w have a differenntial as follows:
SP + 1 *DF/ (No. of stepps) for the first;
SP + 2 *DF/ (No. of stepps) for the secondd;
…
SP + DF
D
for the last.
com
mpr./capac. contr.
1° compr.
compr./ capac. co
ontr.
co
ompr./ capac.
ON
t
OFF
DF
F
RP
Key:
SP
Compressor set point (r01)
DF
Compressor diffferential (r02)
RP
Pressure read
Fig 4.a
Dead band
This tyype of control feattures the definitioon of a dead bandd to the side of thhe set point, within which no device is started or stoopped. The devicees are activated when the
measuured value exceedds the limit to the right (measured value greater thaan SP + DZN, seee Figure 4.3). The number of devicces to be activatedd varies accordingg to the
time elapsed
e
outside of the dead band. The first device will start immedi ately, while the others
o
will wait th
he set time betweeen starts (r07). Similarly,
S
the devices are
stoppeed when the meassured value falls below
b
the dead baand (measured vaalue less than the set point), and reemains there for a period equal to the time betweenn device
stop reequests. In this casse too, the first deevice stops immeddiately, while the oothers wait the deelay time between
n stops (r09).
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μRack
Also see the paragraph on Time settings.
The program will switch the devices on according to the start-up logic configured and the availability of the devices
DOffZ
NZ
DOnZ
DZN
RP
SP
Fig. 4.b
Key:
DOffZ
Device deactivation zone
DOnZ
Device activation zone
NZ
Dead band
DZN
Dead band differential
RP
Suction pressure read
SP
Set point
Compressor dead band with variable times
The user can decide to set a variable time between calls, depending on whether the pressure is moving away from the dead band. In particular, the activation /
deactivation time of the outputs decreases as the distance from the dead band increases. To set this function, the following parameters must be configured:
•
Maximum compressor on time/ capacity control (parameter r08)
•
Minimum compressor on time/ capacity control (parameter r07)
•
Pressure differential within which the time varies. (parameter r11)
•
Maximum compressor off time/ capacity control (parameter r10)
•
Minimum compressor off time/ capacity control (parameter r09)
DTNZ
DTNZ
RBM
TOffMax
TOnMax
TOffMin
TOnMin
DOffZ
NZ
DOnZ
STPM
B
InPress [ºbar]
Fig. 4.c
Key:
InPress
Suction pressure
DTNZ
Differential within which the time varies
STPM
Control set point
TOnMax
Maximum compressor on time
RBM
Control band
TOnMin
Minimum compressor on time
NZ
Dead band
TOffMax
Maximum compressor off time
DOnZ
Device activation zone
TOffMin
Minimum compressor off time
DOffZ
Device deactivation zone
In the activation phase, the following cases are possible:
1. Pressure equal to point b
same call time as the “maximum compressor on time”
2. Pressure between point b and point b + DTNZ
type of call between “Max on time” and “Min on time”
3. Pressure greater than or equal to point b + DTNZ
same call time as “Min on time”
In the deactivation phase, on the other hand, the following cases are possible:
1. Pressure equal to point STPM
same call time as the “maximum compressor off time”
2. Pressure between point STPM and point STPM - DTNZ
type of call between “Max off time” and “Min off time”
3. Pressure greater than or equal to point STPM - DTNZ
same call time as “Min off time”
N.B. To make the device call time constant in the activation phase, simply set the times TOnMax and TonMin to the same value. The same is true for the deactivation
phase.
4.4
Number of compressors started with probe 1 fault
In the event of a suction probe fault or not connected alarm, parameter /07 indicates the number of outputs (compressors and capacity control, configured with
capacity-controlled compressors), forced on, so as to ensure minimum cooling/operation of the installation.
For two circuits, the parameter relating to the second circuit /08 must also be set. This will be related to the probe in the 2nd circuit.
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
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μRack
4.5
Compressors with different capacities
Parameter /02 is used to choose the option of compressors with different capacities.
This allows more load steps and therefore finer control.
Once the capacity of the individual compressors has been defined (parameters /03, /04, /05, /06), the software, based on the requirements of the installation and the
compressors available (without alarms or timers), will calculate the most suitable combination to satisfy the requirement. Whenever the requirement changes, the
software recalculates the most suitable combination. The combination will always be greater than or equal to the requirement.
If two compressors have the same capacity, the compressor with the lower index will always be the first to start.
4.5.1
Proportional band control with different capacity compressors
Based on the pressure, the set point and the differential, the software will proportionally calculate the capacity required to bring the pressure back near the set point.
At the set point plus differential the requirement will be at the maximum value, while it will be null for pressure values around or less than the set point.
Capacity _ required =
Max _ Capacity × ( Setpoint − press)
Differential
4.5.2
Dead band control with different capacity compressors
The software will calculate the maximum number of combinations possible with the compressors available.
At certain intervals of time (see the paragraph on Compressor dead band with variable times), the software will call a sequence with a higher capacity.
In the deactivation phase, the opposite will occur, while in the dead band no compressors will be started or stopped.
An increase in the requirement will correspond to a different combination.
DOffZ
NZ
DOnZ
DZN
RP
SP
Fig 4.d
Key:
DOffZ
Device deactivation zone
DOnZ
Device activation zone
NZ
Dead band
DZN
Dead band differential
RP
Suction pressure read
SP
Set point: compressors (S2); fans (S1)
4.5.3
Example of compressors with different capacities
The following example looks at an installation featuring 3 compressors with different capacities, using proportional band control. As can be seen, there are 8 possible
combinations available.
Set point
1.0
bar
“r01”
Differential
2.0
bar
“r02”
Comp1
5
kW
“/03”
Comp2
7
kW
“/04”
Comp3
15
kW
“/05”
Maximum capacity
27
kW
“/06”
Pressure
Requirement kW
Comp1
1.1
1.35
X
Comp2
1.6
8.1
X
X
12
1.8
10.8
X
X
12
2
13.5
X
15
2.1
14.85
X
15
2.4
18.9
Total active capacity kW
X
20
2.5
20.25
3
27
5
X
X
Comp3
X
X
22
X
X
27
Tab 4.a
4.6
Manually enable/disable the compressors
A compressor can be temporarily disabled from the control sequence. This function is very useful when needing to perform maintenance on an individual compressor.
The corresponding alarms are still managed.
The following parameters are used: M01,M02,M03,M04 to enable the manual operation of the compressors. The real manual function is managed using parameters:
M05,M06,M07,M08.
On unit models with capacity control (/01=9,10,...14) the compressors cannot be manually enabled/disabled directly. To exploit parameters M01,..,M08, the unit
model needs to be changed (/01=1 for configurations 9, 10 and 11; /01=3 for configurations 12 and 13; /01=4 for configuration 14).
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
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μRack
4.7
Special M
MT-LT unitss
4.7.1
Managemennt of compressor racks with LT and MT circuits a nd condenser onnly.
The haardware features oof the µRack contrroller can be adappted for the controol of a special typee of compressor rack that is becom
ming more widely used in small andd
medium installations, haaving the advantage of being comppact and offering llow cost solutionss. These are compressor racks with only the condenssing section, and with
w fan
speed managed by the speed controller or
o external pressure switches, and sseparate managem
ment of the comp
pressors in the MTT and LT units.
Below is an example diaagram:
Floating condenser SET POIN
NT
Douuble circuit
com
mpressor unit
μRaack
MT display cabinet
group
Condenser
Liquid reeceiver
LT display cabinet
Fig 4.ee
This tyype of system can be controlled by µRack in the folloowing conditions:
1.
1
the compresssors must have thhe SAME CAPACITTY
2.
2
the max num
mber of compresssors in the MT uniit and LT unit is 4.. There can thereffore be combinatio
ons of 2+2, 3+1, 1+1. One compreessor rack will be
allocated to probe LP1, and thhe other compressor rack to probe LP2.
4.7.2
Probes and values controlleed
Functionn
Input
Code on display
Type of unnit:
A- Single circcuit compressor rack
B- Compresssor racks with 2 circuits MT-BT
Low prressure circuit 1
B4 (pressure)
LP1
A -B
Low prressure circuit 2
B1 (pressure)
LP2
B
High pressure
p
circuit disscharge
HP
Tempeerature 1
B1 (pressure)
B2 (temperaturre)
B2 (temperaturre)
Tempeerature 2
B3 (temperaturre)
B3
A (press – ttemp)
B (only tem
mp)
A (AUX proobe)
B (not usedd)
Always pres
esent
B2
T 4.b
Tab
4.8
Compresssor time se
ettings
The following is a list of all the time param
meters used for coompressor managgement (and not capacity control).
Time between
b
stop reqquests with HP prevent
p
active
Parameter C06 sets a sttop delay betweenn one compressorr and the next, if thhe high pressure prevention (preveent) function is acctive.
This appplies both in the dead band and inn the proportional band.
Minim
mum compressor ON time
Sets thhe minimum time the compressors stay on, that is, once activated, muust remain on for the
t time set by this parameter (parrameter C01).
R
T[s]
Cm
mp
TMinOn
T[s]
Fig 4.f
Cod. CAREL
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Keey:
R
Compressor call
mp
Cm
Compressor
TM
MinOn
Minim
mum ON time
T
Time
μRack
Minimum compressor OFF time
Sets the minimum time the compressors stay off. The devices are not started again if the minimum time selected (parameter C02) has not elapsed since the last stop.
R
T[s]
Cmp
Key:
R
Compressor call
Cmp
Compressor
TMinOff
Minimum OFF time
T
Time
T[s]
TMinOff
Fig. 4.g
Minimum time between starts of different compressors (proportional band)
This represents the minimum time that must elapse between the start of one device and the next. This parameter allows simultaneous starts to be avoided (parameter
C03).
R
T[s]
Cmp1
Key:
R
Compressor calls
Cmp1
Compressor 1
Cmp2
Compressor 2
TDiffSw Minimum time between starts of different compressor
T
Time
T[s]
Cmp2
TDiffSw
T[s]
Fig 4.h
With capacity control compressors is established fixed delay = 5 s, between a capacity control and the following.
Minimum time between starts of the same compressor
Sets the minimum time that must elapse between two starts of the same compressor.
This parameter limits the number of starts per hour. If, for example, the maximum allowable number of starts per hour is 10, to guarantee this limit simply set a value of
360 (parameter C05).
R
T[s]
Cmp
T[s]
TSameSw
Fig 4.i
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
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Key:
R
Compressor call
Cmp
Compressor
TSameSw
Minimum time between starts of the same compressor
T
Time
μRack
5
Fan and innverter management
Inputs used:
• Disccharge pressure/teemperature probee
• Digital inputs for the fan safety devicess
• Mulltifunction input foor generic alarm (general
(
dischargee pressure switch))
Outputs used:
• Conndenser fan outpuuts
• Conndenser fan speedd control (PWM ouutput)
5.1
Fan management
The opperation of the fanns depends on thee value read by thhe discharge presssure (or temperature) sensor.
One thhermal overload iss featured for eachh fan step. This haas a settable imm ediate reset and will
w only be valid for
f the specific fann. In the default coonfiguration,
“propoortional band” conntrol is set (param
meter r21), and FIFFO rotation (param
meter r20).
5.1.1
Fan control
Proportional band
Proporrtional band contrrol calculates, bassed on various parameters (SP, DF and the numberr of devices set) th
he points where tthe devices must switch on and offf, inside
the diffferential band.
Figure 5.1 shows the acttivation points forr a system with 4 steps.
s
Settingg the parameters llisted above, eachh individual step will
w have a differenntial as follows:
SP + 1 *DF/ (No. of stepps) for the first;
SP + 2 *DF/ (No. of stepps) for the secondd;
…
SP + DF
D
for the last.
ON
OFF
DF
R
RP
Key:
SP
Fan set point
DF
Fan differential
RP
Pressure read
Fig. 5.aa
5.2
Dead ban
nd control
This tyype of control features the definitionn of a dead band to the side of thee set point, within which no device is started or stoppped.
The deevices are activateed when the meassured value exceeeds the limit to thee right (measuredd value greater thaan SP + DZN, seee Figure 5.2). The number of devicees to be
activated varies accordinng to the time elappsed outside of thhe dead band. Thee first device will start
s immediately, while the others will wait the set tiime between startts.
Similarrly, the devices are stopped when the
t measured valuue falls below thee dead band (meaasured value less than
t the set pointt), and remains thhere for a period equal
e
to
the tim
me between devicee stop requests. Inn this case too, the first device stopps immediately, whhile the others waait the delay time bbetween stops.
The prrogram will switchh the devices on according to the start-up logic configgured and the avaailability of the devvices
Fig. 5.b
Key:
DOffZ
Device deacttivation zone
NZ
Dead band
DOnZ
Device activaation zone
DZN
Dead band ddifferential
RP
Discharge prressure read
SP
Fan set pointt
Fan rootation
The rotation of the fanss, settable by parameter r20, is aim
med at balancingg the number of operating hours annd starts of the ddifferent fans.
Rotatioon automatically excludes any fanns with active alarrms.
If the fan
f is off for alarm
m or disabled, is excluded
e
from reggulation and rotattion; the activatioon/deactivation thhresholds are re-ccalculated based from actual num
mber of
fans avvailable.
Two different types of rrotation can be set:
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μRack
LIFO rotation (no rotation parameter r20=0)
The first fan that to start will be the last to stop.
• Start: Fan1, Fan2, Fan3, Fan4.
• Stop: Fan3, Fan3, Fan2, Fan1.
FIFO rotation (parameter r20=1)
The first fan that to start will be the first to stop.
• Start: Fan1, Fan2, Fan3, Fan4.
• Stop: Fan1, Fan2, Fan3, Fan4.
The rotation of the fans is implemented when called.
Various fan parameters
In the event of a discharge probe fault or not connected alarm, parameter /12 sets the number of fans that are forced on.
5.3
Inverter management
The fan controller is enabled by parameter /10.
A minimum limit value can be set for the inverter (parameter r29), as a percentage.
To assist the start of the inverter, a time can be set, expressed in seconds, during which the inverter is forced on at 100% at startup before proceeding with the normal
regulation. This parameter is called “Speed Up Time” (parameter r27).
Key:
STPI
Fan inverter set point
RBI
Inverter differential
Min In
Minimum inverter opening
C
Fan set point + differential
Fig. 5.c
Management of the fans slaved to the compressors
Parameter “/13” defines whether the fans can be activated independently or whether at least one compressor must be on. This is used to prevent the condenser fans
operating with high outside temperatures work when no compressor is operating. Typical application: cold rooms cold stores.
Parameter “/13” default = 0 (independent control).
Inverter control
Proportional band
This control requires the inverter set point STPI to be set (parameter r18 ), plus an inverter differential RBI (parameter r19).
If the value measured by the discharge probe is less than or equal to the value of the inverter set point, the inverter output will be 0.
Between the inverter set point STPI and point C (set point + differential), the value of the inverter output will be proportional to the value read by the discharge probe,
and in any case not less than the minimum inverter output MinIn. If the value measured by the discharge probe is greater than or equal to the inverter set point +
differential, the output will be at the maximum value. The control is not associated with any fan and can work without fans being configured.
Key:
RB
Fan differential
RBI
Inverter differential
STPM
Discharge set point
STPI
Inverter set point
C
Inverter set point + inverter differential
B
Discharge set point + Fan differential
Min In
Minimum value of the inverter control output
Fig.5.d
Proportional control, set by parameter r21, may be proportional only (parameter r21=0) or proportional + integral (parameter r21=1).
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
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μRack
Proportional and integral control (PI)
To minimise any deviations in stable operating conditions between the controlled value and the set point, typical of proportional control, a proportional plus integral
strategy (P+I) can be sued.
This strategy helps overcome situations of stalemate in which the working point remains steadily at a value other than the set point.
PI control adds the integral action to proportional control. This action, when a control error persists, has an increasing effect over time on the overall control action.
The parameter that defines the integral action is the integral time (r22).
The default value is 600 s (10 min). The integral time corresponds to the time taken by the integral action, with a constant error, to balance the proportional action.
The lower the integral time, the faster the response of the control.
For further information, refer to classic control theory.
N.B.: Make sure the integral time is not set too low, otherwise control may become unstable.
The following figure highlights the difference between the proportional control and proportional plus integral control (with inverter):
Proportional control
Proportional + Integral control
RP
RP
SP
SP
T[s]
10 Volt
T[s]
10 Volt
Min In
T[s]
Min In
T[s]
Fig. 5.e
Key:
RP
Pressure read
SP
Set point
T
Time
Min In
Minimum inverter output value
Dead band control
This control requires the setting of inverter set point, the inverter pressure differential for “dead band” control (parameter r21) and the “inverter ramp up time”
(parameter r28).
Three zones are defined: activation zone DOnZ, dead band NZ and deactivation zone DOffZ, in which the program behaves differently (see the figure).
In the activation zone DonZ, the fans are started as follows:
- The inverter is activated as soon as there is demand, with a value no less than the minimum inverter opening MinIn;
- The inverter output is increased according to the times set by parameter r23.
- If the inverter output reaches 100%, the situation persists
In the dead band NZ, the inverter output does not undergo any variation.
In the deactivation zone DoffZ, the fans are stopped as follows:
- The inverter output is progressively brought to the minimum value, according to the times set by parameter r24.
When reaching the minimum value, the fans are stopped.
Key:
Fig. 5.f
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
20
InPress
Discharge pressure
B
Set point + differential
StpM
HP set point
DOnZ
Activation zone
DOffZ
Deactivation zone
NZ
Dead band
T [s]
Time
Inverter
Inverter status
NFan
Number of fans on
μRack
5.4
PWM-PPM management
On the controller, the “fan control” output generates a PWM signal.
This output is used to drive phase control modules that directly control the fan speed.
The output, depending on how it is configured, can generate a pulse width modulation (PWM) signal.
The example below shows two graphs representing the two modes.
In the graph, it can be seen that the request is 80% of the maximum value.
PWM
V
[5 Volt]
T[s]
80%
Fig. 5.g
The PWM signal controls, for example, the CAREL FCS* series, CONVONOFF, CON0/10A0 modules.
ON/OFF fan control board (code CONVONOFF0)
The CONVONOFF0 modules convert the PWM signal sent from terminal Y to an ON/OFF signal. In practical terms, Y can be used to control a relay. Switching power 10A
at 250 Vac in AC1 (1/3 HP inductive).
PWM to 0 to 10 Vdc (or 4 to 20 mA) conversion board for fans (code CONV0/10A0)
The CONV0/10A0 modules convert the PWM signal sent from terminal Y to a standard 0 to 10 Vdc (or 4 to 20 mA) signal.
Calculation of the minimum and maximum fan speed
This procedure should only be performed if fan speed control boards are used (code MCHRTF*0*0). It must be stressed that if the ON/OFF modules (code
CONVONOFF0) or the PWM / 0 to 10 V converters (code CONV0/10A0) or FCS are used, the “Min. triac” parameter (r29) should be set to zero, and the “Max. triac” r30
parameter to the maximum value is the impulse period (r31)=0.
Given the range of different motors existing on the market, the voltages supplied by the electronic board that correspond to the minimum and maximum speed can be
set. For this purpose (and if the default values are not suitable), proceed as follows:
1. Set the fan inverter to always On. Force inverter parameter, M17.
2. Set “Max triac” and “Min triac” to zero.
3. Increase “Max triac” until the fan operates at a speed considered sufficient (make sure that, after having stopped it, it starts rotating if left free);
4. “Copy” this value to the “Min triac” parameter; this sets the voltage corresponding to the minimum speed;
5. Connect a voltmeter (set for 250 V, AC) between the two “L” terminals (the two external contacts).
6. Increase “Max triac” until the voltage stabilises at around 2 Vac (inductive motors) or 1.6, 1.7 Vac (capacitive motors);
7. Once the optimum value is found, it should be seen that even when increasing “Max triac”, the voltage no longer decreases.
8. Do not increase “Max triac” any further, so as to avoid damaging the motor;
9. Set the force inverter parameter back to AUTO.
The operation is now complete.
5.5
Floating condenser control
If this function is enabled using parameter r32, the following parameters need to be set.
a) DELTA T (r33) (condenser exchanger parameter, typically related to the type of condenser used)
b) Minimum condensing pressure (r25 in °C)
c) Maximum condensing pressure (r26 in °C)
The condenser set point is the value resulting from “DELTA T + Outside air temperature”, as with high outside temperatures the condensing temperature cannot be too
low (no possibility of energy savings). This is used to optimise the operation of the fans. The maximum and minimum pressure values are the range in which floating
control can operate.
ATTENTION: enabling this controller, the parameters “r16” (ventilation set) and “r18” (inverter ventilation set) are no more visibile since the relevant set point become
function of the external temperature + delta.
The following parameter are displayed in temperature always, not depending by used probe (pressure or temperature):
r17 (Set the minimum value of suction probe)
r19 (Fan inverter differential)
r25 (Set the lower limit of the fan set point)
r26 (l Set the upper limit of the fan set point)
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
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μRack
6
6.1
Various seettings
Manual d
device operration
The individual devices ccan be activated manually,
m
ignoringg the times and thhe rotation, and independently from the temperaturre control functions, by setting the related
parameters Mxx.
The onnly support providded in manual opeeration is the alarm
m management fuunction.
The manual activation oof the speed contrrollers sets the corrresponding outpuuts to the maximuum value.
When even just one maanual procedure iss enabled, the “MANUFACTURER” iicon on the displaay will FLASH!
If switcching the board offf and on again, thhe function is term
minated.
Imporrtant: Use this funnction with care!! Operating the devices
d
manuallyy may cause dam
mage to the installation!
6.2
Compresssor hour counter and
d maintena
ance alarm
Parameter C07 is used tto set the alarm thhreshold for the maintenance
m
of th e 4 compressors.
This paarameter is expresssed in the hundrreds of hours, as the resolution of thhe display is only 3 digits.
Parameters C08 C10 C112 C14 are used to
t check the number of operating hhours of the comppressors installed.
These parameters are allso expressed in the tens of hours, as the resolution of the display is only
o 3 digits.
Parameters C09 C11 C113 C15 are used to
t reset each indivvidual hour countter.
The coompressor mainteenance alarm is shhown by an alarm code, as well as bby the simultaneoous activation of th
he Maintenance a nd Alarm icons.
6.3
Set pointt variation from digita
al input
This fuunction is useful w
when needing to inncrease or decrease the set point dduring night-time operation.
o
An offsset is added to thee compressor set point when the multifunction
m
inputt, set for this funcction, is closed.
The offfset can be defineed using parameteer R34.
6.4
Type of rrefrigerant
By seleecting the type of refrigerant used in the installation((parameter /35), tthe software will automatically
a
calcu
ulate the conversioon of the pressuree to temperature.
The following table lists the types of gas managed:
m
Refrigerannt
R134a
Coomplete name
Teetrafluoroethane
R290
Prropane
R600
Buutane
R600a
2--methyl propane (isobutane)
(
R717
Am
mmonia (NH3)
R744
Caarbon dioxide (CO
O2)
R404A,R4007C,R410A,R507CC
Mixes
M of gases
Tab. 6.a
6.5
Auxiliary
y probe management
The sooftware can managge two auxiliary teemperature probees, in addition to thhe suction and discharge probes.
The tw
wo probes can be configured with parameters
p
/21 annd /22:
No.
1
Channel
B2
2
B3
N
NTC probe
-rroom temperaturee probe, read-onlyy
-aauxiliary probe
-ooutside temperatuure probe for Floating condenser coontrol
-aauxiliary probe
Tab. 6.b
If the auxiliary
a
probe sellected, a high tem
mperature thresholld can be set (parrameter A16, A17). This alarm has automatic
a
reset, w
with a fixed differeential of 2°C.
Exampple of HT alarm m
management
Diff. 2°C
Alarm ON
N
Alarm OFF
Set Poinnt
temperature
Fig. 6.aa
Cod. CAREL
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μRack
6.6
Prevent high discharge pressure
This function is enabled by parameter /32.
In order to prevent the activation of the general high pressure switch (total shutdown of the compressors, with manual reset), a “prevention” function can be enabled by
setting a pre-alarm threshold; this function gradually decreases the capacity of the unit.
The high pressure prevention (Prevent HP) function is only enabled during the activation and deactivation of the compressors.
If the discharge pressure exceeds the threshold set (parameter /33), the activation of any compressors is disabled and a prevent alarm is generated. In addition, all the
compressor load steps are deactivated, observing the times set for parameter C06.
If the discharge pressure falls below the Prevent threshold, any other compressor start calls are ignored, for a set time called Prevent time 1 (parameter A13).
If between the start of two prevent cycles a time less than Prevent time 2 (parameter A14) elapses, the “Excessive prevent frequency” alarm is generated, A29.
The “Excessive prevent frequency” alarm (display only) is reset automatically, if, within Prevent time 3 (parameter A15), the prevent function is not activated again. This
alarm can be reset manually by the user, momentarily disabling the PREVENT function, using parameter /32.
OutPress
STPpr
T[s]
ALPrv
T[s]
Dprev2
NCmp
4
3
2
1
T1
Dprev1
T[s]
Fig. 6.b
Key:
OutPress
Discharge pressure
T
Time
NCmp
Number of suction steps required
ALPrv
High pressure prevention alarm
STPpr
Prevent HP activation threshold
T1
Time between compressor stops with prevent HP active
Dprev1
Step activation delay after end prevent HP (prevent time 1)
Dprev2
Minimum time for activation of high prevent frequency alarm (prevent time 2)
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
23
μRack
7
Alarm mannagement
The acctivation of an alarrm, from digital innput, causes the direct action on thee devices involvedd, at the same time activating: the LLED and a signal on
o the display. If thhe
comprressors are called, the activation of an
a alarm on one compressor sendss the call to anothher compressor.
The alaarm information aappears is displayeed alternating with the value read bby the control proobe. If more than one
o alarm is active
ve, the informationn appears on the display
d
in sequuence. If the alarm
m situation is resoolved, the relay is reset
r
and the alarm
m message is canncelled. In the casee of alarms with m
manual reset, the Reset Alarms paraameter
(A19) needs to be accesssed.
The alaarm from digital innput is typically detected when the contact “opens”, however the logic can be selected using the “digital input logic” parameter, /14.
7.1
Alarms w
with autom
matic reset
When one or more autoomatic reset alarm
ms are detected, thhese are signalled by:
• Red ALARM LEED on;
• Alarm relay chaanges, if enabled.
Press the
t PRG/MUTE buutton.
If the cause
c
of the alarm
ms is resolved, the devices that havee shutdown will reestart normal operation, and the staatus of the signal ddevices changes as
a follows:
• The alarm relayy changes to norm
mal status;
• Red ALARM LEED goes off..
If, in thhis situation, new alarms are activatted, the initial situation will return.
The siggnal will remain active to leave a siggn of alarm ON, until
u the operator manually sets thee reset alarms paraameter A19.
7.2
Alarms w
with manua
al reset
The coompressor thermaal overload (param
meter /29) fan theermal overload (paarameter /30) alaarms can be set ass manual reset.
When one or more mannual reset alarms are detected, thesse are signalled byy:
• Red ALARM LEED on;
• Alarm relay chaanges, if enabled.
If the cause
c
of the alarm
ms has been resoolved, the red LED
D stays on to info rm the user that alarms have been
n activated duringg the day. In this situation, the alarrm relay
remainns in an alarm conndition and the deevices remain disaabled until the useer deleted the alarrm messages usin
ng parameter A199.
If, in thhis situation, new alarms are activatted, the initial situation will return..
If the causes
c
no longer eexist, the status off the signal devicees changes as folloows:
• The alarm relayy changes to norm
mal status;
• Red ALARM LEED goes off..
If, on the
t other hand, thhe cause of the alaarms is still presennt, the initial situattion will return.
7.3
Semiauto
omatic alarrms
The low pressure alarm
m from transducerr is a semiautomaatic alarm. It acts as an alarm with automatic reset, however if it is aactivated at least 3 times within a set
s time
(defauult 10 minutes), it becomes an alarm
m that must be reset manually, thatt is, using parameeter A19. This alarm obviously causees the unit to shutdown.
7.4
Alarm relay
Based on the configurattion (no. of devicees < 5) relay no. 5 (multifunction) ccan be used as ann alarm relay.
A delayy time can be set (parameter A20) between the activvation of an alarm
m and the change in the status of th
he signal relay.
If the time
t
is set to 0, the activation of thee alarm relay is im
mmediate.
Code
A01
Alarm descriptionn
Compressor 1
Generated by
b
DIN
Action pperformed
Com p.1 OFF
Type of reset
Settable
Delay
Settable
A02
A03
Compressor 2
DIN
Com p.2 OFF
Settable
Settable
Compressor 3
DIN
Com p.3 OFF
Settable
Settable
A04
Compressor 4
DIN
Com p.4 OFF
Settable
Settable
A05
Compressor 1 maaintenance
---
/
Settable
no
A06
Compressor 2 maaintenance
---
/
Settable
no
A07
Compressor 3 maaintenance
---
/
Settable
no
A08
Compressor 4 maaintenance
---
/
Settable
no
A09
Liquid level (from m
multifunction input)
DIN
/
manual
settable
A10
General suction pressure switch 1
(from multifunctioon input)
DIN
COMP O
OFF CIRC 1
automatic
no
A11
General suction pressure switch 2
(from multifunctioon input)
DIN
COMP O
OFF CIRC 2
automatic
no
A12
General dischargee pressure switch
(from multifunctioon input)
DIN
All com
mps. OFF
Settable
no
A13
Low discharge preessure
AIN
All faans OFF
automatic
settable
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
24
Notes
μRack
Code
Alarm description
Generated by
Action performed
Type of reset
Delay
A14
High discharge pressure
AIN
All fans ON
automatic
no
Notes
A15
Low suction pressure 1
AIN
All comps. OFF
automatic
settable
A16
High suction pressure 1
AIN
all comps. ON
automatic
settable
A17
Low suction pressure 2
AIN
All comps. OFF
automatic
settable
A18
High suction pressure 2
AIN
all comps. ON
automatic
settable
A19
Suction probe 1 faulty or disconnected
AIN
Settable no. comps. ON
automatic
30 seconds
See compressor management with probe
broken.
A20
Suction probe 2 faulty or disconnected
AIN
Settable no. comps. ON
automatic
30 seconds
See compressor management with probe
broken.
A21
Discharge probe faulty or disconnected
AIN
Settable no. fans ON
automatic
30 seconds
Force fan inverter to 100%.
A22
Fan 1 thermal overload
DIN
Fan 1 OFF
Settable
no
A23
Fan 2 thermal overload
DIN
Fan 2 OFF
Settable
no
A24
Fan 3 thermal overload
DIN
Fan 3 OFF
Settable
no
A25
Fan 4 thermal overload
DIN
Fan 4 OFF
Settable
no
A26
General fan thermal overload
DIN
Only signal alarm. Preset
electronically the fan stop
during overload
Automatic
no
A27
Prevent high discharge pressure
AIN
Compressors OFF
Automatic
no
A28
Compressors off for Prevent HP
AIN
Compressors OFF
Automatic
no
A29
Excessive prevent frequency
AIN
/
Settable
no
HtE
High outside temperature
AIN
Automatic
No
HtA
High ambient temperature
AIN
Automatic
No
EHS
High supply voltage
---
OFF
Automatic
No
ELS
Low supply voltage
---
---
Automatic
No
EPb
EEPROM error
---
---
Settable
No
EL1
Zero cross
Power supply
voltage
100% Fans
Automatic
No
AB2
B2 probe error faulty or disconnected
AIN
---
Automatic
No
AB3
B3 probe error faulty or disconnected
AIN
---
Automatic
No
Display only
Tab. 7.a
7.5
Alarms from analogue inputs: temperature probe and pressure transducer:
Fixed differentials:
0.2 bar suction
1.0 bar discharge
Example of LP alarm management
Diff.
Alarm on
Alarm off
Low press.
Set Point
Fig. 7.a
Diff.Example of HP alarm management
Alarm on
Alarm off
Set Point
High press.
Fig. 7.b
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
25
μRack
8
The supervvisor netwoork
µRack can be connectedd to the most com
mmon supervisoryy systems, using suuitable interface boards
b
and protocols.
In partticular, the following data is exchanged with the supeervisor:
•
The status of the inputs /outpputs
•
The status of the devices enabbled
•
Alarms preseent and active
•
Enabling of tthe devices, various settings etc.
In adddition, this functionn allows the posssibility to modify a series of param eters from the suupervisor, such as: set point, differeentials, times, unitt status, reset alarrms etc.
Also seee the paragraph Supervisor comm
munication variablees.
8.1
Serial bo
oards
For connection to superrvisory systems, thhe control uses thee standard CARELL RS485 serial protocol.
Serial connection
c
optionns:
Product code
MRK00000000
RS485 serial option Code
MCH20048850
Notes
External opttion connected byy cable to µRack co
ompact
MRK000000D0
FCSER000000
Serial outpuut board for DIN version,
v
to be fitted in the instrumennt
MRK00000AD0
-----------------
µRack with sserial option FCSEER00000 already FITTED
F
by CAREL
T 8.a
Tab.
8.2
Commun
nication pro
otocols
Comm
munication protocool: CAREL.
To enaable the correct opperation of the coommunication prootocol, as well as i nstalling the boarrd, a number of paarameters need too be set, such as the
t identification number
n
(param
meter /36).
Each controller must have the address seet so that:
•
There are NO
O other devices with
w the same adddress on the samee serial line
•
The addressses on the same seerial line must be set in progressivee order, starting frrom 1.
For furrther information, refer to the correesponding manual or contact CARELL.
9
User interfface
The paarameters are divided into 2 categoories.
Displayy information thatt is NOT passworrd-protected: shoow the values of thhe probes, alarmss.
Displayy information thatt is password-prootected:
1.
1
2.
2
3.
3
USER param
meters (password 22 modifiable by parameter /40): sset the main functtions of the devicees connected (tim
mes, set points, diffferentials);
INSTALLER parameters (passsword 44 modifiabble by parameter //41): periodical checks on the deviices, calibration off the probes connnected, manual opperation
of the devicees.
MANUFACTTURER parameterrs (password 77 modifiable
m
by paraameter /42): configure the compressor rack, enable the main functionns and select the devices
connected.
Once the
t password is eentered, it remainss in the memory until automaticallyy returning to thee main screen, so as to make it eassier to move around within the sam
me level
of prottection.
IMPORRTANT:
To chaange the level of pparameter protection from the keyppad (from the MAANUFACTURER levvel only), proceed as follows:
1.
1
Once havingg entered the corrrect PWD MANUFA
ACTURER, the sysstem displays the string “S-P” (Set Parameters);
P
2.
2
Then either press “SEL”, direectly accessing thhe parameter meenu to change the values or press “DOWN” or “UUP” to display off the string “L-P” (LevelParameters).
3.
3
If modifyingg the level, pressing “SEL” accesses the parameter menu as describeed, where parameters are scrolledd no longer displaayed with the asssociated
value, but raather the level of protection.
p
4.
4
Using the saame procedure as for modifying thee parameters, cha nge the level, chooosing between th
he 3 possible levells available:
“_U_”” :parameters visibble at User level,
“_I_” :parameters visibble at Installer leveel,
“_C_”” :parameters visibble at Manufacturer level.
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
26
μRack
10 List of par ameters
This tabble contains the list oof all the parameterrs, with the correspoonding description.
Parameeter: description;
Type: (R)
( read-only, (R/W)) read/write;
Pos.: poosition: USER-INSTAALLER-MANUFACTURER;
Descripption: synthetic desccription of the param
meter;
UOM: unit
u of measure of tthe value in questionn;
Range: range of possible vvalues for the param
meter;
Defaultt: factory-set value oof the parameter.
Notes: column available foor user notes.
IMPORRTANT: Not all thhe screens listedd below will be displayed when s crolling the display; enabling a certain
c
type of coonfiguration will mean that new screens
s
are dissplayed that werre previously nott available. The display
d
therefore depends on thee initial configuration!
USER PARAMETERS
Press the SEL buttton for at least 5 secs
PW
P 22
INSTAALLER
PARAM
METERS
Press the button PRG per at least 5 secs
PW
P 44
Press the P RG + SEL button together for moree than 5 seconds
MANU
UFACTURER
PARAM
METERS
+
THIS PASSW
WORD OFFERS TH
HE POSSIBILITY OF
O DISPLAYING ALLL
THE PARAM
METERS FOR PROGRAMMING THE UNIT AND
CHANGING
G THE LEVEL OF PROTECTION:
P
PW
P 77
Taab. 10.a
Structuure of the param
meters:
Maiin synoptic chart:
Password
LP1
LP2
HP
S2
S3
““S-P” and “L-P”
parameters
-/-C-r-A-M-
“L-P”
visibility
“S-P"= SSet Parameters
“L-P”= LLevel Parameterss
Pressinng “PRG” for 3 seconds returns to the main synoptiic.
Fig. 10.a
Table of parameterss
Parameeter
Type Pos. Display
D
Descriptioon
UOM
Range
Default
0 to 2
0
Configuration menu
Type of unit
R/W
C
/00
Set the type of unit, LT, MT or two circuit
0) LT
1) MT
2) TWO CIRCUIT
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
27
Nottes
μRack
Parameter
Unit model
Compressors with different
capacities
Type Pos. Display Description
Set the unit model (without capacity control):
SINGLE CIRCUIT
0) 0 compressors
1) 1compressor
2) 2 compressors
3) 3 compressors
4) 4 compressors
TWO CIRCUIT
5) 1 compressor + 1 compressor
6) 2 compressors + 1 compressor
R/W C
/01 7) 3 compressors + 1 compressor
8) 2 compressors + 2 compressors
Set the unit model (with capacity control):
SINGLE CIRCUIT
9) 1 compressor 1 capacity control
10) 1compressor 2 capacity control
11) 1 compressor 3 capacity control
TWO CIRCUIT
12) 1 compressor 1 capacity control + 1 compressor
13) 1 compressor 1 capacity control + 1 compressor 1 capacity control
14) 1 compressor 2 capacity control + 1 compressor
Enable management of compressors with different capacities
R/W C
/02 0) NOT ENABLED
1) ENABLED
UOM
Range
Default
0… 14
2
0/1
0
Notes
For single circuit only for
the configuration
/01=1,2,3 e 4
Only if comp. with
different capacities are
enabled
Only if comp. with
different capacities are
enabled
Only if comp. with
different capacities are
enabled
Only if comp. with
different capacities are
enabled
Capacity compressor 1
R/W
C
/03
Capacity of compressor 1
kW
0 to 999
5
Capacity compressor 2
R/W
C
/04
Capacity of compressor 2
kW
/03 to 999
10
Capacity compressor 3
R/W
C
/05
Capacity of compressor 3
kW
/03+/04 to 999
20
Capacity compressor 4
R/W
C
/06
Capacity of compressor 4
kW
/03+/04+/05 to
999
40
Number of compressors ON
with suction probe 1 fault
R/W
C
/07
0 to 4
0
Number limited by the
number of compressors
Number of compressors ON
with suction probe 2 fault
R/W
C
/08
0…2
0
For two circuits only
Configure number of fans
R/W
C
/09
Set the number of fans
0 to 4
2
Number limited by the
number of compressors
already enabled
Enable fan inverter
R/W
C
/10
Enable control of the fans with inverter
0/1
0
R
U
/11
Display the inverter output as a percentage
0 to 100%
0
R/W
C
/12
If the discharge probe fault or not connected alarm is activated, this number
of fans are started. These are in any case managed by the individual alarms
and general pressure switches..
0 to 4
0
Enable fans with compressors
R/W
ON
C
/13
0= independent operation of the fans
1= fans on only when at least one compressor is ON
0/1
0
Digital input logic: N.O. =No
alarm
C
/14
0/1
1
NO / NC
0
If the 4 outputs are
used, this parameter is
ignored and the
Multifunction Input is
set as fan thermal
overload
Display inverter output value
Number of fans ON with
probe fault:
R/W
Multifunction input
configuration
R/W
C
/15
B1 probe type
R/W
C
/16
MIN suction pressure
R/W
C
/17
If the suction 1 probe fault or not connected alarm is activated, this number
of compressors are started. These are in any case managed by the individual
alarms and general pressure switches.
If the suction 2 probe fault or not connected alarm is activated, this number
of compressors are started. These are in any case managed by the individual
alarms and general pressure switches.
Set the logic of the digital inputs.
0) N.O.: with no alarm the contact is open
1) N.C. : with no alarm the contact is closed
Set the type of multifunction input:
0: no function
1) unit ON-OFF (NC contact ON)
2) change set point (set1- set2)
3) general high pressure switch NC
4) general high pressure switch NO
5) general low pressure switch 1 NC
6) general low pressure switch 1 NO
7) general low pressure switch 2 NC
8) general low pressure switch 2 NO
9) liquid level alarm NC
10) liquid level alarm NO
11) general fan thermal overload NC
12) general fan thermal overload NO
B1 probe set:
0) probe not connected
1) NTC probe
2) 0 to 5 V probe
Set the minimum value of suction probe
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
28
0 to 12
bar
0 to 2
2
-1.0 to /19
-1.0
μRack
Parameter
MIN discharge/suction 2
pressure
MAX suction pressure
MAX discharge/suction 2
pressure
Type Pos. Display Description
UOM
Range
Default
R/W
C
/18
Set the minimum value of discharge probe/suction probe of second circuit
bar
-1.0 to /20
0
R/W
C
/19
bar
/17 to 45.0
9.3
R/W
C
/20
bar
/18 to 45.0
34.5
B2 probe type
R/W
C
/21
0 to 2
0
B3 probe type
R/W
C
/22
0 to 2
0
B4 probe calibration (suction) R/W
I
/23
Set the maximum value of the suction probe
Set the maximum value of the discharge probe/suction probe of second
circuit
B2 probe set:
0) probe not connected
1) ambient air temp. probe / for two circuit, condenser probe
2) auxiliary temperature probe (used for HT alarm)
B3 probe set:
0) probe not connected
1) outside air temp. probe
2) auxiliary temperature probe (used for HT alarm)
Suction probe calibration
bar
-12 to 12
0
I
/24
Discharge probe calibration
bar
-12 to 12
0
B1 Probe calibration
(discharge)
B2 probe calibration
R/W
R/W
I
/25
Room probe calibration
°C
-12 to 12
0
B3 probe calibration
R/W
I
/26
°C
-12 to 12
0
Display probe
R/W
U
/27
0 to 3
3
Alarm relay logic
R/W
C
/28
0/1
1
Type of compressor thermal
overload alarm reset
R/W
C
/29
0/1
1
Type of fan thermal overload
alarm reset
R/W
C
/30
0/1
1
Type of general discharge
pressure switch reset
R/W
C
/31
Outside probe calibration
Probe displayed as default
0) probe B1
1) probe B2
2) probe B3
3) probe B4
Logic of the alarm relay
0) NC
1) NO
Type of thermal overload/generic alarm reset relating to the individual
compressor. Automatic: when the alarm stops, the compressor starts again.
Displayed only if the parameters are enabled
0) AUTO
1) MANUAL
Type of thermal overload/generic alarm reset relating to the individual fan.
Automatic: when the alarm stops, the fan starts again. Displayed only if the
parameters are enabled
0) AUTO
1) MANUAL
Type of general high pressure switch reset
0) AUTO
1) MANUAL
0/1
0
Prevent high discharge
pressure
R/W
C
/32
Enable high discharge pressure prevention
0/1
0
Set point
R/W
C
/33
High discharge pressure prevention set point
0 to 45.0
18.0
0 to 11
3
1 to 200
1
0 to 999
0
0/1
1
0/1
1
0 to 999
22
bar
Refrigerant conversion
R/W
C
/35
Type of refrigerant used
0) No refrigerant
1) R22
2) R134a
3) R404a
4) R407c
5) R410a
6) R507
7) R290
8) R600
9) R600a
10) R717
11) R744
Serial address
R/W
C
/36
Supervisor configuration. Identification number of the µRack board for the
supervisor serial network
Delay restart after black out
R/W
I
/37
Unit ON/OFF from the
supervisor
R/W
I
/38
Unit ON/OFF by parameter
R/W
U
/39
New User password
R/W
U
/40
New Installer password
R/W
I
/41
Used to change the password to access the Installer branch
0 to 999
44
New Manufacturer password
R/W
C
/42
0 to 999
77
B4 probe type
R/W
C
/43
Used to change the password to access the Manufacturer branch
B4 probe set:
0) probe not connected
1)0 to 5 V probe
2) 0 to 5 V probe
0 to 2
2
Enable delay at start-up after a black out, with the set time. If 0 no delay
Enable/disable unit from the supervisor.
0) OFF
1) ON
Enable/disable unit by parameter
0) OFF
1) ON
Used to change the password to access the User branch
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
29
s
Notes
If alarm relay enabled
If prevent enabled
μRack
Parameter
Type Pos. Display Description
UOM
Range
Default
Notes
Compressor menu
Min. compressor ON time
R/W
C
C01
Minimum ON time for same compressor
s
0 to 999
10
Min. compressor OFF time
R/W
C
C02
Minimum OFF time for same compressor
s
0 to 999
120
Min. time between starts of
different compressors
R/W
C
C03
Minimum time between two start calls for different compressors. Avoids
simultaneous starts
s
0 to 999
30
Min. time between stops of
different compressors
R/W
C
C04
Minimum time between two stop calls for compressors
s
0 to 999
10
Min. time between starts of
same compressor
R/W
C
C05
Minimum time between two effective starts of the same compressor
s
0 to 999
360
Time between compressor
OFF call with prevent active
R/W
C
C06
Time between compressor stop call with high pressure prevention active
s
0 to 999
30
R/W
I
C07
Compressor operating hour threshold for maintenance alarm. If set to 0, no
maintenance alarms.
h x 100
0 to 320
0
R
I
C08
h x 100
0 to 320
0
R/W
I
C09
0/1
0
R
I
C10
0 to 320
0
R/W
I
C11
0/1
0
R
I
C12
0 to 320
0
R/W
I
C13
0/1
0
R
I
C14
0 to 320
0
R/W
I
C15
Display compressor 1 operating hours
Reset compressor 1 operating hours
0) NO RESET
1) RESET
Display compressor 2 operating hours
Reset compressor 2 operating hours
0) NO RESET
1) RESET
Display compressor 3 operating hours
Reset compressor 3 operating hours
0) NO RESET
1) RESET
Display compressor 4 operating hours
Reset compressor 4 operating hours
0) NO RESET
1) RESET
0/1
0
Compressor set point circuit 1 R/W
U
r01
Compressor set point first circuit
bar / °C
r12 to r13
1.0
Compressor differential circuit
R/W
1
U
r02
Compressor differential first circuit
bar /°C
0 to 20.0
0.5
Compressor set point circuit 2 R/W
U
r03
Compressor set point second circuit
bar / °C
r14 to r15
1.0
For two circuits only
Compressor differential circuit
R/W
2
U
r04
Compressor differential second circuit
bar /°C
0 to 20.0
0.5
For two circuits only
Compressor rotation
C
r05
Type of compressor rotation
0 = No rotation
1 = FIFO
2 = Time
1
For single circuit only
0/2
1
Compressor operating hour
threshold for maintenance
alarm
Compressor 1 operating hours
RESET Compressor 1
operating hours
Compressor 2 operating hours
RESET Compressor 2
operating hours
Compressor 3 operating hours
RESET Compressor 3
operating hours
Compressor 4 operating hours
RESET Compressor 4
operating hours
h x 100
h x 100
h x 100
Only if
prevent active
Control menu
R/W
R/W
C
r06
Type of compressor control:
0) Proportional
1) Dead band
2) Dead band with time
R/W
I
r07
Set minimum call time for compressor starts in dead band
s
C03 to r08
20
R/W
I
r08
Set maximum call time for compressor starts in dead band
s
r07 to 999
60
R/W
I
r09
Set minimum call time for compressor stops in dead band
s
0 to r10
10
R/W
I
r10
Set maximum call time for compressor stops in dead band
s
0 to 999
60
Dead band differential
pressure in which the time
varies
R/W
I
r11
Pressure differential in which the compressor start/stop time is proportional
to the suction pressure
bar
/17…20,0
0.5
Min compressor set point
R/W
C
r12
Set the lower limit of the compressor set point circuit 1
bar
/17 to r13
0.1
Max compressor set point
Min compressor set point
circuit 2
Max compressor set point
circuit 2
R/W
C
r13
Set the upper limit of the compressor set point circuit 1
bar
r12 to /19
9.3
R/W
C
r14
Set the lower limit of the compressor set point circuit 2
bar
/18 to r15
0.1
For two circuits only
R/W
C
r15
Set the upper limit of the compressor set point circuit 2
bar
r14 to /20
10
For two circuits only
Fan set point
R/W
U
r16
Fan set point
bar
°C
r25 to r26
15.5
35.7
For single circuit only
Fan differential
R/W
U
r17
Fan differential
bar
°C
0 to 20.0
0 to 20.0
3
18
For single circuit only
Inverter set point
R/W
U
r18
Fan inverter set point
bar
°C
r25 to r26
15.5
35.7
Only if the inverter is
enabled
Compressor control
Min call time start in dead
band
Max call time start in dead
band
Min call time stop in dead
band
Max call time stop in dead
band
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
30
Only if dead band
control is enabled
Only if dead band
control is enabled
Only if dead band
control is enabled
Only if dead band
control is enabled
Only if dead band
control is enabled
μRack
Parameter
Type Pos. Display Description
Fan inverter differential
R/W
U
r19
Fan rotation
R/W
C
r20
Fan control
R/W
C
r21
Integral time (P+I only)
R/W
C
Time between fan start call
R/W
C
Time between fan stop call
R/W
Min fan set point
UOM
bar
°C
Fan inverter differential
Range
0 to 20.0
0 to 20.0
Default
3
18
Notes
Only if the inverter if
enabled
0/1
1
For single circuit only
0 to 2
0
For single circuit only
Only if PI
r22
Type of fan rotation.
0) NO ROTATION
1) FIFO
Type of fan control:
0) Proportional
1) Proportional + integral
2) Dead band
Integral time with P+I control
s
0 to 999
600
r23
Minimum time between two successive calls to start different fans
s
0 to 999
2
xx
C
r24
Minimum time between two successive calls to stop different fans
C
r25
Set the lower limit of the fan set point
Max fan set point
R/W
C
r26
Set the upper limit of the fan set point
0 to 999
0 to r26
-50 to r26
r25 to 40.0
r25 to 150
2
1.0
-31.2
25.0
55.3
xx
R/W
s
bar
°C
bar
°C
Fan inverter speedup time
R/W
C
r27
Fan inverter speedup time
s
0 to 999
2
Inverter ramp up time
R/W
I
r28
Set the time taken by the inverter to reach full load
s
0 to 999
10
Minimum fan inverter output
R/W
C
r29
Set the minimum operation of the fan inverter
%
0 to r30
0
Maximum fan inverter output
R/W
C
r30
Set the maximum operation of the fan inverter
%
r29 to 100
100
Triac impulse duration
R/W
C
r31
Duration of the impulse applied to the triac
ms
0 to 10
0
Enable the floating condenser control
0) NO
1) YES
0 to 1
0
Enable floating condenser
control
R/W
C
r32
Condensing Delta T
R/W
C
r33
Temperature difference for floating condenser control
-40 to 150
10
-99.9 to 99.9
0
bar
A03 to /19
9.3
s
0 to 999
60
bar
/17 to A01
0
s
0 to 999
60
bar
A07… /20
9.3
s
0 to 999
60
Compressor management
offset set point
Alarm menu
R/W
I
r34
Compressor bar auxiliary set point offset.
Used when changing the set point from digital input
HP suction 1 alarm
R/W
I
A01
Suction probe 1 alarm: high threshold setting
HP suction 1 delay
R/W
I
A02
Suction probe 1 alarm: delay setting
LP suction 1 alarm
R/W
I
A03
Suction probe 1 alarm: low threshold setting
LP suction 1 delay
R/W
I
A04
Suction probe alarm: delay setting
HP suction 2 alarm
R/W
I
A05
Suction probe 2 alarm: high threshold setting
HP suction 2 delay
R/W
I
A06
Suction probe 2 alarm: delay setting
LP suction 2 alarm
R/W
I
A07
Suction probe 2 alarm: low threshold setting
bar
/18 to A05
0
LP suction 2 delay
R/W
I
A08
Suction probe alarm: delay setting
HP discharge alarm
R/W
I
A09
Discharge probe alarm: high threshold setting
LP discharge alarm
R/W
I
A10
Discharge probe alarm: low threshold setting
Discharge delay
R/W
I
A11
Discharge probe alarm: delay setting
s
bar
°C
bar
°C
s
0 to 999
A10 to /20
A10 to 150
/18 to A09
-50 to A09
0 to 999
60
20.0
45.8
0
-50
60
Compressor thermal delay
HP prevention
Prevent time 1
HP prevention
Prevent time 2
HP prevention
Prevent time 3
High temp. probe threshold:
B2
High temp. probe threshold:
B3
Delay liquid level alarm
R/W
I
A12
Compressor thermal overload alarm: delay setting
s
0 to 999
0
R/W
I
A13
Time in which start calls are ignored after prevent HP
m
0 to 99
5
R/W
I
A14
m
0 to 999
6
R/W
I
A15
m
0 to 99
30
R/W
I
A16
High temperature threshold, probe B2
°C
-40 to 150
100
R/W
I
A17
High temperature threshold, probe B3
°C
-40 to 150
100
R/W
I
A18
m
0 to 500
60
Reset ALARMS
R/W
U
A19
0/1
0
Alarm signal delay
R/W
I
A20
Set the liquid level alarm delay from multifunction input
Reset the alarms with manual reset
0) NO RESET
1) RESET
Set alarm signal delay
s
0 to 999
1
Exchange auto->man LP 3
alarms
R/W
I
A21
On the 3rd activation, within the set time, the low pressure alarm from
pressure switch changes from automatic to manual reset.
m
0 to 999
10
OFF due to probe
disconnected
R/W
I
A22
Enable unit OFF due to probe disconnected/alarm
0) NO
1) YES
0/1
0
If two prevent alarms occur within this time, an excessive prevent frequency
alarm is generated
If no prevent alarms occur in this period, the high prevent frequency alarm is
automatically reset
Maintenance menu
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
31
Only if the inverter is
enabled
Only if the inverter is
enabled
Only if the inverter is
enabled
Only if the inverter is
enabled
Only if the inverter is
enabled
For two circuits only
For two circuits only
Only if the prevent is
enabled
Only if the prevent is
enabled
Only if the prevent is
enabled
μRack
Parameeter
Enable compressor 1
Enable compressor 2
Enable compressor 3
Enable compressor 4
Force compressor
c
1
Force compressor
c
2
Force compressor
c
3
Force compressor
c
4
Enable fan 1
Enable fan 2
Enable fan 3
Enable fan 4
Force fan
f 1
Force fan
f 2
Force fan
f 3
Force fan
f 4
Force inverter
Type Pos. Display
D
Descriptioon
m
Enable opeeration of compresssor 1 in automatic mode:
R/W I
M01 0) NO
1) YES
m
Enable opeeration of compresssor 2 in automatic mode:
R/W I
M02 0) NO
1) YES
m
Enable opeeration of compresssor 3 in automatic mode:
R/W I
M03 0) NO
1) YES
Enable opeeration of compresssor 4 in automatic mode:
m
R/W I
M04 0) NO
1) YES
o
compressor 1
Manually operate
R/W I
M05 0) NO
1) YES
Manually operate
o
compressor 2
R/W I
M06 0) NO
1) YES
o
compressor 3
Manually operate
R/W I
M07 0) NO
1) YES
o
compressor 4
Manually operate
R/W I
M08 0) NO
1) YES
Enable opeeration of fan 1 in auutomatic mode:
R/W I
M09 0) NO
1) YES
Enable opeeration of fan 2 in auutomatic mode:
R/W I
M10 0) NO
1) YES
Enable opeeration of fan 3 in auutomatic mode:
R/W I
M11 0) NO
1) YES
Enable opeeration of fan 4 in auutomatic mode:
R/W I
M12 0) NO
1) YES
o
fan 1
Manually operate
R/W I
M13 0) NO
1) YES
o
fan 2
Manually operate
R/W I
M14 0) NO
1) YES
o
fan 3
Manually operate
R/W I
M15 0) NO
1) YES
Manually operate
o
fan 4
R/W I
M16 0) NO
1) YES
o
the inverter at 100%
Manually operate
R/W I
M17 0) NO
1) YES
UOM
Range
Default
0/1
1
0/1
1
0/1
1
0/1
1
0/1
0
0/1
0
0/1
0
0/1
0
0/1
1
0/1
1
0/1
1
0/1
1
0/1
0
0/1
0
0/1
0
0/1
0
0/1
0
Nottes
Only if thee inverter
is disaabled
Tab. 10.b
11 ON/OFF faan control board (codde CONVO
ONOFF0)
The CO
ONVONOFF0 modules allow the ON/OFF
O
control of the condenser faans.
The coontrol relay has a sswitching power 10A
1 at 250 Vac in AC1 (1/3 HP induuctive).
Fig. 11.a
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
32
μRack
12 PWM to 0 to 10 Vdc (or 4 to 200 mA) convversion board for fans (code CO
ONV0/10A00)
The CO
ONV0/10A0 moduules convert the PWM
P
signal sent frrom terminal Y onn the µRack to a sttandard 0 to 10 Vdc (or 4 to 20 mAA) signal.
The FC
CS series three-phase controllers can be connected too the µRack withoout requiring this module.
m
Fig. 122.a
13 Programm
ming key (coode PSOPZZKEYA0)
The prrogramming keys PSOPZKEY00 andd PSOPZKEYA0 forr CAREL controllerrs are used to coppy the complete seet of parameters tto the µRack.
The keeys must be conneected to the connector (4 pin AMP)) on the controllerrs, and can operatte when the instru
uments are eitherr on or off, according to the instructtions
for thee specific controlleer.
There are two main functions, which are selected using thee two dipswitchess (located under thhe battery cover). These are:
• Loadd the parameters ffrom a controller to
t the key (UPLOA
AD);
• Copyy from the key to oone or more conttrollers (DOWNLO
OAD).
Warning: The parameteers can only be coopied only betweeen instruments witth the same produuct code. The uplo
oad operation, onn the other hand, is always possiblee. To
assist the
t identification oof the key to be used, CAREL has applied a label thatt can used to desccribe the program
mming made or thhe unit that the data refers to.
IMPORRTANT NOTE: Thhe key can only be
b used on µRacck controllers thaat have the samee firmware version.
Refer to the programm
ming key instruction sheet for furrther details.
Fig. 13.a
14 Supervisorr managem
ment
The coontroller can be coonnected to a locaal or remote supervisor/telemaintennance system for managing the unit.
The vaariables sent and rreceived by the suupervisor are show
wn in the tables beelow, with referennce to the followin
ng key:
R
Read
Seend from the µRacck to the supervisoor. Not modifiablee
R/W
Read- Writee
Reeceived and sent from the µRack to the supervisor. Can
C be modified by the supervisor.
Analoggue variables
Flow
F
Inndex
R
R
R
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
R/W
R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Descriptiion
LP1
HP/LP22
B2
B3
r01
r02
r03
r04
r12
r13
r14
r15
r16 (barr)
r16 (°C))
r17 (barr)
r17 (°C))
B
Probe B4
B
Probe B1
B (ambient air)
Probe B2
B (outside air )
Probe B3
Suction set point circuit 1
Differenntial circuit 1
Suction set point circuit 2
Differenntial circuit 2
Min sucction set point 1
Max sucction set point 1
Min sucction set point 2
Max sucction set point 2
Fan set point
Fan set point
Fan diffferential
Fan diffferential
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
Display coode
33
μRack
Flow
Index
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
Description
Display code
r25 (bar)
r25 (°C)
r26 (bar)
r26 (°C)
r18 (bar)
r18 (°C)
r19 (bar)
r19 (°C)
A01
A03
A05
A07
A09 (bar)
A09 (°C)
A10 (bar)
A10 (°C)
/23
/24
/25
/26
/17
/18
/19
/20
/33
r34
r11
r33
A16
A17
Tab. 14.a
Min fan set point
Min fan set point
Max fan set point
Max fan set point
Fan inverter set point
Fan inverter set point
Fan inverter differential
Fan inverter differential
HP suction 1 alarm threshold
LP suction 1 alarm threshold
HP suction 2 alarm threshold
LP suction 2 alarm threshold
HP discharge alarm threshold
HP discharge alarm threshold
LP discharge alarm threshold
LP discharge alarm threshold
Probe B4 calibration
Probe B1 calibration
Probe B2 calibration
Probe B3 calibration
Min value suction probe
Min value discharge probe
Max value suction probe
Max value discharge probe
Set point prevent high pressure function
Set point offset to change set from DI
Differential pressure for dead band by time
Condensing temperature delta for floating control
High temp threshold probe B2
High temp threshold probe B3
Digital variables
Flow
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Index
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Description
Unit on
Status of compressor 1
Status of compressor 2
Status of compressor 3
Status of compressor 4
Status of fan 1
Status of fan 2
Status of fan 3
Status of fan 4
Status of digital input 1
Status of digital input 2
Status of digital input 3
Status of digital input 4
Status of digital input 5
Reset alarms
Digital input logic
Alarm relay logic
Enable fan inverter
ON/OFF from supervisor
Enable “prevent” control on condenser
Enable management of different compressors
Type of compressor reset
Type of fan reset
Type of reset for general high press. switch
Reset compressor 1 hours
Reset compressor 2 hours
Reset compressor 3 hours
Reset compressor 4 hours
Enable floating condenser control
Enable unit Off due to probe fault
Enable fans with compressor ON
Parameter
A19
/14
/28
/10
/38
/32
/02
/29
/30
/31
C09
C11
C13
C15
r32
A22
/13
Tab. 14.b
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
34
μRack
Alarms sent to the supervisor
Flow
R
R
R
R
R
R
R
R
R
Index
1
2
3
4
5
6
7
8
9
R
10
R
11
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Description
Alarm: compressor 1
Alarm: compressor 2
Alarm: compressor 3
Alarm: compressor 4
Alarm: fan 1
Alarm: fan 2
Alarm: fan 3
Alarm: fan 4
Alarm: liquid level
Alarm: general low suction pressure 1
(from multifunction DI)
Alarm: general low suction pressure 2
(from multifunction DI)
Alarm: low discharge pressure
Alarm: high discharge pressure
Alarm: low suction pressure 1”
Alarm: high suction pressure 1
Alarm: low suction pressure 2
Alarm: high suction pressure 2 “
Probe B1 faulty or disconnected
Probe B2 faulty or disconnected
Probe B3 faulty or disconnected
Probe B4 faulty or disconnected
Compressor 1 maintenance
Compressor 2 maintenance
Compressor 3 maintenance
Compressor 4 maintenance
General discharge pressure switch (from multifunction DI)
General fan thermal overload
Prevent high discharge pressure
Compressors off due to prevent
Excessive prevent frequency
High outside temperature
High room temperature
Alarm code
A01
A02
A03
A04
A22
A23
A24
A25
A09
A10
A11
A13
A14
A15
A16
A17
A18
A20
AB2
AB3
A19
A05
A06
A07
A08
A12
A26
A27
A28
A29
HtE
HtA
Tab. 14.c
Integer variables
Flow
R/W
R/W
R
R/W
Index
1
2
3
4
R
5
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
R
R/W
R/W
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
Description
Type of unit “/00”
Unit model “/01”
Number of compressors
Number of fans “/09”
Unit status
Parameter
/00
/01
/09
0 = Unit ON
1 = OFF from alarm
2 = OFF from supervisor
3 = OFF from remote input
4 = OFF from parameter
5 = Manual operation
6 = Install default
7 = PREVENT IN PROGRESS
Minimum call time for compressor start (dead band)
Minimum call time for compressor stop (dead band)
Minimum compressor ON time
Minimum compressor OFF time
Minimum time between starts of different compressors
Minimum time between starts of the same compressor
Reserved
Reserved
Liquid level alarm delay
Reserved
Number of compressors on in circuit 1 with probe damaged
Number of compressors on in circuit 2 with probe damaged
Number of fans on with probe damaged
Firmware release
Type of refrigerant
Capacity of compressor 1
Capacity of compressor 2
Capacity of compressor 3
Capacity of compressor 4
Inverter readout % “
Multifunction DI configuration
B1 type probe
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
35
r07
r09
C01
C02
C03
C05
A18
/07
/08
/12
/35
/03
/04
/05
/06
/11
/15
/16
μRack
Floow
R//W
R//W
R//W
R//W
R//W
R//W
R
R
R
R
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R//W
R
R
Inddex
228
229
330
331
332
333
334
335
336
337
338
339
440
441
442
443
444
445
446
447
448
449
550
551
552
553
554
555
556
557
558
559
660
661
662
663
665
666
Descriptioon
B2 typee probe
B3 typee probe
Delay restart after black out
Min tim
me between two stoop calls for differennt compressors
Time beetween compressoor stop call with Preevent function
Operatiing hour threshold for maintenance
Compreessor 1 hours
Compreessor 2 hours
Compreessor 3 hours “
Compreessor 4 hours
Type off compressor rotation
Type off compressor contrrol
Maximuum call for compreessor starts in dead band by time
Maximuum call for compreessor stops in deadd band by time
Type off fan rotation
Type off fan control
Integrall time for P+I fan control
Time beetween 2 fans startts in dead band
Time beetween 2 fans stopps in dead band
Inverterr speed up time
Inverterr ramp up time
Minimuum inverter output %
Maximuum inverter outputt %
Triac im
mpulse duration
High suuction pressure 1 alarm delay
Low suction pressure 1 alarm delay
High suuction pressure 2 alarm delay
Low suction pressure 2 alarm delay
Low disscharge pressure alarm delay
Compreessor thermal overrload alarm delay
Preventt time in which no compressor starts are enabled
Preventt time in which thee activation signals tthe alarm
Time too reset prevent alarrm
Alarm signal
s
delay
Time too change low presssure alarm from auutomatic to manual
B4 typee probe
Capacitty percentage of first capacity-controllled compressor with configuration /001= 9,10,11,12,133 e 14
Capacitty percentage of seecond capacity-conttrolled compressorr without configuraation /01= 9,10,1 1,12,13 e 14
Parameterr
/21
/22
/37
C04
C06
C07
C08
C10
C12
C14
r05
r06
r08
r10
r20
r21
r22
r23
r24
r27
r28
r29
r30
r31
A02
A04
A06
A08
A11
A12
A13
A14
A15
A20
A21
/43
Tab. 14.d
15 Default coonfigurationns
Signnal
B1
B22
B33
B44
Type of analogue inputs
Description
Discharge pressure
p
probe
Ambient air temperature probbe
Outside air temperature probbe
Suction presssure probe
Analoguee input 1
Analoguee input 2
Analoguee input 3
Analoguee input 4
Taab. 15.a
Signnal
Y
Type of analoguue outputs
Description
Fan inverter
PWM anaalogue output
Tab. 15.b
Siggnal
ID
D1
ID
D2
ID
D3
ID
D4
ID
D5
Type of digittal inputs
Description
Comp. 1 th
hermal overload
Comp. 2 th
hermal overload
Fan 1 therm
mal overload
Fan 2 therm
mal overload
General high pressure switch
ch
N.C. digiital input no. 1
N.C. digiital input no. 2
N.C. digiital input no. 3
N.C. digiital input no. 4
N.C. digiital input no. 5
Taab. 15.c
Siggnal
NO
O1
NO
O2
NO
O3
NO
O4
NO
O5
Type of digital outputs
Normallyy open contact, reelay no. 1
Normallyy open contact, reelay no. 2
Normallyy open contact, reelay no. 3
Normallyy open contact, reelay no. 4
Normallyy open contact, reelay no. 5
Description
Compressor 1
Compressor 2
Fan 1
Fan 2
Generic alarm
a
Tab. 15.d
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
36
μRack
16 Glossary
Analoggue value: integer vaalue with minus signn and decimal pointt.
Buffer (memory): memoryy on the board usedd to save the defaultt values selected by CAREL for all the paarameters. Permanent memory, saves thhe values even when power is disconneected.
Buzzer: buzzer fitted on thhe external terminalss; this sounds in the event of alarms or the limits set for thee parameters are excceeded. The Built-inn terminals do not have a buzzer.
Digital value: value with oonly two states.
Differential: defines a presssure (or temperature) difference from the corresponding sset point.
Discharge: pressure or tem
mperature measuredd at the compressorr outlet. This is an annalogue value.
HP : High pressure
Integerr value: integer valuue without decimal point.
p
LP : Low
w pressure
Proporttional band: this deffines a temperature (or pressure) zone of
o a few degrees startting from the set point, inside which the system manages thee control devices.
Range: range of values avaailable for a parameter.
Step: defines an area of the proportional bandd (pressure or temperature) inside whicch a device is on, annd at the same time also defines the devvice on/off values.
Set point: defines a pressurre (or temperature) value
v
to be satisfied; the system activatess or deactivates the devices
d
so that the value measured reachhes the set point.
Suctionn: pressure or tempeerature measured at the compressor intake. This is an anal ogue value.
Uploadd: the operation useed to copy the appliccation software from
m the computer or pprogramming key to the µRack.
17 Technical specificatioon
“Grouup A” is defined inn the following speecifications as the grouping of the ffollowing outputs: compressor 1, co
ompressor 2, fan 1, fan 2, alarm.
Power supply
12-pin connector
Relays
Digital inputs ID1 to ID55, IDB4
Analoggue inputs
Fan ouutput
Front panel
p
index of prootection
Storage conditions
Operatting conditions
Degreee of pollution
Cat. off resist. to heat and fire
PTI of the insulating materials
Class and
a structure of thhe software
Period of electrical stresss across the insulaating parts
24 Vac, range –15%
% ~ +10%; 50/60 Hz
Maximum
M
current output: 3 W
Fuse to be fitted inn series with the power supply of the µRack: 315 mATT
Max
M current 2 A fo r each relay outpuut, extendable to 3 A for one outpuut
Max
M current at 2500 Vac:
EN60730: Resistivee: 3 A, Inductive: 2 A cos (j)= 0.4 600000 cycles
UL:
U Resistive 3 A, 1 FLA , 6 LRA cos (j)= 0.4 30000 cyccles
Minimum
M
interval between switching cycles (each relay): 12 s (the mannufacturer of the unit that the devicce is
built into must enssure the correct coonfiguration to resspond to this speccification)
Tyype of micro-switcching of the relayy: 1 C
Innsulation betweenn relays in group A:
A functional
Innsulation betweenn relays in group A and the very low
w voltage parts: reeinforced
Innsulation betweenn relays in group A and the signal reelay: primary
Innsulation betweenn the signal relay and
a the very low voltage
v
parts: reinnforced
Innsulation betweenn relays and the frront panel: reinforrced
Electrical standard:: voltage-free conttact
Closing
C
current to gground: 5 mA
Maximum
M
closing rresistance: 50 W
B1, B2, B3, B4: CARREL NTC temperaature probes (10 kW
k at 25 °C)
The response timee depends on the component used,, typical value 90 ssec.
B4: NTC temp. proobes (10 kW at 25 °C) or CAREL 0 to 5 V or free conttact ratiometric prressure probes
Control
C
signal for CCAREL MCHRTF*****, CONVONOFFF*, CONV0/10A* aand FCS modules.
Modulation
M
of imppulse position (sett amplitude) or modulation of the dduty-cycle. Refer too the user manuaal for
thhe configuration oof the parameters
Loadless voltage: 5 V ± 10%
Short-circuit currennt: 30 mA
Minimum
M
output looad: 1 kW
IPP55
-110T70°C - humidiity <80% r.H., nonn-condensing
-110T50°C - humidiity <90% r.H., nonn-condensing
Normal
N
D (UL94 V0)
≥250
≥
V
A
loong
Note: All
A the relays musst have the commons (C1/2, C3/4) connected togethher, as shown in Fig.
F 1e2
Functtional specificcations
Resoluution of analogue inputs
Tempeerature measurem
ment error
Pressure measurement error
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
Temperature
T
probbes: range -40T80°C, 0.1 °C
Range
R
-20T20 °C, ±0.5 °C (excludinng probe)
Range
R
-40T80 °C, ±1.5 °C (excludinng probe)
The
T voltage % errror in the input rannge of 0.5 to 4.5 Vdc
V is ± 2% (excluuding probe).
37
μRack
18 Product coodes list
MRK0000000: μRack ppanel mounting 322x74, 24 Vac, withh connectors kit
MRK00000D0: μRack D
DIN rail mountingg, 24 Vac, with connnectors kit
MRK0000AD0: μRack D
DIN rail mountingg, RS485 preinstalled serial board, 224 Vac, with conneectors kit
The coonnectors kit contaains:
Polarizzed mini-fit conneector 2x6 pin femaale
Polarizzed mini-fit conneector 2x7 pin femaale
removvable terminal righht angle female 3 pin, pitch= 3.81 mm,
m high= 11.1 m
mm
removvable terminal righht angle female 3 pin, pitch = 5.08 mm,
m high= 11.1 m
mm (DIN version only)
Accesssories
MCH22CON001: connecctors kit for μChilller2/μRack panel mounting versionn
MCH22CON011: connecctors kit for μChilller2/μRack DIN raail mounting versi on
Warning: the connectorrs kit MCH2CON** contains a 2 pinss connector for thee tLAN which is not used for μRackk
MCHSSMLCONM: mini-ffit 2x6 and 2x7 pin connectors kit
MCHSSMLCAB0: 24 cables kit 1 mm2, L= 1 m, preset for mini-fit
m
connection
MCHSSMLCAB2: 24 cables kit 1 mm2, L= 2 m, preset for mini-fit
m
connection
MCHSSMLCAB3: 24 cables kit 1 mm2, L= 3 m, preset for mini-fit
m
connection
MCH22004850: RS485 sserial board for peer μRack panel moounting version
FCSERR00000: RS485 seerial board for per μRack DIN rail mounting
m
version
PSOPZZKEY00: programming key with 12 Vdc batteries inclluded
PSOPZZKEYA0: program
mming key with 2330 Vac external power supply
KIT
code
uRack
Ratiometric ppressure probe
RS485
-1...4,2 bar
-1...9,3 bar
-1...12,8 bar
0...34,5 bar
Cables for
pressure
probe
Connectors kitt
2 m cables kit
MCHSMLCAAB2
MRK00010DK
MRK000200K
D
DIN
No
1
1
2
DIN
No
ppanel
No
1
1
2
panel
No
MRK00030DK
D
DIN
No
1
1
2
DIN
Yes
MRK000400K
ppanel
No
1
1
2
panel
Yes
MRK00050DK
D
DIN
No
1
1
2
DIN
Yes
MRK000600K
ppanel
No
1
1
2
panel
Yes
MRK00090DK
DIN
No
1
1
2
DIN
Yes
MRK000800K
ppanel
No
1
1
2
panel
Yes
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
38
μRack
19 Append
dix: Compressor rack
r
con troller, examples
e
s of appliication diagrams
d
s
4 com
mpressors un it with fan speeed regulator
C4 C3 C22 C1
Fig. 17.a
2 com
mpressors un it + 2 condenser fans
F2 F1 C22 C1
Fig. 17.b
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
39
μRack
3 compressors unit with 2 fan steps and speed regulator (no alarm relay output)
F1 C3 C2 C1
Fig. 17.c
2 compressors unit + 3 condenser fans
F2 F1 C2 C1
Fig. 17.d
Cod. CAREL +03P220431 rel. 2.3 dated 06/06/12
40
μRack
20 Append
dix: Chan
nges intrroduced iin Fw rellease 2.0
0 for MRK
K0000XX
X0
The lattest FW release haas changed from 1.7 to 2.0
Modifications have beenn made to the folllowing strings:
•
AS2 has beeen replaced by AB2;
•
AS3 has beeen replaced by AB3;
•
S3 has beeen replaced by B2;
•
S4 has beeen replaced by B3.
In the case of two refrigerant circuits, a fixxed delay of 4 secconds has been inntroduced between the start of the first
f compressor inn the first refrigeraant circuit and thee start
of the first compressor in the second refrigerant circuit.
The following “/” param
meters have been modified:
/15:
The default vallue has been channged from 3 to 0
/17:
The max. valuee is now /19
/18:
The max. valuee is now /20
/19:
The default vallue has been channged from 4.1 barrs to 9.3 bars
The max. valuee has been changeed from 40 bars to 45 bars
/20:
The max. valuee has been changeed from 40 bars to 45 bars
/29:
The default vallue has been channged from 1 to 0
/30:
The default vallue has been channged from 1 to 0
/33:
The max. valuee is now 45 bars
/34:
The parameterr has been made not
n visible
/43:
New parameteer for setting probee B4.
The SONDA__B4 parameter noow is visible and can
c be set on the display and from the supervisor.
Setting to 0 m
means the probe is not used.
Settings 1 annd 2 mean it usedd as a pressure proobe.
The following “C” param
meters have been modified:
C03: The default vallue has been channged from 20 sec to 30 sec
C04: The default vallue has been channged from 20 sec to 10 sec
C07:
C08:
C10:
C12:
C14:
The compress or maintenance hour threshold has
h been increassed:
The max. valuee has been changeed from 999 (houurs x 10) to 320 (hhours x 100)
The default vallue has been channged from 200 (hours x 10) to 0 (hhours x 100)
The max. valuee has been changeed from 999 (houurs x 10) to 320 (hhours x 100)
The max. valuee has been changeed from 999 (houurs x 10) to 320 (hhours x 100)
The max. valuee has been changeed from 999 (houurs x 10) to 320 (hhours x 100)
The max. valuee has been changeed from 999 (houurs x 10) to 320 (hhours x 100)
The following “r” param
meters have been modified:
r01:
The min. valuee is now r12
The max. valuee is now r13
r03:
The min. valuee is now r14
The max. valuee is now r15
r11:
The min. valuee has been changeed from 0 to /17 (min
(
value of sucttion probe B4) (m
min. value of setpo
oint1 = -1.0 bars)
r12:
The min. valuee has been changeed from 0 to /17 (min
(
value of sucttion probe B4) (m
min. value of setpo
oint1 = -1.0 bars)
r13:
The default vallue has been channged from 2.5 barrs to 9.3 bars
The max. valuee has been changeed from 40 bars to /19
The min. valuee has been changeed from 0 to /18 (min
(
value of probbe B1) (min. value of setpoint2 = -1.0 bars)
r14:
r15:
The max. valuee has been changeed from 40 bars to /20 (max. valuee of suction probee B1)
The default vallue has been channged from 2.5 barrs to 10 bars
r17:
The default vallue has been channged from 0.5 barrs (3°C) to 3 bars (18°C)
r19:
The default vallue has been channged from 0.5 barrs (3°C) to 3 bars (18°C)
r23:
The times for tthe fans in the deaad zone also apply to the proportioonal band (ZN onlly indication remo
oved)
r24:
The times for tthe fans in the deaad zone also apply to the proportioonal band (ZN onlly indication remo
oved)
r26:
The max. valuee has been changeed from 40 bars to /20 (max. valuee of suction probee B1)
The following “A” param
meters have been modified:
A01: The default vallue has been channged from 4 bars to 9.3 bars
The max. valuee has been changeed from 40 bars to /19 (max. valuee of suction probee B4)
A03: The default vallue has been channged from 0.5 barrs to 0 bars
A05: The default vallue has been channged from 4 bars to 9.3 bars
The max. valuee has been changeed from 40 bars to /20 (max. valuee of suction probee B1)
A07: The default vallue has been channged from 0.5 barrs to 0 bars
A09: The max. valuee has been changeed from 40 bars to /20
A10: The default vallue has been channged from 10 barss (20°C) to 0 barss (-50°C)
The min. valuee has been changeed from 0 bars (0°C) to /18 (-50°C)
C)
A18 haas been changed from seconds to minutes:
The default vallue has been channged from 90 sec to 60 min
The max. valuee has been changeed from 999 sec to
t 500 min
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
41
μRack
21 Append
dix: Chan
nges intrroduced iin Fw rellease 2.1
The lattest FW release haas changed from 2.0
2 to 2.1
Modifications have beenn made to the folllowing strings:
- arrannging of Speed-Upp Inverter mode and
a calculation off minimum and m
maximum speed inverter;
- arrannging of Floating ccondenser controol;
- change of alarm delay to start-up; now
w, more than the value of the DE LAY_START parameter, is includ
ded the delay im posed by their re
elative parameter
22 Appendix: Changes intro
oduced in
n Fw rele
ease 2.2
The FW
W release has changed from 2.1 to 2.2
The display of variabless relating to fan set point has beenn corrected whenn the floating condensing function is enabled and a condensing presssure probe is useed.
The “S
Suction_Probe1_A
Alarm”, “Suction__Probe1_Alarm and
a “Discharge_PProbe_Alarm” alaarms have changeed from manual tto automatic reseet.
23 Appendix
A
x: Chang
ges intro
oduced in
n Fw rele
ease 2.3
The FW
W release has changed from 2.2 a 2.3
New types of units havve been added to increase the product portfolio, wiith the introductioon of single-circuit and two-circuitt units with capaccity control; the time
betweeen activation of ccapacity-control steps
s
is fixed (5 seconds).
s
The following “/” param
meters have beenn modified:
/01: Range extended from 0-8 to 0-144
Two innteger variables hhave been added (visible to supervvisor only):
int 65 “Operating percenntage of first capaacity controlled com
mpressor in configgurations /01= 9,10,11,12,13 and 14”
int 66 “Operating percenntage of second capacity controlled compressor in coonfigurations /01=
= 9,10,11,12,13 annd 14”
CARELL reserves the right to make modiffications or changges to its productts without prior notice.
Cod. CAREL
C
+03P2204431 rel. 2.3 datedd 06/06/12
42
Cod.: +03P220431 - µrack Rel. 2.3 06/06/12
CAREL INDUSTRIES HQs
Via dell’Industria, 11 - 35020 Brugine - Padova (Italy)
Tel. (+39) 049.9716611 Fax (+39) 049.9716600
http: //www.carel.com - e-mail: [email protected]
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