Controller for temperature control - AK-CC 250A Manual

Controller for temperature control - AK-CC 250A Manual
Controller for temperature control
- AK-CC 250A
Manual
Introduction
Application
• The controller is used for temperature control refrigeration
appliances in supermarkets
• With many predefined applications one unit will offer you many
options. Flexibility has been planned both for new installations
and for service in the refrigeration trade. The special option for
setting the sensor type is ideal during maintenance.
Principle
The controller contains a temperature control where the signal
can be received from one or two temperature sensors.
The thermostat sensors are either placed in the cold air flow after
the evaporator, in the warm air flow just before the evaporator,
or both. A setting will determine how great an influence the two
signals are to have on the control.
A measurement of the defrost temperature can be obtained
directly through the use of an S5 sensor or indirectly through
the use of the S4 measurement. Four relays will cut the required
functions in and out – the application determines which. The
options are the following:
• Refrigeration (compressor or relay)
• Fan
• Defrost
• Rail heat
• Alarm
• Light
• Fans for hot gas defrost
• Refrigeration 2 (compressor 2 or relay 2)
The different applications are described on page 6.
Advantages
• Many applications in the same unit
• The controller has integrated refrigeration-technical functions,
so that it can replace a whole collection of thermostats and
timers
• Buttons and seal imbedded in the front
• Can control two compressors
• Fixed MODBUS data communication
• Quick setup
• Two temperature references
• Selection of sensor types
• Digital inputs for various functions
• Clock function with super cap backup
• HACCP (Hazard Analysis and Critical Control Points)
- Temperature monitoring and registration of period with too
high temperature (see also page 19)
- Factory calibration that will guarantee a better measuring
accuracy than stated in the standard EN 441-13 without
subsequent calibration (Pt 1000 ohm sensor)
Contents
Introduction........................................................................................................ 2
Operation............................................................................................................. 3
Applications........................................................................................................ 6
Survey of functions........................................................................................... 8
2
Operation...........................................................................................................18
Menu survey......................................................................................................20
Connections......................................................................................................23
Ordering.............................................................................................................25
Data......................................................................................................................26
Manual RS8GC202 © Danfoss 2-2014
AK-CC 250A
Operation
Sensors
Up to two thermostat sensors can be connected to the controller.
The relevant application determines how.
A sensor in the air before the evaporator:
This connection is primarily used when control is based on area.
A sensor in the air after the evaporator:
This connection is primarily used when refrigeration is controlled
and there is a risk of a too low temperature near the products.
A sensor before and after the evaporator:
This connection offers you the possibility of adapting the
thermostat, the alarm thermostat and the display to the relevant
application. The signal to the thermostat, the alarm thermostat
and the display is set as a weighted value between the two
temperatures, and 50% will for example give the same value from
both sensors.
The signal to the thermostat, the alarm thermostat and the display
can be set independently of one another.
Defrost sensor
The best signal concerning the evaporator’s temperature
is obtained from a defrost sensor mounted directly on the
evaporator. Here the signal may be used by the defrost function,
so that the shortest and most energy-saving defrost can take
place.
If a defrost sensor is not required, defrost can be stopped based
on time, or S4 can be selected.
AK-CC 250A will receive a signal from Pt 1000 Ω sensors or
from PTC sensors.
See o06.
Control of two compressors
This control is used for controlling two compressors of the same
size. The principle for control is that one of the compressors
connects at ½ the differential of the thermostat, and the other at
the full differential. When the thermostat cuts in the compressor
with the fewest operating hours is started. The other compressor
will only start after a set time delay, so that the load will be
divided between them. The time delay has a higher priority than
the temperature.
When the air temperature has dropped by half the differential the
one compressor will stop, the other will continue working and not
stop until the required temperature is achieved.
The compressors used must be of a type that is capable of starting
up against a high pressure.
Change of temperature reference
In an impulse appliance, for example, used for various product
groups. Here the temperature reference is changed easily with
a contact signal on a digital input. The signal raises the normal
thermostat value by a predefined amount. At the same time the
alarm limits with the same value are displaced accordingly.
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Manual RS8GC202 © Danfoss 2-2014
3
Digital inputs
There are two digital inputs both of which can be used for the
following functions:
- Case cleaning
- Door contact function with alarm
- Starting a defrost
- Coordinated defrost
- Change-over between two temperature reference
- Retransmission of a contact’s position via data communication
Case cleaning function
This function makes it easy to steer the refrigeration appliance
through a cleaning phase. Via three pushes on a switch you
change from one phase to the next phase.
The first push stops the refrigeration – the fans keep working
”Later”: The next push stops the fans
”Still later”: The next push restarts refrigeration
The different situations can be followed on the display.
On the network a cleaning alarm is transmitted to the system unit.
This alarm can be ”logged” so that proof of the sequence of events
is provided.
-
+
+
°C
1
÷
+
Fan
2
÷
÷
Off
3
+
+
°C
Door contact function
In cold rooms and frost rooms the door switch can switch the light
on and off, start and stop the refrigeration and give alarm if the
door has remained open for too long.
Defrost
Depending on the application you may choose between the following defrost methods:
Natural: Here the fans are kept operating during the defrost
Electric: The heating element is activated
Brine:
The valve is kept open so that the brine can flow through the evaporator
Hot gas:
Here the solenoid valves are controlled so that the hot gas can flow through the evaporator
Start of defrost
A defrost can be started in different ways
Interval:
Defrost is started at fixed time intervals, say, every eighth hour
Refrigeration time:
Defrost is started at fixed refrigeration time inter-
vals, in other words, a low need for
refrigeration will ”postpone” the coming defrost
Schedule:
Here defrost can be started at fixed times of the day and night. However, max. 6 times
Contact:
Defrost is started with a contact signal on a digital input
Network:
The signal for defrost is received from a system unit
via the data communication
S5 temp
In 1:1 systems the efficiency of the evaporator can be followed. Icing-up will start a defrost.
Manual:
An extra defrost can be activated from the control-
ler’s lower-most button
Hot gas application
All the mentioned methods can be used at random – if just one
them is activated a defrost will be started.
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AK-CC 250A
Coordinated defrost
There are two ways in which coordinated defrost can be arranged.
Either with wire connections between the controllers or via data
communication
Wire connections
One of the controllers is defined to be the controlling unit and
a battery module may be fitted in it so that the clock is ensured
backup. When a defrost is started all the other controllers will
follow suit and likewise start a defrost. After the defrost the individual controllers will move into waiting position. When all are in
waiting position there will be a change-over to refrigeration.
(If just one in the group demands defrost, the others will follow
suit).
System manager
Defrost via data communication
All controllers are fitted with a data communication module, and
via the override function from a system manager the defrost can
be coordinated.
Defrost on demand
1 Based on refrigeration time
When the aggregate refrigeration time has passed a fixed time,
a defrost will be started.
2 Based on temperature
The controller will constantly follow the temperature at S5.
Between two defrosts the S5 temperature will become lower
the more the evaporator ices up (the compressor operates for a
longer time and pulls the S5 temperature further down). When
the temperature passes a set allowed variation the defrost will
be started.
This function can only work in 1:1 systems
Extra module
The controller can afterwards be fitted with an insertion module if
the application requires it.
The controller has been prepared with plug, so the module simply
has to be pushed in.
Battery module
The module guarantees voltage to the controller if the supply
voltage should drop out for more than four hours. The clock function can thus be protected during a power failure.
External display
The controller can be connected to an external display, but only if
the application is standalone. The controller may not be connected to the data communication to a system manager.
One display type EKA 163A or 164A can be connected.
When use of EKA 164A operation can be done both on the external display and directly on the controller.
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Manual RS8GC202 © Danfoss 2-2014
5
A setting will define the relay outputs so that the controller’s
interface will be targeted to the chosen application.
On page 20 you can see the relevant settings for the respective
wiring diagrams.
Refrigeration control with one compressor
The functions are adapted to small refrigeration systems which
either may be refrigeration appliances or cold rooms.
The three relays can control the refrigeration, the defrost and the
fans, and the fourth relay can be used for either alarm function,
light control or rail heat control
• The alarm function can be linked up with a contact function
from a door switch. If the door remains open longer than allowed there will be an alarm.
• The light control can also be linked up with a contact function
from a door switch. An open door will switch on the light and
it will remain lit for two minutes after the door has been closed
again.
• The rail heat function can be used in refrigeration or freezing
appliances or on the door’s heating element for frost rooms.
The fans can be stopped during defrost and they may also follow
a door switch’s open/close situation.
S3 and S4 are temperature sensors. The application will determine whether either one or the other or both sensors are to be
used. S3 is placed in the air flow before the evaporator. S4 after
the evaporator.
A percentage setting will determine according to what the
control is to be based. S5 is a defrost sensor and is placed on the
evaporator.
DI1 and DI2 are contact functions that can be used for one of the
following functions: door function, alarm function, defrost start,
external main switch, night operation, change of thermostat reference, appliance cleaning, forced refrigeration or coordinated
defrost. See the functions in settings o02 and o37.
1
2
Danfoss
84B2428.12
Here is a survey of the controller’s field of application.
Danfoss
84B2429.13
Applications
3
Hot gas defrost
This type of connection can be used on systems with hotgas
defrost, but only in small systems in, say, supermarkets – the
functional content has not been adapted to systems with large
charges. Relay 1’s change-over function can be used by the
bypass valve and/or the hotgas valve.
Relay 2 is used for refrigeration.
6
Danfoss
84B2430.13
There are several other functions for the alarm function as well
as the light control, rail heat control and fans. Please refer to the
respective settings.
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AK-CC 250A
Refrigeration control with two compressors
5
This group of applications can be used if the controller is to cut
two compressors in and out.
The functions can be compared with wiring diagrams 1 to 3, but
instead of controlling fans the relay is here used for compressor
2.
The two compressors must be of the same size. When the
controller demands refrigeration it will first cut in the compressor with the shortest operating time. After the time delay the
second compressor will be cut in.
When the temperature has dropped to ”the middle of the differential”, the compressor with the longest operation time will be
cut out.
If the running compressor does not manage to reduce the temperature to the cutout point, the other compressor will be cut in
again. This happens when the temperature reaches the top part
of the differential. If the temperature is instead ”stuck” in the differential for two hours, there will be a change-over between the
two compressors so that the operating time can be equalised.
The two compressors must be of a type that can start up against
a high pressure.
6
7
The compressors’s settings for ”Min On time” and ”Min Off time”
will always have top priority during normal regulation. But if one
of the override functions is activated, the ”Min On time” will be
disregarded.
If the controller is to cut 2 compressor and 1 fan in and out, relay
4 must cut the fan in and out.
This function is activated in application 10.
10
Simple refrigeration with defrost
8
Heating function
9
This application can be used where there is only regulation of
refrigeration and defrost.
This application is the same as under 1, but a heating function
has been added which protects the unit against too low temperature. The defrost function’s heating element is here used for
heating.
This application is used where the temperature can go below
the set cutout temperature for the refrigeration. To ensure that
the temperature will not become too low the heating element is
activated x degrees below the reference value.
The S3 sensor must be mounted. It supplies the signal when
there is heating.
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Manual RS8GC202 © Danfoss 2-2014
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Survey of functions
Function
Para- Parameter by operation via data
meter communication
Normal display
Normally the temperature value from one of the two thermostat sensors S3 or S4 or a
mixture of the two measurements is displayed.
In o17 the ratio is determined.
Thermostat
Set point
Regulation is based on the set value plus a displacement, if applicable. The value is set
via a push on the centre button.
The set value can be locked or limited to a range with the settings in r02 and r 03.
The reference at any time can be seen in ”u28 Temp. ref”
Differential
When the temperature is higher than the reference + the set differential, the compressor relay will be cut in. It will cut out again when the temperature comes down to
the set reference.
Display air (u56)
Thermostat control
Cutout °C
r01
Differential
To avoid a too high setting of the setpoint, the max. allowable reference value must
be lowered.
To avoid a too low setting of the setpoint, the min. allowable reference value must be
increased.
Correction of the display’s temperature showing
If the temperature at the products and the temperature received by the controller are
not identical, an offset adjustment of the shown display temperature can be carried
out.
Temperature unit
Set here if the controller is to show temperature values in °C or in °F.
r02
Max cutout °C
r03
Min cutout °C
r04
Disp. Adj. K
r05
Temp. unit
°C=0. / °F=1
(Only °C on AKM, whatever the setting)
Correction of signal from S4
Compensation possibility through long sensor cable or using the PTC sensors.
r09
Adjust S4
Correction of signal from S3
Compensation possibility through long sensor cable or using the PTC sensors.
r10
Adjust S3
Start / stop of refrigeration
With this setting refrigeration can be started, stopped or a manual override of the
outputs can be allowed.
Start / stop of refrigeration can also be accomplished with the external switch function connected to a DI input.
Stopped refrigeration will give a ”Standby alarm”.
Night setback value
The thermostat’s reference will be the setpoint plus this value when the controller
changes over to night operation. (Select a negative value if there is to be cold accumulation.)
Selection of thermostat sensor
Here you define the sensor the thermostat is to use for its control function. S3, S4, or a
combination of them. With the setting 0%, only S3 is used (Sin). With 100%, only S4.
(For application 9 an S3 sensor must be used)
Heating function
The function uses the defrost function’s heating element for raising the temperature.
The function enters into force a number of degrees (r36) below the actual reference
and cuts out again with a differential of 2 degrees. Regulation is carried out with
100% signal from the S3 sensor. The fans will be operating when there is heating. The
fans and the heating function will stop if door function has been selected and the
door is opened.
Where this function is used an external safety cutout should also be installed, so that
superheating of the heating element cannot take place. Remember to set D01 to
electrical defrosting.
r12
Main Switch
Ref.Dif.
Setpoint limitation
The controller’s setting range for the setpoint may be narrowed down, so that much
too high or much too low values are not set accidentally - with resulting damages.
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Manual RS8GC202 © Danfoss 2-2014
1: Start
0: Stop
-1: Manual control of outputs allowed
r13
Night offset
r15
Ther. S4 %
r36
HeatStartRel
AK-CC 250A
Activation of reference displacement
When the function is changed to ON the thermostat reference will be displaced by
the value in r40. Activation can also take place via input DI1 or DI2 (defined in o02 or
o37).
r39
Th. offset
Value of reference displacement
The thermostat reference and the alarm values are shifted the following number of
degrees when the displacement is activated. Activation can take place via r39 or input
DI
r40
Th. offset K
Night setbck
(start of night signal)
Forced cool.
(start of forced cooling)
Alarm settings
Alarm
The controller can give alarm in different situations. When there is an alarm all the
light-emitting diodes (LED) will flash on the controller front panel, and the alarm relay
will cut in.
Alarm delay (short alarm delay)
If one of the two limit values is exceeded, a timer function will commence. The alarm
will not become active until the set time delay has been passed. The time delay is set
in minutes.
A03
With data communication the importance of the individual alarms can be
defined. Setting is carried out in the
“Alarm destinations” menu.
Alarm delay
Time delay for door alarm
The time delay is set in minutes.
The function is defined in o02 or in o37.
Time delay for cooling (long alarm delay)
This time delay is used during start-up, during defrost, immediately after a defrost.
There will be change-over to the normal time delay (A03) when the temperature has
dropped below the set upper alarm limit.
The time delay is set in minutes.
Upper alarm limit
Here you set when the alarm for high temperature is to start. The limit value is set in
°C (absolute value). The limit value will be raised during night operation. The value is
the same as the one set for night setback, but will only be raised if the value is positive.
The limit value will also be raised in connection with reference displacement r39.
Lower alarm limit
Here you set when the alarm for low temperature is to start. The limit value is set in °C
(absolute value).
The limit value will also be raised in connection with reference displacement r39.
Delay of a DI1 alarm
A cut-out/cut-in input will result in alarm when the time delay has been passed. The
function is defined in o02.
Delay of a DI2 alarm
A cut-out/cut-in input will result in alarm when the time delay has been passed. The
function is defined in o37
Signal to the alarm thermostat
Here you have to define the ratio between the sensors which the alarm thermostat
has to use. S3, S4 or a combination of the two.
With setting 0% only S3 is used. With 100% only S4 is used
A04
DoorOpen del
A12
Pulldown del
A13
HighLim Air
A14
LowLim Air
A27
AI.Delay DI1
A28
AI.Delay DI2
A36
Alarm S4%
Reset alarm
EKC error
Compressor
Compressor control
The compressor relay works in conjunction with the thermostat. When the thermostat calls for refrigeration will the compressor relay be operated.
Running times
To prevent irregular operation, values can be set for the time the compressor is to run
once it has been started. And for how long it at least has to be stopped.
The running times are not observed when defrosts start.
Min. ON-time (in minutes)
Min. OFF-time (in minutes)
AK-CC 250A
c01
c02
Manual RS8GC202 © Danfoss 2-2014
Min. On time
Min. Off time
9
Time delay for couplings of two compressors
Settings indicate the time that has to elapse from the first relay cuts in and until the
next relay has to cut in.
Reversed relay function for D01
0: Normal function where the relay cuts in when refrigeration is demanded
1: Reversed function where the relay cuts out when refrigeration is demanded (this
wiring produces the result that there will be refrigeration if the supply voltage to the
controller fails).
The LED on the controller’s front will show whether refrigeration is in progress.
Defrost
The controller contains a timer function that is zeroset after each defrost start.
The timer function will start a defrost if/when the interval time is passed.
The timer function starts when voltage is connected to the controller, but it is displaced the first time by the setting in d05.
If there is power failure the timer value will be saved and continue from here when
the power returns.
This timer function can be used as a simple way of starting defrosts, but it will always
act as safety defrost if one of the subsequent defrost starts is not received.
The controller also contains a real-time clock. By means of settings of this clock and
times for the required defrost times, defrost can be started at fixed times of the day.
If there is a risk of power failure for periods longer than four hours, a battery module
should be mounted in the controller.
Defrost start can also be accomplished via data communication, via contact signals or
manual start-up.
All starting methods will function in the controller. The different functions have to be
set, so that defrosts do not ”come tumbling” one after the other.
Defrost can be accomplished with electricity, hotgas or brine.
The actual defrost will be stopped based on time or temperature with a signal from a
temperature sensor.
Defrost method
Here you set whether defrost is to be accomplished with electricity, gas, brine or
"non".
During defrost the defrost relay will be cut in.
(With brine the ”refrigeration control valve” will be kept open during defrost)
c05
Step delay
c30
Cmp relay NC
Comp Relay
Here you can read the status of the
compressor relay, or you can forcecontrol the relay in the ”Manual
control” mode
Defrost control
d01
Def. method
0 = non
1 = El
2 = Gas
3= Brine
Defrost stop temperature
The defrost is stopped at a given temperature which is measured with a sensor (the
sensor is defined in d10).
The temperature value is set.
d02
Def. Stop Temp
Interval between defrost starts
The function is zero set and will start the timer function at each defrost start. When
the time has expired the function will start a defrost.
The function is used as a simple defrost start, or it may be used as a safeguard if the
normal signal fails to appear.
If master/slave defrost without clock function or without data communication is used,
the interval time will be used as max. time between defrosts.
If a defrost start via data communication does not take place, the interval time will be
used as max. time between defrosts.
When there is defrost with clock function or data communication, the interval time
must be set for a somewhat longer period of time than the planned one, as the
interval time will otherwise start a defrost which a little later will be followed by the
planned one.
In connection with power failure the interval time will be maintained, and when the
power returns the interval time will continue from the maintained value.
The interval time is not active when set to 0.
Max. defrost duration
This setting is a safety time so that the defrost will be stopped if there has not already
been a stop based on temperature or via coordinated defrost.
d03
Def Interval
(0=off )
d04
Max Def. time
Time staggering for defrost cut ins during start-up
The function is only relevant if you have several refrigeration appliances or groups
where you want the defrost to be staggered in relation to one another. The function is
furthermore only relevant if you have chosen defrost with interval start (d03).
The function delays the interval time d03 by the set number of minutes, but it only
does it once, and this at the very first defrost taking place when voltage is connected
to the controller.
The function will be active after each and every power failure.
d05
Time Stagg.
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Manual RS8GC202 © Danfoss 2-2014
AK-CC 250A
Drip-off time
Here you set the time that is to elapse from a defrost and until the compressor is to
start again. (The time when water drips off the evaporator).
d06
DripOff time
Delay of fan start after defrost
Here you set the time that is to elapse from compressor start after a defrost and until
the fan may start again. (The time when water is “tied” to the evaporator).
d07
FanStartDel
Fan start temperature
The fan may also be started a little earlier than mentioned under “Delay of fan start
after defrost”, if the defrost sensor S5 registers another allowable value than the one
set here.
Fan cut in during defrost
Here you can set whether fan is to operate during defrost.
0: Stopped (Runs during pump down)
1: Running (stopped during "fan delay")
2: Running during pump down and defrost. After that stopped
Defrost sensor
Here you define the defrost sensor.
0: None, defrost is based on time
1: S5
2: S4
Pumpdown delay
Set the time where the evaporator is emptied of refrigerant prior to the defrost.
d08
FanStartTemp
d09
FanDuringDef
d10
DefStopSens.
d16
Pump dwn del.
Drain delay (only in connection with hotgas)
Set the time where the evaporator is emptied of condensed refrigerant after the
defrost.
Defrost on demand – aggregate refrigeration time
Set here is the refrigeration time allowed without defrosts. If the time is passed, a
defrost will be started.
With setting = 0 the function is cut out.
Defrost on demand – S5 temperature
The controller will follow the effectivity of the evaporator, and via internal calculations and measurements of the S5 temperature it will be able to start a defrost when
the variation of the S5 temperature becomes larger than required.
Here you set how large a slide of the S5 temperature can be allowed. When the value
is passed, a defrost will start.
The function can only be used in 1:1 systems when the evaporating temperature
will become lower to ensure that the air temperature will be maintained. In central
systems the function must be cut out.
With setting = 20 the function is cut out
Delay of the hot gas injection
Can be used when vales of the type PMLX and GPLX are used. Time is set so that the
valve is closed completely before the hot gas is turned on.
If you wish to see the temperature at the defrost sensor, push the controller’s lowermost button.
If you wish to start an extra defrost, push the controller’s lowermost button for four
seconds.
You can stop an ongoing defrost in the same way
d17
Drain del
d18
MaxTherRunT
d19
CutoutS5Dif.
d23
-Defrost temp.
Def Start
Here you can start a manual defrost
The LED on the controller’s front will indicate whether a defrost is going on.
Fan
Fan stopped at cut-out compressor
Here you can select whether the fan is to be stopped when the compressor is cut out
Delay of fan stop when compressor is cut out
If you have chosen to stop the fan when the compressor is cut out, you can delay the
fan stop when the compressor has stopped.
Here you can set the time delay.
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
Defrost Relay
Here you can read the defrost relay
status or you can force-control the
relay in “Manual control” mode.
F01
F02
Hold After Def
Shows ON when the controller is
operating with coordinated defrost.
Defrost State
Status on defrost
1= pump down / defrost
Fan control
Fan stop CO
(Yes = Fan stopped)
Fan del. CO
11
Fan stop temperature
The function stops the fans in an error situation, so that they will not provide power
to the appliance. If the defrost sensor registers a higher temperature than the one set
here, the fans will be stopped. There will be re-start at 2 K below the setting.
The function is not active during a defrost or start-up after a defrost.
With setting +50°C the function is interrupted.
The LED on the controller’s front will indicate whether a defrost is going on.
HACCP
HACCP temperature
Here you can see the temperature measurement that transmits signal to the function
Last too high HACCP temperature was registered in connection with: (Value can be
read out).
H01: Temperature exceeding during normal regulation.
H02: Temperature exceeding during power failure. Battery backup controls the times.
H03: Temperature exceeding during power failure. No control of times.
Last time the HACCP temperature was exceeded: Year
Last time the HACCP temperature was exceeded: Month
Last time the HACCP temperature was exceeded: Day
Last time the HACCP temperature was exceeded: Hour
Last time the HACCP temperature was exceeded: Minute
Last exceeding: Duration in hours
Last exceeding: Duration in minutes
Peak temperature
The highest measured temperature will continuously be saved when the temperature
exceeds the limit value in h12. The value can be read out until the next time the temperature exceeds the limit value. After that it is overwritten with the new measurements.
Selection of function
0: No HACCP function
1: S3 and/or S4 used as sensor. Definition takes place in h14.
2: S5 used as sensor.
Alarm limit
Here you set the temperature value at which the HACCP function is to enter into
force. When the value becomes higher than the set one, the time delay starts.
Time delay for the alarm (only during normal regulation).
When the time delay has been passed the alarm is activated.
Selection of sensors for the measuring
If the S4 sensor and/or the S3 sensor is used, the ratio between them must be set.
At setting 100% only S4 is used. At setting 0% only S3 is used.
Internal defrosting schedule/clock function
(Not used if an external defrosting schedule is used via data communication.)
Up to six individual times can be set for the defrost start throughout the day.
F04
FanStopTemp.
Fan Relay
Here you can read the fan relay status,
or force-control the relay in “Manual
control” mode.
h01
HACCP
HACCP temp.
h02
-
h03
h04
h05
h06
h07
h08
h09
h10
Max.temp.
h11
HACCP sensor
h12
HACCP limit
h13
HACCP delay
h14
HACCP S4%
Defrost start, hour setting
t01-t06
Defrost start, minute setting (1 and 11 belong together, etc.)
t11-t16
When all t01 to t16 equal 0 the clock will not start defrosts.
Real-time clock::
Setting the clock is only necessary when there is no data communication.
In the event of a power failure of less than four hours, the clock function will be saved.
Clock: Hour setting
t07
Clock: Minute setting
t08
Clock: Date setting
t45
Clock: Month setting
t46
Clock: Year setting
t47
Miscellaneous
Delay of output signal after start-up
After start-up or a power failure the controller’s functions can be delayed so that overloading of the electricity supply network is avoided.
Here you can set the time delay.
12
Manual RS8GC202 © Danfoss 2-2014
o01
Miscellaneous
DelayOfOutp.
AK-CC 250A
Digital input signal - DI1
The controller has a digital input 1 which can be used for one of the following functions:
Off: The input is not used
1) Status display of a contact function
2) Door function. When the input is open it signals that the door is open. The refrigeration and the fans are stopped. When the time setting in “A4” is passed, an alarm
will be given and refrigeration will be resumed.
3) Door alarm. When the input is open it signals that the door is open. When the time
setting in “A4” is passed, there will be alarm.
4) Defrost. The function is started with a pulse signal. The controller will register when
the DI input is activated. The controller will then start a defrost cycle. If the signal
is to be received by several controllers it is important that ALL connections are
mounted the same way (DI to DI and GND to GND).
5) Main switch. Regulation is carried out when the input is short-circuited, and regulation is stopped when the input is put in pos. OFF.
6) Night operation. When the input is short-circuited, there will be regulation for
night operation.
7) Reference displacement when DI1 is short-circuited. Displacement with “r40”.
8) Separate alarm function. Alarm will be given when the input is short-circuited.
9) Separate alarm function. Alarm will be given when the input is opened. (For 8 and
9 the time delay is set in A27)
10) Case cleaning. The function is started with a pulse signal. Cf. also description on
page 4.
11) Forced refrigeration at hotgas defrost when the input is short-circuited.
Data communication
If the controller is built into a network with data communication, it must have an
address, and the system manager of the data communication must then know this
address.
The installation of the data communication cable has been mentioned in a separate
document “RC8AC”.
The address is set between 0 and 240.
Address downloaded into system manager when the system manager's scan function
is activated
IMPORTANT: Before you start the scan function you MUST set o61. Otherwise you will
be transmitting incorrect data.
Access code 1 (Access to all settings)
If the settings in the controller are to be protected with an access code you can set a
numerical value between 0 and 100. If not, you can cancel the function with setting 0.
(99 will always give you access).
Sensor type
Pt: Pt 1000 Ω @ 0°C
P01: PTC 1000 Ω (nominal 990 Ω) = EKS 111
P02: PTC 1000 Ω @ 25°C (nominal 1000 Ω)
o02
DI 1 Config.
Definition takes place with the numerical value shown to the left.
(0 = off )
DI state
(Measurement)
The DI input’s present status is shown
here. ON or OFF.
o03
After installation of data communication the controller can be operated on
an equal footing with the
other controllers in ADAP-KOOL®
refrigeration controls.
o05
-
o06
SensorConfig
Pt = 3
PTC (EKS 111) = 4
PTC = 5
All the mounted sensors must be of the same type.
Display step
Yes: Gives steps of 0.5°
No: Gives steps of 0.1°
Max. standby time after coordinated defrost
When a controller has completed a defrost it will wait for a signal which tells that the
refrigeration may be resumed. If this signal fails to appear for one reason or another,
the controller will itself start the refrigeration when this standby time has elapsed.
Select signal for the display S4%
Here you define the signal to be shown by the display.
S3, S4, or a combination of the two.
With setting 0% only S3 is used. With 100% only S4.
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
o15
Disp. Step = 0.5
o16
Max HoldTime
o17
Disp. S4%
13
Digital input signal - D2
The controller has a digital input 2 which can be used for one of the following functions:
Off: The input is not used.
1)Status display of a contact function
2) Door function. When the input is open it signals that the door is open. The refrigeration and the fans are stopped. When the time setting in “A4” is passed, an alarm
will be given and refrigeration resumed.
3) Door alarm. When the input is open it signals that the door is open. When the time
setting in “A4” is passed an alarm will be given.
4) Defrost. The function is started with a pulse signal. The controller will register when
the DI input is activated. The controller will then start a defrost cycle. If the signal
is to be received by several controllers it is important that ALL connections are
mounted the same way (DI to DI and GND to GND).
5) Main switch. Regulation is carried out when the input is short-circuited, and regulation is stopped when the input is put in pos. OFF.
6) Night operation. When the input is short-circuited, there will be regulation for
night operation.
7) Reference displacement when DI2 is short-circuited. Displacement with “r40”.
8) Separate alarm function. Alarm will be given when the input is short-circuited.
9) Separate alarm function. Alarm will be given when the input is opened.
10) Case cleaning. The function is started with a pulse signal. Cf. also description on
page 4.
11) Forced refrigeration at hotgas defrost when the input is short-circuited.
12) The input is used for coordinated defrost in conjunction with other controllers of
the same type
Configuration of light function (relay 4 in applications 2 and 6)
1) The relay cuts in during day operation
2) The relay to be controlled via data communication
3) The relay to be controlled by the door switch defined in either o02 or o37 where
the setting is selected to either 2 or 3. When the door is opened the relay will cut in.
When the door is closed again there will be a time delay of two minutes before the
light is switched off.
Activation of light relay
The light relay can be activated here, but only if defined in o38 with setting 2.
o37
DI2 config.
o38
Light config
o39
Light remote
Rail heat during day operation
The ON period is set as a percentage of the time
Rail heat during night operation
The ON period is set as a percentage of the time
Rail heat cycle
The period of time for the aggregate ON time + OFF time is set in minutes
Case cleaning
The status of the function can be followed here or the function can be started manually.
0 = Normal operation (no cleaning)
1 = Cleaning with fans operating. All other outputs are Off.
2 = Cleaning with stopped fans. All outputs are Off.
If the function is controlled by a signal at the DI1 or DI2 input, the relevant status can
be seen here in the menu.
Selection of application
The controller can be defined in various ways. Here you set which of the 10 applications is required. On page 6 you can see a survey of applications.
This menu can only be set when regulation is stopped, i.e. “r12” is set to 0.
Transfer a set of presetting to the controller
It is possible to select a quick setting of a number of parameters. It depends on
whether an application or a room is to be controlled and whether defrost is to be
stopped based on time or based on temperature. The survey can be seen on page 22.
This menu can only be set when regulation is stopped, i.e. “r12” is set to 0.
o41
Railh.ON day%
o42
Railh.ON ngt%
o43
Railh. cycle
o46
Case clean
o61
--- Appl. Mode (only output in Danfoss
only)
o62
-
o64
-
o65
-
After the setting the value will return to 0. Any subsequent adjustment/setting of
parameters can be made, as required.
Access code 2 (Access to adjustments)
There is access to adjustments of values, but not to configuration settings. If the settings in the controller are to be protected with an access code you can set a numerical value between 0 and 100. If not, you can cancel the function with setting 0. If the
function is used, access code 1 (o05) must also be used.
Copy the controller’s present settings
With this function the controller’s settings can be transferred to a programming key.
The key can contain up to 25 different sets. Select a number. All settings except for
Application (o61) and Address (o03) will be copied. When copying has started the display returns to o65. After two seconds you can move into the menu again and check
whether the copying was satisfactory.
Showing of a negative figure spells problems. See the significance in the Fault Message section.
14
Manual RS8GC202 © Danfoss 2-2014
AK-CC 250A
Copy from the programming key
This function downloads a set of settings earlier saved in the controller. Select the
relevant number.
All settings except for Application (o61) and Address (o03) will be copied. When copying has started the display returns to o66. After two seconds you can move back into
the menu again and check whether the copying was satisfactory. Showing of a negative figure spells problems. See the significance in the Fault Message section.
Save as factory setting
With this setting you save the controller’s actual settings as a new basic setting (the
earlier factory settings are overwritten).
o66
-
o67
- - - Night Setback
0=Day
1=Night
Service
Temperature measured with S5 sensor
Status on DI1 input. on/1=closed
Temperature measured with S3 sensor
Status on night operation (on or off ) 1=closed
Temperature measured with S4 sensor
Thermostat temperature
Read the present regulation reference
Status on DI2 output. on/1=closed
Temperature shown on display
Measured temperature for alarm thermostat
** Status on relay for cooling
** Status on relay for fan
** Status on relay for defrost
** Status on relay for railheat
** Status on relay for alarm
** Status on relay for light
** Status on relay for valve in suction line
** Status on relay for compressor 2
*) Not all items will be shown. Only the function belonging to the selected application can be seen.
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
u09
u10
u12
u13
u16
u17
u28
u37
u56
u57
u58
u59
u60
u61
u62
u63
u64
u67
Service
S5 temp.
DI1 status
S3 air temp
Night Cond.
S4 air temp
Ther. air
Temp. ref.
DI2 status
Display air
Alarm air
Comp1/LLSV
Fan relay
Def. relay
Railh. relay
Alarm relay
Light relay
SuctionValve
Comp2 relay
15
Fault message
Alarms
In an error situation the LED’s on the front will flash and the alarm relay will be activated. If you push the top button in this situation you can see the alarm report in the
display. If there are more keep on pushing to see them.
There are two kinds of error reports - it can either be an alarm occurring during the
daily operation, or there may be a defect in the installation.
A-alarms will not become visible until the set time delay has expired.
E-alarms, on the other hand, will become visible the moment the error occurs.
(An A alarm will not be visible as long as there is an active E alarm).
Here are the messages that may appear:
A1: High temperature alarm
1 = alarm
High t. alarm
A2: Low temperature alarm
Low t. alarm
A4: Door alarm
Door Alarm
A5: Information. Parameter o16 is expired
Max Hold Time
A15: Alarm. Signal from DI1 input
DI1 alarm
A16: Alarm. Signal from DI2 input
DI2 alarm
A45: Standby position (stopped refrigeration via r12 or DI input)
Standby mode
A59: Case cleaning. Signal from DI1 or DI2 input
Case cleaning
A60: High-temperature alarm for the HACCP function
HACCP alarm
Max. def time
E1: Faults in the controller
EKC error
E6: Fault in real-time clock. Check the battery / reset the clock.
-
E25: Sensor error on S3
S3 error
E26: Sensor error on S4
S4 error
E27: Sensor error on S5
S5 error
When copying settings to or from a copying key with functions o65 or o66, the following information may appear:
0: Copying concluded and OK
4: Copying key not correctly mounted
5: Copying was not correct. Repeat copying
6: Copying to EKC incorrect. Repeat copying
7: Copying to copying key incorrect. Repeat copying
8: Copying not possible. Order number or software version do not match
9: Communication error and time out
10: Copying still going on
(The information can be found in o65 or o66 a couple of seconds after copying has
been started).
Alarm destinations
The importance of the individual
alarms can be defined with a setting
(0, 1, 2 or 3)
16
Manual RS8GC202 © Danfoss 2-2014
AK-CC 250A
Operating status
(Measurement)
The controller goes through some regulating situations where it is just waiting for
the next point of the regulation. To make these “why is nothing happening” situations
visible, you can see an operating status on the display. Push briefly (1s) the upper button. If there is a status code, it will be shown on the display.
The individual status codes have the following meanings:
S0: Regulating
EKC State:
(Shown in all menu displays)
S1: Waiting for end of the coordinated defrost
1
S2: When the compressor is operating it must run for at least x minutes.
2
S3: When the compressor is stopped, it must remain stopped for at least x minutes.
3
S4: The evaporator drips off and waits for the time to run out
4
S10: Refrigeration stopped by main switch. Either with r12 or a DI-input
10
S11: Refrigeration stopped by thermostat
11
S14: Defrost sequence. Defrost in progress
14
S15: Defrost sequence. Fan delay — water attaches to the evaporator
15
S17: Door is open. DI input is open
17
S20: Emergency cooling *)
20
S25: Manual control of outputs
25
S29: Case cleaning
29
S30: Forced cooling
30
S32: Delay on outputs during start-up
32
S33: Heat function r36 is active
33
0
Other displays:
non: The defrost temperature cannot be displayed. There is stop based on time
-d-: Defrost in progress / First cooling after defrost
PS: Password required. Set password
*) Emergency cooling will take effect when there is lack of signal from a defined S3 or S4 sensor. The regulation will continue with a registered average
cutin frequency. There are two registered values – one for day operation and one for night operation.
Warning ! Direct start of compressors *
To prevent compressor breakdown parameter c01 and c02 should be set according to suppliers requirements or in general :
Hermetic Compressors c02 min. 5 minutes
Semihermetic Compressors c02 min. 8 minutes and c01 min. 2 to 5 minutes ( Motor from 5 to 15 KW )
* ) Direct activating of solenoid valves does not require settings different from factory (0)
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
17
Operation
Display
The values will be shown with three digits, and with a setting you
can determine whether the temperature are to be shown in °C or
in °F.
Light-emitting diodes (LED) on front panel
HACCP = HACCP function is active
The other LED’s on the front panel will light up when the belonging relay is activated.
= Refrigeration
= Defrost
= Fan runing
Set temperature
1. Push the middle button until the temperature value is shown
2. Push the upper or the lower button and select the new value
3. Push the middle button again to conclude the setting.
Reading the temperature at defrost sensor
• Push short the lower button
Manuel start or stop of a defrost
• Push the lower button for four seconds.
(Though not for application 4).
See HACCP registration
1. Give the middle button a long push until h01 appears
2. Select required h01-h10
3. See value by giving the middle button a short push
The light-emitting diodes will flash when there is an alarm.
In this situation you can download the error code to the display
and cancel/sign for the alarm by giving the top knob a brief push.
Defrost
During defrost a –d- is shown in the display. This view will continue up till 15 min. after the cooling has resumed.
However the view of –d- will be discontinued if:
- The temperature is suitable within the 15 minutes
- The regulation is stopped with “Main Switch”
- A high temperature alarm appears
The buttons
When you want to change a setting, the upper and the lower
buttons will give you a higher or lower value depending on the
button you are pushing. But before you change the value, you
must have access to the menu. You obtain this by pushing the
upper button for a couple of seconds - you will then enter the column with parameter codes. Find the parameter code you want to
change and push the middle buttons until value for the parameter
is shown. When you have changed the value, save the new value
by once more pushing the middle button.
Examples
Set menu
1. Push the upper button until a parameter r01 is shown
2. Push the upper or the lower button and find that parameter you
want to change
3. Push the middle button until the parameter value is shown
4. Push the upper or the lower button and select the new value
5. Push the middle button again to freeze the value.
Cutout alarm relay / receipt alarm/see alarm code
• Push short the upper button
If there are several alarm codes they are found in a rolling stack.
Push the uppermost or lowermost button to scan the rolling
stack.
18
Get a good start
With the following procedure you can start regulation very quickly:
1 Open parameter r12 and stop the regulation (in a new and not
previously set unit, r12 will already be set to 0 which means
stopped regulation.)
2 Open parameter o06 and set the used sensor type here
3 Select electric connection based on the drawings on page 6
4 Open parameter o61 and set the electric connection number in
it
5 Now select one of the preset settings from the table on page 22.
6 Open parameter o62 and set the number for the array of presettings. The few selected settings will now be transferred to the
menu.
7 Open parameter r12 and start the regulation
8 Go through the survey of factory settings. The values in the grey
cells are changed according to your choice of settings. Make any
necessary changes in the respective parameters.
9 For network. Set the address in o03 and start the scan function
in the system manager.
Manual RS8GC202 © Danfoss 2-2014
AK-CC 250A
HACCP
This function will follow the appliance temperature and sound an
alarm if the set temperature limit is exceeded. The alarm will come
when the time delay has elapsed.
When the temperature exceeds the limit value it will continuously
be registered and the peak value will be saved until the later readout. Saved together with the value will be the time and duration
of the temperature exceeding.
Examples of temperature exceeding:
The readout of the various values in the HACCP function can take
place with a long push on the middle button.
The readouts are, as follows:
h01: The temperature
h02: Readout of the controller’s status when temperature was
exceeded:
H1 = normal regulation.
H2 = power failure. Times are saved.
H3 = power failure. Times not saved.
h03: Time. Year
h04: Time. Month
h05: Time: Day
h06: Time. Hour
h07: Time. Minute
h08: Duration in hours
h09: Duration in minutes
h10: The registered peak temperature
(Setup of the function takes place just like the other setups. See
menu survey on the next page).
The HACCP function can be used directly when the sensors used
are type Pt 1000. This sensor type has a high degree of signal
precision.
Exceeding during normal regulation
If one of the other sensor types is used (PTC), the sensor's tolerance will be greater, resulting in decreased precision in terms of
providing a correct measurement. In this case, we recommend
adjusting the signal via the 'r09' and r10' settings.
Exceeding in connection with power failure where the controller
can keep on registering the time performance.
Exceeding in connection with power failure when the controller
has lost its clock function and hence also its time performance.
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
19
Menu survey
SW = 2.3x
Parameters
Function
Normal operation
Temperature (set point)
Thermostat
Differential
Max. limitation of setpoint setting
Min. limitation of setpoint setting
Adjustment of temperature indication
Temperature unit (°C/°F)
Correction of the signal from S4
Correction of the signal from S3
Manual service, stop regulation, start regulation (-1, 0, 1)
Displacement of reference during night operation
Definition and weighting, if applicable, of thermostat sensors
- S4% (100%=S4, 0%=S3)
The heating function is started a number of degrees below the
thermostats cutout temperature
Activation of reference displacement r40
Value of reference displacement (activate via r39 or DI)
Alarm
Delay for temperature alarm
Delay for door alarm
Delay for temperature alarm after defrost
High alarm limit
Low alarm limit
Alarm delay DI1
Alarm delay DI2
Signal for alarm thermostat. S4% (100%=S4, 0%=S3)
Compressor
Min. ON-time
Min. OFF-time
Time delay for cutin of comp.2
Compressor relay 1 must cutin and out inversely
(NC-function)
Defrost
Defrost method (none/EL/GAS/BRINE)
Defrost stop temperature
Interval between defrost starts
Max. defrost duration
Displacement of time on cutin of defrost at start-up
Drip off time
Delay for fan start after defrost
Fan start temperature
Fan cutin during defrost
***
***
***
0: Stopped
1: Running
2: Running during pump down and defrost
Defrost sensor (0=time, 1=S5, 2=S4)
Pump down delay
Drain delay
Max. aggregate refrigeration time between two defrosts
Defrost on demand - S5 temperature’s permitted variation during frost build-up. On central plant choose 20 K (=off )
Delay of hot gas defrost
Fan
Fan stop at cutout compressor
Delay of fan stop
Fan stop temperature (S5)
HACCP
Actual temperature measurement for the HACCP function
Last registered peak temperature
Selection of function and sensor for the HACCP function. 0 = no
HACCP function. 1 = S4 used (maybe also S3). 2 = S5 used
Alarm limit for the HACCP function
Time delay for the HACCP alarm
Select signal for the HACCP function. S4% (100% = S4, 0% = S3)
Real time clock
Six start times for defrost.
Setting of hours.
0=OFF
Six start times for defrost.
Setting of minutes.
0=OFF
Clock - Setting of hours
Clock - Setting of minute
Clock - Setting of date
Clock - Setting of month
Clock - Setting of year
20
Min.value
Max.value
Factory
setting
---
-50.0°C
50.0°C
2.0°C
r01
r02
r03
r04
r05
r09
r10
r12
r13
r15
0.1 K
-49.0°C
-50.0°C
-20.0 K
°C
-10.0 K
-10.0 K
-1
-10.0 K
0%
20.0K
50°C
49.0°C
20.0 K
°F
+10.0 K
+10.0 K
1
10.0 K
100%
2.0 K
50.0°C
-50.0°C
0.0 K
°C
0.0 K
0.0 K
0
0.0 K
100%
r36
-15.0 K
-3.0 K
-15.0 K
r39
r40
OFF
-50.0 K
ON
50.0 K
OFF
0.0 K
A03
A04
A12
A13
A14
A27
A28
A36
0 min
0 min
0 min
-50.0°C
-50.0°C
0 min
0 min
0%
240 min
240 min
240 min
50.0°C
50.0°C
240 min
240 min
100%
30 min
60 min
90 min
8.0°C
-30.0°C
30 min
30 min
100%
c01
c02
c05
c30
0 min
0 min
0 sec
0
OFF
30 min
30 min
999 sec
1
ON
0 min
0 min
0 sec
0
OFF
d01
d02
d03
d04
d05
d06
d07
d08
d09
no
0.0°C
0 hours
0 min
0 min
0 min
0 min
-15.0°C
0
bri
25.0°C
48 hours
180 min
240 min
60 min
60 min
0.0°C
2
EL
6.0°C
8 hours
45 min
0 min
0 min
0 min
-5.0°C
1
d10
d16
d17
d18
d19
0
0 min
0 min
0 hours
0.0 K
2
60 min
60 min
48 hours
20.0 k
0
0 min
0 min
0 hours
20.0 K
d23
0 min
60 min
0 min
F01
F02
F04
no
0 min
-50.0°C
yes
30 min
50.0°C
no
0 min
50.0°C
h01
h10
h11
0
2
0
h12
h13
h14
-50.0°C
0 min.
0%
50.0°C
240 min.
100%
8.0°C
30 min.
100%
t01-t06
0 hours
23 hours
0 hours
t11-t16
0 min
59 min
0 min
t07
t08
t45
t46
t47
0 hours
0 min
1
1
0
23 hours
59 min
31
12
99
0 hours
0 min
1
1
0
Codes
***
***
***
***
***
***
***
***
EL-diagram number (page 6)
3
4
5
6
7
8
1
2
Manual RS8GC202 © Danfoss 2-2014
9
10
Actual
setting
AK-CC 250A
Miscellaneous
Delay of output signals after start-up
Input signal on DI1. Function:
0=not used. 1=status on DI1. 2=door function with alarm
when open. 3=door alarm when open. 4=defrost start (pulsepressure). 5=ext.main switch. 6=night operation 7=change
reference (activate r40). 8=alarm function when closed.
9=alarm function when open. 10=case cleaning (pulse signal).
11=forced cooling at hot gas defrost.
Network address (0=off )
Access code 1 (all settings)
Used sensor type
Pt: Pt 1000 Ω @ 0°C
P01: PTC 1000 Ω (nominel 990 Ω) = EKS 111
P02: PTC 1000 Ω @ 25°C (nominel 1000 Ω)
Display step = 0.5 (normal 0.1 at Pt sensor)
Max hold time after coordinated defrost
Select signal for display view. S4% (100%=S4, 0%=S3)
Input signal on DI2. Function:
(0=not used. 1=status on DI2. 2=door function with alarm
when open. 3=door alarm when open. 4=defrost start (pulsepressure). 5=ext. main switch 6=night operation 7=change
reference (activate r40). 8=alarm function when closed.
9=alarm function when open. 10=case cleaning (pulse signal).
11=forced cooling at hot gas defrost.). 12=coordinated defrost)
Configuration of light function (relay 4)
1=ON during day operation. 2=ON / OFF via data communication. 3=ON follows the DI-function, when DI is selected to door
function or to door alarm
Activation of light relay (only if o38=2)
Rail heat On time during day operations
Rail heat On time during night operations
Rail heat period time (On time + Off time)
Case cleaning. 0=no case cleaning. 1=Fans only. 2=All output
Off.
Selection of EL diagram. See overview page 6
Download a set of predetermined settings. See overview page
22.
Access code 2 (partly access)
Save the controllers present settings to the programming key.
Select your own number.
Load a set of settings from the programming key (previously
saved via o65 function)
Replace the controllers factory settings with the present settings
Service
Status codes are shown on page 17
Temperature measured with S5 sensor
Status on DI1 input. on/1=closed
Temperature measured with S3 sensor
Status on night operation (on or off ) 1=closed
Temperature measured with S4 sensor
Thermostat temperature
Read the present regulation reference
Status on DI2 output. on/1=closed
Temperature shown on display
Measured temperature for alarm thermostat
Status on relay for cooling
Status on relay for fan
Status on relay for defrost
Status on relay for rail heat
Status on relay for alarm
Status on relay for light
Status on relay for valve in suction line
Status on relay for compressor 2
1
2
3
4
5
6
7
8
9
10
o01
o02
0s
1
600 s
11
5s
0
o03
o05
o06
0
0
240
100
0
0
Pt
P02
Pt
o15
o16
o17
o37
no
0 min
0%
0
yes
60 min
100%
12
no
20
100%
0
o38
1
3
1
***
o39
o41
o42
o43
o46
OFF
0%
0%
6 min
0
ON
100%
100%
60 min
2
OFF
100
100
10 min
0
*
*
o61
o62
1
0
10
6
1
0
***
o64
o65
0
0
100
25
0
0
o66
0
25
0
o67
OFF
On
OFF
***
***
***
***
**
**
**
**
**
**
**
**
S0-S33
u09
u10
u12
u13
u16
u17
u28
u37
u56
u57
u58
u59
u60
u61
u62
u63
u64
u67
*) Can only be set when regulation is stopped (r12=0)
**) Can be controlled manually, but only when r12=-1
***) With access code 2 the access to these menus will be limited
Factory setting
If you need to return to the factory-set values, it can be done in this way:
- Cut out the supply voltage to the controller
- Keep both buttons depressed at the same time as you recon­nect the supply voltage
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
21
Auxiliary table for settings
(quick-setup)
Preset settings (o62)
Case
Defrost stop on
time
Room
Defrost stop
on S5
Defrost stop on
time
Defrost stop
on S5
1
2
3
4
5
6
Temperature (SP)
4°C
2°C
-24°C
6°C
3°C
-22°C
Max. temp. setting (r02)
6°C
4°C
-22°C
8°C
5°C
-20°C
Min. temp. setting (r03)
2°C
0°C
-26°C
4°C
1°C
-24°C
Sensor signal for thermostat. S4% (r15)
100%
0%
Alarm limit high (A13)
10°C
8°C
-15°C
10°C
8°C
-15°C
Alarm limit low (A14)
-5°C
-5°C
-30°C
0°C
0°C
-30°C
Sensor signal for alarm funct.S4% (A36)
Interval between defrost (d03)
Defrost sensor: 0=time, 1=S5, 2=S4 (d10)
DI1 config. (o02)
100%
0%
6h
6h
12h
8h
8h
12h
0
1
1
0
1
1
Case cleaning (=10)
Door function (=3)
100%
0%
Sensor signal for display view S4% (017)
Override
The controller contains a number of functions that can be used
together with the override function in the System Manager.
Function via data communication
Functions to be used in the system manager's override function
Used parameter in AK-CC 250A
Start of defrosting
Defrost control
Time schedule
- - - Def.start
Coordinated defrost
Defrost control
- - - HoldAfterDef
- - - Defrost state
Night setback
Day/night control
Time schedule
- - - Night setbck
Light control
Day/night control
Time schedule
o39 Light Remote
22
Manual RS8GC202 © Danfoss 2-2014
AK-CC 250A
Connections
Relays
The general uses are mentioned here. See also page 6 where the
different applications are shown.
DO1: Refrigeration. The relay will cut in when the controller demands refrigeration
DO2: Defrost. The relay will cut in when defrost is in progress
DO3: For either fans or refrigeration 2
Fans: The relay will cut in when the fans have to operate
Refrigeration 2: The relay will cut in when refrigeration step 2
has to be cut in
DO4: For either alarm, rail heat, light or hotgas defrost
Alarm: Cf. diagram. The relay is cut in during normal operation and cuts out in alarm situations and when the controller
is dead (de-energised)
Rail heat: The relay cuts in when rail heat is to operate
Light: The relay cuts in when the light has to be switched on
Hotgas defrost: See diagram. The relay will cut out when
defrost has to be done
Power supply
230 V a.c.
Sensors
S3 and S4 are thermostat sensors.
A setting determines whether S3 or S4 or both of them are to be
used.
S5 is a defrost sensor and is used if defrost has to be stopped
based on temperature.
Digital On/Off signals
A cut-in input will activate a function. The possible functions are
described in menus o02 and o37.
External display
You can connect an external display, but only in standalone application. The display is connected MODBUS input.
Data communication
Fixed MOD-bus.
If data communication is used, it is important that the installation
of the data communication cable is performed correctly.
See separate literature No. RC8AC…
Electric noise
Cables for sensors, DI inputs and data communication must be
kept separate from other electric cables:
- Use separate cable trays
- Keep a distance between cables of at least 10 cm
- Long cables at the DI input should be avoided
Coordinated defrost via
cable connections
The following controllers can be connected
up in this way:
EKC 202D, AK-CC 210, AK-CC 250, AK-CC
450, AK-CC 550
Refrigeration is resumed when all
controllers have “released” the signal for
defrost.
Coordinated defrost via
data communication
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
23
Connecting external display
Only in standalone.
Do not connect anything other than a display on data
communication.
The distance to the display must not exceed 200 m.
An address has to be set in o03 (0 can not be used).
The display will self find the controller address.
Sensor overview
o06
AK-CC 250A:
Pt: Pt 1000 Ω @ 0°C (AKS 11, AKS 12, AKS 21)
P01: PTC 1000 Ω (nominal 990 Ω) = EKS 111
P02: PTC 1000 Ω @ 25°C (nominal 1000 Ω)
°C
30
25
20
15
10
5
0
−5
−10
−15
−20
−25
−30
−35
−40
Pt 1000
@ 0°C
AKS 11,
AKS 12,
AKS 21
Ω
1167.7
1097.3
1077.9
1058.5
1039.0
1019.5
1000.0
980.4
960.9
941.2
921.6
901.9
882.2
862.5
842.7
Carel:
TSH/TST/TSM/
TSQ/PT1
Dixell:
PMG/PMP/PMT
PTC 1000 Ω
KTY81-121
EKS 111
Ω
1029
990
951
914
877
841
807
773
740
708
677
647
617
589
562
Carel:
03/06/015
PTC 1000 Ω
@ 25°C
KTY81-110
Ω
1040
1000
961
923
886
850
815
781
747
715
684
653
624
595
567
Frigo:
VX6
Dixell:
S6
Eliwell:
SN6/SN7
Lae:
ST1K.CP
o06
24
Pt
P01
P02
Manual RS8GC202 © Danfoss 2-2014
AK-CC 250A
Ordering
Type
Function
AK-CC 250A
Refrigeration controller with MODBUS data communication.
For Pt 1000 or PTC sensors
084B8528
EKA 181C
Battery module that will protect the clock in case of lengthy
power failure
084B8577
EKA 182A
Copy key EKC - EKC
084B8567
EKA 163A
External display option for stand alone
084B8562
EKA 164A
External operation option for stand alone
084B8563
AK-CC 250A
Manual RS8GC202 © Danfoss 2-2014
Code no.
25
Data
Supply voltage
230 V a.c. +10/-15 %. 2.5 VA, 50/60 Hz
Sensors 3 pcs off Pt 1000 or PTC
either
Accuracy
Measuring range -60 to +99°C
±1 K below -35°C
Controller
±0.5 K between -35 to +25°C
±1 K above +25°C
Pt 1000 sensor
±0.3 K at 0°C
±0.005 K per grad
PTC
Sensor-determined; please see
data for the relevant sensor.
Display
LED, 3-digits
External display
EKA 163A / EKA 164A
Signal from contact functions
Requirements to contacts: Gold plating
Cable length must be max. 15 m
Use auxiliary relays when the cable is longer
Digital inputs
Electrical connection cable
Max.1,5 mm2 multi-core cable
CE
(250 V a.c.)
DO1.
Refrigeration
10 (6) A
DO2. Defrost
10 (6) A
DO3. Fan
6 (3) A
DO4. Alarm
4 (1) A
Min. 100 mA**
Relays*
Data communication
Environments
Density
UL ***
(240 V a.c.)
10 A Resistive
5FLA, 30LRA
10 A Resistive
5FLA, 30LRA
6 A Resistive
3FLA, 18LRA
131 VA Pilot
duty
4 A Resistive
131 VA Pilot
duty
MODBUS
0 to +55°C, During operations
-40 to +70°C, During transport
20 - 80% Rh, not condensed
No shock influence / vibrations
IP 65 from front.
Buttons and packing are imbedded in the front.
Escapement
reserve for the
clock
4 hours
Approvals
EU Low Voltage Directive and EMC demands re CEmarking complied with
LVD tested acc. EN 60730-1 and EN 60730-2-9, A1, A2
EMC tested acc. EN61000-6-3 and EN 61000-6-2
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products
already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed.
All trademarks in this material are property of the respecitve companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
26
Manual RS8GC202 © Danfoss 2-2014
ADAP-KOOL®
* DO1 and DO2 are 16 A relays. DO3 and DO4 are 8 A relays. Max. load must be kept.
** Gold plating ensures make function with small contact loads
*** UL-approval based on 30000 couplings
AK-CC 250A
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