ML Twin Compressor Controller Installation &

ML Controller
PR0123-TWI
ML Twin Compressor Controller
Installation & User Guide
Resource Data Management
UK OFFICE
Resource Data Management Ltd.
80 Johnstone Avenue,
Hillington Industrial Estate,
Glasgow, Scotland, G52 4NZ, UK
+44(0)141 810 2828
sales@resourcedm.com
US OFFICE
Resource Data Management USA Inc.
100 North 6th Street,
Suite 630B,
Minneapolis, MN 55403, USA
 +1 612 354 3923
 +1 612 208 0922
usasales@resourcedm.com
www.resourcedm.com
ML Twin Controller Installation Guide
Table of Contents:
INTRODUCTION ................................................................................................................................................. 3
Display ................................................................................................................................................................ 3
Relay Modules.................................................................................................................................................... 4
Setting-up ........................................................................................................................................................... 5
Viewing/ Changing Menu Items ........................................................................................................................ 5
Menu Items ...................................................................................................................................................... 5
Inputs and outputs ............................................................................................................................................ 5
Parameter Tables ............................................................................................................................................... 6
Parameter Description ...................................................................................................................................... 7
Over Temperature Alarm ................................................................................................................................. 8
Units ................................................................................................................................................................. 8
Disp. ................................................................................................................................................................. 8
Type ................................................................................................................................................................. 8
ID ...................................................................................................................................................................... 8
RTC .................................................................................................................................................................. 8
Network Configuration ...................................................................................................................................... 9
Network Compatibility ...................................................................................................................................... 9
Network Settings .............................................................................................................................................. 9
IP Communications .......................................................................................................................................... 9
Hub/Switch Type ............................................................................................................................................ 10
SoFt (Software version) ................................................................................................................................ 10
OFSt ............................................................................................................................................................... 10
rLY1 ................................................................................................................................................................ 10
ESC ................................................................................................................................................................ 10
Case Off / Sec ................................................................................................................................................... 11
Monitor Probe .................................................................................................................................................. 11
Trim Heater ....................................................................................................................................................... 11
Relay Assignment ............................................................................................................................................ 12
Relay State and functional operation ............................................................................................................ 12
Front Panel messages..................................................................................................................................... 13
Operation .......................................................................................................................................................... 13
Lead and Lag Compressor Cut-in .................................................................................................................. 13
Lead and Lag Swap Over .............................................................................................................................. 13
Anti-Short Cycle ............................................................................................................................................. 13
Single Compressor Operation ........................................................................................................................ 13
Manual Defrost ............................................................................................................................................... 13
Electric Defrost Cycle ..................................................................................................................................... 14
Gas Defrost Cycle .......................................................................................................................................... 14
Network Alarms ............................................................................................................................................... 15
Network Commands ........................................................................................................................................ 15
View I/O ............................................................................................................................................................. 16
Specification .................................................................................................................................................... 16
General........................................................................................................................................................... 16
Relays ............................................................................................................................................................ 17
PART NUMBERS .............................................................................................................................................. 17
Appendix1: ML Twin Compressor Modbus® address registers .................................................................... 18
REVISION HISTORY......................................................................................................................................... 22
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Introduction
The ML Twin Compressor Controller is a dual stage thermostat with adjustable parameters, incorporating a defrost scheduling timer,
lights control, fan control, trim heater control (with energy saving feature by pulsing trim heater) and an alarm handler. The controller can
be networked back to an RDM Data Manager, see Network Configuration
The main features are: 




















Display with decimal or whole numbers
Dual stage thermostat using on/off relays
Probe 1: Air On Probe
Probe 2: Air Off Probe
Probe 3: Logging Probe or Defrost Probe or Plant Fault
Probe 4: Logging Probe or Defrost Probe or Plant Fault
Programmable parameters
Defrost scheduler (up to 8/day)
Manual defrost (from the display buttons)
Network Defrost schedule option
Fan control relay
High volume Alarm buzzer Installation (Can be switched off)
RS232 output for IP Network connection
Automatic compressor duty rotation
Network Lights timer function
Trim Heater control relay
Remote Trim Heater control
Remote network commands
PT1000, NTC2K, NTC2K25 or 10K probes supported
Case Off or Secondary Setpoint Offset option (linked to the lights schedule).
Degrees C and Degrees F incorporated in one controller
Display
LED’s: Cooling
Fans
Lights
Network
Off
Flashing
Steady
No network attached
Attempting to Log on to network
On-line
Service
Defrost
HACCP
Alarm
Keys
Enter
Up
Down
Defrost
Note: Function keys illuminate when pressed, illumination is turned off 20 seconds
after the key is used. Press and hold the defrost button to force a manual defrost
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Please Note
ML Twin Controller Installation Guide
Relay Modules
The ML controller is supplied in two parts, a panel mount display / control unit and a relay / power supply module in a black ABS
enclosure. The two units are interconnected using the 0.75m lead supplied, the control unit derives its power from the relay module. All
the terminals for power, control relays, networking and temperature probes are contained within the relay module as shown below.
The ML controller can be used with a 230 Vac 50Hz or 110V 60Hz mains supply, the switched mains outputs for the relays are fed by the
relay module so only one mains supply needs to be connected.
5 Relay module with RS232 connector (for connection to an IP Network)
170mm
75mm
70mm
Display
Connection
1A Anti Surge
Fuse
Functional Earth
RS232 Comms.
Connector
Supply Neutral
Temperature
Probe Connector
149mm
Fixing Centre
Relay 5
Relay 4
Relay 3
Relay 2
Relay 1
Supply Earth
157mm
Functional Earth
Note: Middle
connector not used.
Applies to all relays
Supply Live
75mm
70mm
Probe Common
Probe 4 Selectable
Connections
NEUTRALS:
LIVE:
N/C:
N/O:
Supply Neutral connections
Supply Live connections
Relay normally closed contact
Relay normally open contact
Probe Connection Detail
Probe 3 Selectable
Air Off
Air On
Probe Common
!
All relays will output the supply voltage
Note. Earth is a functional earth, not a safety earth
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Please Note
ML Twin Controller Installation Guide
Setting-up
Access to the controller settings can be achieved several ways,




Through the display mounted buttons
Direct access by PC into the RS232 comms port. This requires a software package available on the RDM website
Through the RDM Data Manager.
Across an IP network. (Current controller IP address required)
Viewing/ Changing Menu Items
1.
Press and hold "ENT" and "DOWN" for approximately 3 seconds the display will read "EnT"
2.
Press and release "ENT", the display will indicate "IO" This is the inputs and outputs viewing option
3.
Use the "UP" or "DOWN" keys to cycle round the menu items, press enter at the desired item.
.
Example: pressing enter at “PARA” will allow you to view or change parameters
Note. If menu item "ESC" is entered the controller will escape the set up and revert to normal operation
Menu Items
IO
PArA
Unit
diSP
tyPE
Id
Rtc
Net
hub
SoFt
OFSt
rly1
ESC
Displays the inputs and outputs
View and change parameters
Change the Units (Probe Type)
Change the display
View Controller type
Enter an ID (For IP-L Use)
Real Time Clock
Change the network settings
Selects Hub/Switch (Mercury or ML)
View the software version
Probe Offsets
Inverts the operation of Relay 1
Escape back to normal operation
Inputs and Outputs
Set view parameters
Set view units
Display
Type
Set view ID
Real Time Clock
Network Configuration
Hub/Switch Type
Probe Offset
Invert Relay 1
Inputs and outputs
Selecting this menu option allows the user to view the inputs and outputs. Use the up/down button to select the desired input or output
and then press “Enter”. The value will be shown on the display. See View IO
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Please Note
ML Twin Controller Installation Guide
Parameter Tables
No.
P-15
P-16
P-17
P-18
P-03
P-04
Parameter
Lead Cut-In
Lead Diff
Lag Cut-In
Lag Diff
Control Weight
Probe 3 Type
P-05
Probe 4 Type
P-06
Relay 2 Function
P-07
Relay 4 Function
P-08
Relay 5 Function
P-11
P-12
P-14
P-20
P-21
P-22
P-23
P-24
P-25
P-26
P-40
Trim level
Anti Short Cycle Time
Service Interval
Alarm delay
Under Temp Alarm
Over Temp Alarm
Monitor probe Alarm delay
Monitor probe Under Temp
Monitor probe Over Temp
Alarm buzzer duration
Defrost Mode
P-41
P-45
P-46
Defrost Start Time (Local
mode)
Defrost number (Local
mode)
No Defrost Time
Defrost Termination
Temperature
Defrost Time
Defrost Type
P-47
P-48
P-49
P-50
Drain Down Time
Recovery Time
Fan Delay Time
Fans in Defrost
P-51
P-98
Fan Delay Temperature
Lights Control
P-42
P-43
P-44
Range OC (OF)
-60.0 (-76.0) to +60.0 (140.0)
-60.0 (-76.0) to +60.0 (140.0)
-60.0 (-76.0) to +60.0 (140.0)
-60.0 (-76.0) to +60.0 (140.0)
0 to 100
0 = Off
1 = Monitor
2 = Monitor with Fault
3 = Monitor with Alarm
4 = Defrost term
5 = Plant N/O
6 = Plant N/C
0 = Off
1 = Monitor
2 = Monitor with Fault
3 = Monitor with Alarm
4 = Defrost term
5 = Plant N/O
6 = Plant N/C
0 = Fans
1 = Lights
2 = Trims
3 = Alarm
4 = SLV
5 = Trim Hub
6 = Comp
0 = Fans
1 = Lights
2 = Trims
3 = Alarm
4 = SLV
5 = Trim Hub
0 = Fans
1 = Lights
2 = Trims
3 = Alarm
4 = SLV
5 = Trim Hub
0 to 100
00:00 to 99:00
0 to 128
00:00 to 99:00
-60.0 (-76.0) to +60.0 (140.0)
-60.0 (-76.0) to +60.0 (140.0)
00:00 to 99:00
-60.0 (-76.0) to +60.0 (140.0)
-60.0 (-76.0) to +60.0 (140.0)
00:00 to 61:00
0 = Local
1 = Remote
00:00 to 23:59
0 to 8
Step
0.1
0.1
0.1
0.1
1
1
Units
C (OF)
O
C (OF)
O
C (OF)
O
C (OF)
%
-
Default
3.0 (37.4)
3.0 (5.4)
6.0 (42.8)
3.0 (5.4)
50
0
1
-
0
1
-
6
1
-
1
1
-
2
1
01:00
1
01:00
0.1
0.1
01:00
0.1
0.1
01:00
1
%
mins:secs
KHrs
mins:secs
O
C (OF)
O
C (OF)
mins:secs
O
C (OF)
O
C (OF)
mins:secs
-
100
01:00
60
20:00
-2.0 (28.4)
5.0 (41.0)
20:00
-2.0 (28.4)
5.0 (41.0)
00:00
0
00:01
hrs:min
01:00
1
-
6
Hrs
C (OF)
12
10.0 (50.0)
O
0 to 180
-60.0 (-76.0) to +60.0 (140.0)
1
0.1
00:00 to 99:00
0 = Electric
1 = Gas
2 = Off Cycle
00:00 to 24:00
00:00 to 99:00
00:00 to 99:00
0 = Off
1 = On
-60.0 (-76.0) to +60.0 (140.0)
0 = Off
1 = Case Off
2 = Sec
01:00
1
mins:secs
-
20:00
0
00:15
01:00
01:00
1
mins:secs
mins:secs
mins:secs
-
02:30
30:00
15:00
0
0.1
1
O
O
C (OF)
-
0.0 (32.0)
0
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Please Note
ML Twin Controller Installation Guide
No.
P-81
P-60
Parameter
Sec Offset
Lights Mode
P-61
P-62
P-63
P-64
P-65
P-66
P-67
P-68
P-69
P-70
P-71
P-72
P-73
P-74
Dflt
Sunday On Time
Sunday Off Time
Monday On Time
Monday Off Time
Tuesday On Time
Tuesday Off Time
Wednesday On Time
Wednesday Off Time
Thursday On Time
Thursday Off Time
Friday On Time
Friday Off Time
Saturday On Time
Saturday Off Time
Default Settings
Range OC (OF)
-60.0 (-76.0) to +60.0 (140.0)
0 = Local
1 = Remote
2 = Manual Off
3 = Manual On
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
00:00 to 23:59
Step
0.1
1
00:01
00:01
00:01
00:01
00:01
00:01
00:01
00:01
00:01
00:01
00:01
00:01
00:01
00:01
Units
C (OF)
-
Default
10.0 (50.0)
0
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
hrs:min
08:00
20:00
08:00
20:00
08:00
20:00
08:00
20:00
08:00
20:00
08:00
20:00
08:00
20:00
O
Parameter Description
No.
P-15
P-16
P-17
P-18
P-03
Parameter
Lead Cut-In
Lead Diff
Lag Cut-In
Lag Diff
Control Weight
P-04
P-05
P-06
P-07
P-08
P-11
Probe 3 Type
Probe 4 Type
Relay 2 Function
Relay 4 Function
Relay 5 Function
Trim level
P-12
P-14
P-20
P-21
P-22
P-23
P-24
P-25
P-26
P-40
Anti Short Cycle Time
Service Interval
Alarm delay
Under Temp Alarm
Over Temp Alarm
Monitor probe Alarm delay
Monitor probe Under Temp
Monitor probe Over Temp
Alarm buzzer duration
Defrost Mode
P-41
P-45
P-46
P-47
P-48
P-49
P-50
Defrost Start Time (Local
mode)
Defrost number (Local
mode)
No Defrost Time
Defrost Termination
Temperature
Defrost Time
Defrost Type
Drain Down Time
Recovery Time
Fan Delay Time
Fans in Defrost
P-51
P-98
Fan Delay Temperature
Lights Control
P-42
P-43
P-44
Description
The value above which the controller starts the Lead Compressor.
The value below the set point at which the controller stops the Lead Compressor.
The value above which the controller starts the Lag Compressor.
The value below the set point at which the controller stops the Lag Compressor.
Percentage of Probe 1 temperature that is used to calculate the control temp and display temp.
The remaining percentage will be used on probe 2 temperature.
Example, P-03 set to 30%
Control temp = 30% Probe 1 + 70% Probe 2
This parameter allows the user to change the function of input 3. See Monitor Probe
This parameter allows the user to change the function of input 4. See Monitor Probe
Sets the function of relay 2, defaults to Compressor
Sets the function of relay 4, defaults to Lights
Sets the function of relay 5, defaults to Trims
Sets an On percentage level, of a 5-minute period, to pulse the trim heater relay off/on.
Example: - P-11 set to 40% = 2 minutes On, 3 minutes Off
Time between compressor starts. See Anti-Short Cycle
Service interval time, set to 0 then back to reset. Brings on the service (Spanner) icon when active.
Sets the OT/UT alarm delay
Under temperature Alarm set point.
Over temperature Alarm set point. See Over Temp Alarm
Sets the monitor probe OT/UT alarm delay
Monitor probe Under temperature Alarm set point
Monitor probe Over temperature Alarm set point
Sets the buzzer on duration when an alarm occurs. Set to 00:00 to not use the buzzer.
Defrost mode –
Local Mode : Controller schedules P-41 & P-42
Remote Mode : Front-end schedules.
Defrost start time for local schedule
Number of defrosts per day (local mode)
Starts a defrost if no defrost command has been sent for this duration
Defrosts terminate when the Air Off/Defrost Probe temp reaches this value (See P-04 & P-05).
Defrost duration, unless terminated by P-44
Defrost type, (Gas type keeps the Comp relay/s active).
A period after defrost to allow the draining of any surplus water
Recovery time after defrost, OT alarms are inhibited for this period
Fans remain off until this time has elapsed or fan delay temperature is reached
Fans on or off during defrost; if set to on, they go off at the drain down state and come on after the
fan delay
Fans stay off until this temperature is reached by the Air Off Probe or the fan delay time expires.
Off : Feature not used.
Case Off : Places controller in to Case Off Mode when Lights timer is in the off state.
Sec : Controller operates from a second offset (P-81) when the lights timer is in off period.
See Case Off/Secondary Setpoint
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Please Note
ML Twin Controller Installation Guide
No.
P-81
Parameter
Sec Offset
P-60
Lights Mode
P-61
P-62
P-63
P-64
P-65
P-66
P-67
P-68
P-69
P-70
P-71
P-72
P-73
P-74
Sunday On Time
Sunday Off Time
Monday On Time
Monday Off Time
Tuesday On Time
Tuesday Off Time
Wednesday On Time
Wednesday Off Time
Thursday On Time
Thursday Off Time
Friday On Time
Friday Off Time
Saturday On Time
Saturday Off Time
DFlt
Description
Secondary Offset associated to P-98.
See Case Off/Secondary Setpoint
local : Use the local schedule below. (P-61 - P-74)
Remote : Uses a front-end GP timer.
Sunday On Time
Sunday Off Time
Monday On Time
Monday Off Time
Tuesday On Time
Tuesday Off Time
Wednesday On Time
Wednesday Off Time
Thursday On Time
Thursday Off Time
Friday On Time
Friday Off Time
Saturday On Time
Saturday Off Time
Sets all parameters to their default value
Over Temperature Alarm
P-22. On ML controllers with software version 1.4 and above the alarm will be triggered by the Air Off probe. Previous versions use the
Control Temp.
Units
Use this to select the temperature probe type.
0 = PT1000 (Deg C)
1 = PT1000 (Deg F)
2 = NTC2K (Deg C) (Default)
3 = NTC2K (Deg F)
4 = NTC2K25 (Deg C)
5 = NTC2K25 (Deg F)
6 = NTC10K (Deg C)
7 = NTC10K (Deg F)
Disp.
Display setting: 0 = Decimal display (1 place)
1 = Integer Display
Type
The twin compressor controller has only one type so cannot be changed.
ID
Sets the controller ID, (normally used in conjunction with the IP-L network mode). Set a number in the range of 1 – 999
RTC
Real time clock (This will automatically synchronise on network systems)
a. Use the up or down buttons to scroll through the display until the display reads “rtc”
b. Press enter. The display will show “t-1”. Press enter again
c. Scroll hours up or down (0 – 23) press enter
d. Use up button to select “t-2”, press enter
e. Scroll minutes up or down (0 – 59) press enter
f. Repeat for t-3 (seconds 0 – 59)
g. Repeat for t -4 (Days up to 31)
h. Repeat for t -5 (months up to 12)
i. Repeat for t -6 (Year up to 99)
j. Use up button to display “ESC”, press enter to display “rtc”.
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Please Note
ML Twin Controller Installation Guide
Network Configuration
Network Compatibility
To log the controller onto a network you must first connect the controller to a suitable IP comms module.
Description
IP Futura (Single Mercury to IP Interface)
Mercury IP Switch (IP support for 10 controllers)
Mercury IP Switch with Pressure/Humidity Inputs
ML IP Comms module (Single ML to IP Interface)
ML IP Switch (IP support for 10 controllers)
Mercury IP Switch with Pressure/Humidity Inputs
Part Number
PR0016
PR0018
PR0018-PHI
PR0108*
PR0109*
PR0109-PHI*
When logging the ML controller on to a Data Manager then one of the above communication modules should be used. The ML range of
IP communication modules will soon be obsolete with only spares being made available for replacement purposes. For a limited number
of software versions the ability to communicate with both the Mercury and ML communication modules has been included in the ML
controller software. This revised software will provide compatibility for both ranges for a short time only. Later versions of software will
communicate with Mercury communication modules only. The version of ML controller software which communicates with both Mercury
and ML communication modules is shown below:
Part Number
Description
Controller Software Version and IP Communication Compatibility
PR0123
PR0123-TWI
PR0123-STA
PR0123
PR0123-TWI
PR0123-STA
V2.0–V2.3
V2.0–V2.1
V2.0–V2.1
V2.4 &
Above
V2.2 & Above
V2.2 & Above
PR0108
ML IP Module*



x
X
x
PR0109
ML Hub*



x
x
x
PR0109-PHI
ML Hub PHI*



x
x
x
PR0016
IP Futura






PR0018
Mercury Hub






PR0018-PHI
Mercury Hub PHI






* Note software version of the ML IP Module has to be V1.4 or higher. Software versions older than V1.4 are not supported with the
revised ML hardware platform.
The ML controller has to be set depending on the type of communication module in use. See Hub/Switch Type for further details.
Network Settings
IP Communications
There are 2 ways the ML controller can be used with an IP Ethernet network: 1.
2.
IP-R
IP-L
Remote IP address given by the Data Manager (DHCP Server)
Local IP address and gateway is set up in the controller.
IP-R
To use the ML controller in IP-R mode, you will require either a PR0016 Mercury IP Module or PR0018 Mercury Hub. When either of
these two devices are used, the rotary switches be given a unique setting. Setting 000 must be avoided for IP-R mode.
Once the comms module has been set up and connected to the controller and Data Manager, it will automatically log-on. Once it is
online, the IP address given to the controller can be viewed by pressing enter at the “NET” display. Press enter at any one of the submenu option to read the value
IP1 = IP address field 1
IP2 = IP address field 2
IP3 = IP address field 3
IP4 = IP address field 4
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Please Note
ML Twin Controller Installation Guide
IP-L
To use the ML controller in IP-L mode, you will require either a PR0016 Mercury IP Module or PR0018 Mercury Hub.
The rotary switches must be set to 000 on the comms module or 00 on the Hub.
In this mode the IP address and gateway address must be set up manually in the controller.
Use the following table as a guide: -
Display
Option
IP1
IP Address byte 1
IP2
IP Address byte 2
IP3
IP Address byte 3
IP4
IP Address byte 4
nL
Network Mask Length (see table below)
GT1
Gateway Address byte 1
GT2
Gateway Address byte 2
GT3
Gateway Address byte 3
GT4
Gateway Address byte 4
ESC
Exit network menu. N.B. this option must be selected to save
any changes made in this menu
Setting nL
To ease setup, a single network mask length value is used. If the address has been specified with a network mask value in dotted IP
format e.g. 255.255.255.0 then the table below gives the conversion:
Mask
255.255.255.252
255.255.255.248
255.255.255.240
255.255.255.224
255.255.255.192
255.255.255.128
255.255.255.0
Length
30
29
28
27
26
25
24
Mask
255.255.254.0
255.255.252.0
255.255.248.0
255.255.240.0
255.255.224.0
255.255.192.0
255.255.128.0
255.255.0.0
Length
23
22
21
20
19
18
17
16
Mask
255.254.0.0
255.252.0.0
255.248.0.0
255.240.0.0
255.224.0.0
255.192.0.0
255.128.0.0
255.0.0.0
Length
15
14
13
12
11
10
09
08
The network led will start flashing as the controller is logging on to the network; once logged on, the LED stays on.
Hub/Switch Type
Select the desired value for the type of communication module in use.
0 = Mercury Hub/Switch
1 = ML Hub/Switch
SoFt (Software version)
Press “Enter” at this display to show the software version.
OFSt.
Probe offsets: - select a channel (1 - 4) and select an offset +/- 20 OC (68 OF)
rLY1
Inverts the operation of relay 1 so that the N/O contact can be used.
ESC
Press enter at this display to quit out of the menu.
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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Case Off / Sec
If “Case Off” is selected the controller will enter “Case Off Mode” when the case lights schedule is in the off period. When case lights
schedule is in the on period the controller will follow its normal control operation. This feature is disabled if Temp Cut-In parameter P-01 is
set to 4.0 Degrees or lower.
Warning use with caution: - Case Off places the controller into a state whereby all outputs are off and alarms are inhibited e.g. no
temperature control will occur and no over temperature alarms will be created etc.
If “Sec” is selected the controller will operate to a secondary setpoint, using P-81 (Sec Cut-In), when the case lights schedule is in the off
period. When case lights schedule is in the on period the controller will operate to its normal Temperature set point (P-01).
This feature is disabled if Sec Cut-In parameter (P-81) is set to 4.0 Degrees or lower.
Note: The temperature alarm limits do not change so should be set accordingly.
Monitor Probe
Off
Monitor
Monitor with Fault
Monitor with Alarm
Defrost
Plant N/O
Plant N/C
If selected probe is not used.
If selected, controller will monitor temperature but will not alarm out.
If selected, controller will monitor temperature and alarm out for probe fault but not over or under
temperature.
If selected, controller will monitor temperature and alarm out for probe faults and over and under
temperature alarms.
The selected probe will be used as a defrost termination probe (instead of Air Off probe).
If selected, controller will generate a Plant fault alarm when the probe input sees a short circuit.
If selected, controller will generate a Plant fault alarm when the probe input sees an open circuit
Trim Heater
Trims: If a relay is configured as Trims then the relay will pulse in accordance with P-11 or will be switched remotely by the Data Manager
Trim Control energy feature.
P-11 is used if Trim control is not configured in the Data Manager.
Trim Hub: If the relay is configured as Trim Hub then the relay is pulsed remotely by the ML/Mercury Switch (PR0109-PHI/PR0018-PHI)
Please see the ML/Mercury Switch user documents for further details.
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Relay Assignment
Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
Compressor Note 1
Fans, Lights, Trims, Solenoid Valve, Alarm, Trim Hub or Compressor
Defrost (use the N/O for correct operation)
Fans, Lights, Trims, Solenoid Valve, Alarm or Trim Hub
Fans, Lights, Trims, Solenoid Valve, Alarm or Trim Hub
Note 1: Normally relay 1 operation is from the lower HP switch N/C contact, if the higher HP switch N/O contact is required for normal
operation, then rLy1 option in the menu must be set from it’s default value 0 to 1.
Note: The relay assigned to Trim and/or SLV will indicate the inverse action on the Data Manager value page.
Relay State and functional operation
Relay State:
Relay 1 Off
Relay 1 On
Function State
Compressor 1 On
Compressor 1 Off
Wired contact
N/C
N/C
Relay 2 Off
Relay 2 On
Relay 2 Off
Relay 2 On
Relay 2 Off
Relay 2 On
Relay 2 Off
Relay 2 On
Relay 2 Off
Relay 2 On
Fans On
Fans Off
Lights On
Lights Off
SLV or Trims Off
SLV or Trims On
Alarm Relay = Alarm
Alarm Relay = OK
Compressor 2 On
Compressor 2 Off
N/C
N/C
N/C
N/C
N/O
N/O
N/C
N/C
N/C
N/C
Relay 3 Off
Relay 3 On
Defrost control Off
Defrost control On
N/O
N/O
Fans On
Fans Off
Lights On
Lights Off
SLV or Trims Off
SLV or Trims On
Alarm Relay = Alarm
Alarm Relay = OK
N/C
N/C
N/C
N/C
N/O
N/O
N/C
N/C
Relay 4/5 Off
Relay 4/5 On
Relay 4/5 Off
Relay 4/5 On
Relay 4/5 Off
Relay 4/5 On
Relay 4/5 Off
Relay 4/5 On
Sample Data manager Screen Shot (Fan Delay state after a defrost)
Note: Lights and trims have an extra value to indicate the state (This is the control state, not the relay state)
Relay 2 aliased to Fan Control
Relay 4 aliased to
Lights Control
Relay 4 aliased to Inverse trim
Control
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Front Panel messages
Typical Front Panel messages: -
Display Message
Ft
Prb1
Prb2
Prb3
Prb4
rec
dEF
AL
OFF
System status
Control Fault
Probe 1 Fault
Probe 2 Fault
Probe 3 Fault
Probe 4 Fault
Control State in Recovery
Control Sate in Defrost
Control State in Alarm (Over or Under Temperature)
Controller in Case Off
Operation
Lead and Lag Compressor Cut-in
The Lead compressor will come on when the control temperature reaches Lead Cut-In set point and will go off when the control
temperature reaches the Lead Cut-In set point minus the Lead Diff. The Lag compressor will come on when the control temperature
reaches Lag Cut-In set point and will go off when the control temperature reaches the Lag Cut-In set point minus the Lag Diff. Note
compressor starts are also dependant on the anti-short cycle timer status for the given compressor.
There is a fixed 15 second delay from when the lead compressor starts before the lag compressor is allowed to start i.e. if the control
temperature rises above Lead cut-In and Lag cut-In rapidly, for example after a defrost, then the lag compressor will come on after a 15
second delay from when the lead compressor started. The valve icon on the display will flash when the lead compressor is running and
will be on steady when both compressors are running. The valve icon will be off when both compressors are off.
Lead and Lag Swap Over
The Lead and Lag compressors will swap after every defrost. For example if Compressor 1 is the lead compressor entering into a defrost
then on completion of the defrost Compressor 1 will become the lag compressor and Compressor 2 will become the lead compressor. On
first power up of the controller Compressor 1 will be assigned as the Lead with Compressor 2 being the Lag compressor.
Anti-Short Cycle
Once a compressor starts the anti-short cycle timer will begin to count. If the time entered for the anti-short cycle parameter is exceeded
by the time the compressor is turned off it is immediately available for selection if required. If the time entered for the anti-short cycle
parameter is not exceeded by the time the compressor is turned off then the compressor is not available for use until the remaining anti
short cycle time expires. For example if P-12 is set to 5 minutes and the lead compressor starts and runs for 3 minutes before going off
then the control logic will have to wait 2 minutes before being able to select the lead compressor for use. If the lead compressor is out of
the control logic due to the anti-short cycle timer and there is a cooling demand then the lag compressor can still be utilised providing it is
not violating its anti-short cycle timer. In this instance the Lag compressor would become the Lead and vice-versa until the next defrost.
Single Compressor Operation
If a single compressor is configured then the Lag cut-in and Lag Diff parameters are ignored. Compressor 1 will come on when the
control temperature reaches Lead Cut-In set point and will go off when the control temperature reaches the Lead Cut-In set point minus
the Lead Diff setpoint. In this operational mode the valve icon will be steady on when the compressor is running and off when the
compressor is not running.
Manual Defrost
Press and hold the "#" key for 3 seconds. A manual defrost in accordance with the defrost parameters will be performed (see defrost
page).
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Electric Defrost Cycle
Defrost Termination
Temperature P-51
Fan Delay
Temperature P-49
Control
Temperature
Comp Relay
Termination Time P-45
Drain Down
OR
Termination Temp P-44 Time P-47
Recovery
Time P-48
On
Off
Normal Operation
Fans Relay
Defrost Relay
Normal Operation
On
Fan Delay Time P-49
OR
Fan Delay Temp P-51
Off
On
Off
Gas Defrost Cycle
Defrost Termination
Temperature P-51
Fan Delay
Temperature P-49
Control
Temperature
Comp Relay
On
Off
Normal Operation
Fans Relay
(fans off in
defrost)
On
Fans Relay
(fans on in
defrost)
On
Defrost Relay
Termination Time P-45
Drain Down
OR
Termination Temp P-44 Time P-47
Recovery
Time P-48
Compressor Stays ON
Comp Switches OFF
Normal Operation
Fan Delay Time P-49
OR
Fan Delay Temp P-51
Off
Off
On
Off
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
From normal operation, when the defrost sequence starts, the fans are switched off (if fans are set to off in defrost, P-50) and the LLV
closes. The controller stays in this state until either the termination time (P-45) expires or the termination temperature (p-44) is reached
on the defrost termination or air off probe. The controller then enters the drain down period and the fans are switched off. After the drain
down period, the LLV is switched on and the recovery period starts. After the fan delay period or when the fans termination temperature
drops below the fans set point (P-51), the fans are switched on. Over temperature alarms are inhibited from the start of the sequence to
the end of the recovery time. Recovery ends either when the air off temperature drops below the over temperature alarm level or when
the recovery time expires.
Network Alarms
Alarm text
Missed Defrost
Over Temperature
Under Temperature
Log Over Temperature
Log Under Temperature
Probe 1 Fault
Probe 2 Fault
Probe 3 Fault
Probe 4 Fault
Plant Fault 1
Plant Fault 2
Type # (index)
15
4
5
8
9
6
6
6
6
3
3
Network Commands
Command
Defrost Command
Trim Command
Setpoint Command
Case Off Command
Haccp Command
Value to send
1
0 to 100%
±18OC
5
0
0
1
2
Description
Initiates a defrost cycle
Sets the trim level to this value (Trim period is 5
minutes)
Is added to or subtracted from the setpoint
Sets the controller to Case Off
Restores the controller form Case Off to Normal
Conditions
Defrost mode: remote
Once started defrost terminates on
temperature or time
Selectable Relay 2/4/5 mode: Trim
Heater
This command only works when
parameter P-98 (Lights Control) Is set
to
0 (Off) or 2 (sec) See Note **
HACCP LED OFF
HACCP LED On
HACCP LED Flashes
Note ** When parameter P-98 is set to 1 (Case Off) the lights timer will put the controller into Case Off Mode when the case lights go Off
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
View I/O
Press “Enter” in the menu at “IO” to view the inputs and outputs.
Number
I-01
I-02
I-03
I-04
I-05
I-11
I-12
I-14
O-01
O-02
O-03
O-04
O-05
O-06
O-07
O-08
O-09
O-10
O-30
O-31
I/O
Control Temp.
Probe 1 (Air On)
Probe 2 (Air Off)
Probe 3
Probe 4
Plant 1 Input
Plant 2 Input
Hub Trim Level
Compressor
Relay 2
Defrost Control
Relay 4
Relay 5
Lights
Trims
Fans
Compressor 2
Run Time
Setpoint Offset
Sec Offset
Range (dependant on probe type)
-60.0 to +60.0
-60.0 to +60.0
-60.0 to +60.0
-60.0 to +60.0
-60.0 to +60.0
0 = Off, 1 = On
0 = Off, 1 = On
0 to 100
0 = Off, 1 = On
0 = Off, 1 = On
0 = Off, 1 = On
0 = Off, 1 = On
0 = Off, 1 = On
0 = Off, 1 = On
0 = Off, 1 = On
0 = Off, 1 = On
0 = Off, 1 = On
0 - 128
-60.0 to +60.0
-60.0 to +60.0
Step
Units
0.1
0.1
0.1
0.1
0.1
1
1
1
1
1
1
1
1
1
1
1
1
1
0.1
0.1
O
C
C
O
C
O
C
O
C
O
%
K Hrs
O
C
O
C
Specification
General
Controller Size
Panel Cut-out for Controller
Relay Board Size
Maximum Weight (combined)
Safety (Relay Board)
90 - 270 Vac 10%
50 - 60 Hz 10%
55A
<1A
1Amp anti-surge 20 x 5mm
+5 oC to 50 oC
-20 oC to 65 oC
80% maximum
Indoor use at altitudes up to 2000m, Pollution
Degree 1
Installation Category II.
Voltage fluctuations not to exceed ±10% of
nominal voltage
79mm x 37mm x 73mm WxHxD
72mm x 29mm
170mm x 157mm x 52mm LxWxH
1.25kg
Class II LVD
Safety (Controller)
Class II LVD
EMC
Ventilation
Insulation
EN61326-1 : 2013
No requirement for forced ventilation
Class I for Relay board
Class II for controller
Supply Voltage Range:
Supply Frequency
Maximum Supply Current
Typical Supply Current
Supply Fuse
Operating temperature range
Storage temperature
Operating Humidity
Environmental
Controller only
With relays 1 to 5 fully loaded
With relays 1 to 5 off load
NB – width includes mounting feet
This product is double insulated when
used with the original enclosure
Only use the cable provided to connect
the controller to the relay board.
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Relays
IMPORTANT: Some early versions of Relay modules had relays fitted in position 1 that had a lower N/O contact rating (0.5 HP) Look at
the label on the enclosure lid for the correct Relay rating.
Relay 1 Compressor Relay Note 1
N/O contact 250 Vac / 16A
N/O contact 250 Vac / 2HP
N/C contact 250 Vac / 16A
N/C contact 250 Vac / 1.5HP
Resistive Load
Motor Load
Resistive Load
Motor Load
Relay 2 Selectable
N/C contact 240 Vac / 10A
N/C contact 240 Vac / 3A
N/O contact 240 Vac / 10A
N/O contact 240 Vac / 3A
Resistive Load
Inductive Load CosФ =0.4
Resistive Load
Inductive Load CosФ =0.4
Relay 3 Defrost
N/C contact 240 Vac / 10A
N/C contact 240 Vac / 3A
N/O contact 240 Vac / 10A
N/O contact 240 Vac / 3A
Resistive Load
Inductive Load CosФ =0.4
Resistive Load
Inductive Load CosФ =0.4
Relay 4 Selectable
N/C contact 240 Vac / 10A
N/C contact 240 Vac / 3A
N/O contact 240 Vac / 10A
N/O contact 240 Vac / 3A
Resistive Load
Inductive Load CosФ =0.4
Resistive Load
Inductive Load CosФ =0.4
Relay 5 Selectable
N/C contact 240 Vac / 10A
N/C contact 240 Vac / 3A
N/O contact 240 Vac / 10A
N/O contact 240 Vac / 3A
Resistive Load
Inductive Load CosФ =0.4
Resistive Load
Inductive Load CosФ =0.4
Note 1 Normally relay 1 operation is from the lower HP NC contact, if the higher HP NO contact is required for normal operation, the
relay 1 option in the menu must be set from its default value (0) to 1.
Damage to relays through out of specification usage will invalidate the warranty.
Part Numbers
ML Twin Compressor Controller with 5 Relay, RS232 Comms and Screw Terminals:
ML Twin Compressor Controller with 5 Relay, RS232 Comms and Screw Terminals (100 Units):
ML Twin Compressor Controller with 5 Relay, RS232 Comms and Screw Terminals (20 Units):
PR0123-TWI
PR0123-TWI-50
PR0123-TWI-20
Each of the above units are supplied with a Controller Display, Display Cable, Relay Board and two PR0240 Probes (NTC2K probe type
with a 7 Meter cable)
ML PSU Relay module with 5 Relay, RS232 Comms and Screw Terminals:
ML PSU Relay module with 5 Relay, RS232 Comms and Screw Terminals (100 Units):
ML PSU Relay module with 5 Relay, RS232 Comms and Screw Terminals (20 Units):
PR0127
PR0127-50
PR0127-20
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Appendix1: ML Twin Compressor Modbus® address registers
Register
Name
Min
Max
Unit
Register Type
Item Type
0
Control temp.
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
1
Air On Probe
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
2
Air Off Probe
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
3
Probe 3
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
4
Probe 4
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
5
0 = Unused
Plant Fault 1
1 = OK
2 = Alarm
6
0 = Unused
Plant Fault 2
1 = OK
2 = Alarm
7
Hub Trim Level
0
4096
Compressor
0 = Off
100
%
×1
1 = On
4097
Comp 2
0 = On
1 = Off
4098
Defrost Control
0 = Off
1 = On
4099
Lights
0 = Off
1 = On
4100
Fans
0 = On
1 = Off
4101
Trims
0 = On
1 = Off
4102
Trims
0 = Off
1 = On
4103
Run Time
0
128
K Hrs
3 – Holding
Word
×1
4104
Setpoint Offset
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
3 – Holding
Word
Extend
0 =Stabilise
1 = Normal
2 = Defrost
12288
Control State
3 = Drain Down
4 = Fan Delay
5 = Recovery
6 = Alarm
7 = Case Off
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Register
Name
Min
Max
Unit
Register Type
Item Type
3 – Holding
Word
0 = Normal
1 = Defrost
2 = ElecDf
20480
Defrost Command
3 = DefTerm
4 = Standby
5 = CaseOff
6 = FansOnly
20481
Trim Command
0
100
%
3 – Holding
Word
×1
20482
Setpoint Command
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
0 = Normal
1 = Defrost
2 = ElecDf
20483
Case Off Command
3 = DefTerm
4 = Standby
5 = CaseOff
6 = FansOnly
0 = Off
20484
Haccp Command
1 = On
2 = Flash
0 = Local
20485
EEV Command
1 = Normal
2 = Close
3 = Open
24576
Unused
3 – Holding
Word
24577
Missed Defrost
3 – Holding
Word
24578
Probe 1 Fault
3 – Holding
Word
24579
Probe 2 Fault
3 – Holding
Word
24580
Probe 3 Fault
3 – Holding
Word
24581
Probe 4 Fault
3 – Holding
Word
24582
Plant 1 Fault
3 – Holding
Word
24583
Plant 2 Fault
3 – Holding
Word
24584
Over Temperature
3 – Holding
Word
24585
Under Temperature
3 – Holding
Word
24586
Log Over Temperature
3 – Holding
Word
24587
Log Under Temperature
3 – Holding
Word
8192
Temp Cut-In
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
8193
Temp Diff
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
8194
Control weight
0
100
%
3 – Holding
Word
×1
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Register
Name
Min
Max
Unit
Register Type
Item Type
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
0 = Off
1 = Prb
2 = Prb/Flt
8195
Probe 3 Type
3 = Prb/Alm
4 = Prb/Defrost
5 = PltN/O
6 = PltN/C
0 = Off
1 = Prb
2 = Prb/Flt
8196
Probe 4 Type
3 = Prb/Alm
4 = Prb/Defrost
5 = PltN/O
6 = PltN/C
0 = Fans
1 = Lights
8197
Relay 2 Type
2 = Trim
3 = Alarm
4 = SLV
5 = Trim Hub
0 = Fans
1 = Lights
8198
Relay 4 Type
2 = Trim
3 = Alarm
4 = SLV
5 = Trim Hub
0 = Fans
1 = Lights
8199
Relay 5 Type
2 = Trim
3 = Alarm
4 = SLV
5 = Trim Hub
8200
Trim Level
0
100
%
3 – Holding
Word
×1
8201
Anti SC Time
00:00
99:00
mm:ss
3 – Holding
Word
× 60
8202
Max Run Time
00:00
99:00
mm:ss
3 – Holding
Word
× 60
8203
Service Time
0
128
K Hrs
3 – Holding
Word
×1
8204
OT/UT alarm dly
00:00
99:00
mm:ss
3 – Holding
Word
× 60
8205
Under Temp Alm
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
8206
Over Temp Alm
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
8207
Log Alarm Delay
00:00
99:00
mm:ss
3 – Holding
Word
× 60
z
8208
Log U/T Alarm
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
8209
Log O/T Alarm
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
Extend
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
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ML Twin Controller Installation Guide
Register
Name
Min
Max
Unit
Register Type
Item Type
8210
Alarm Duration
00:00
61:00
mm:ss
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
×1
3 – Holding
Word
×1
8211
Defrost Mode
0 = Local
× 60
1 = Remote
8212
Defrost Start
00:00
23:59
8213
Defrost Number
0
8
8214
No Defrost Time
0
180
Hours
3 – Holding
Word
×1
8215
Def. term. Temp
-60 (-76)
60 (140)
C (F)
3 – Holding
Word
÷ 10
8216
Defrost Time
00:00
99:00
mm:ss
3 – Holding
Word
× 60
8217
Defrost Type
3 – Holding
Word
hh:mm
Extend
0 = Elec
1 = Gas
2 = Off Cycle
8218
Drain down Time
00:00
24:00
mm:ss
3 – Holding
Word
× 15
8219
Recovery Time
00:00
99:99
mm:ss
3 – Holding
Word
× 60
8220
Fan Delay Time
00:00
99:99
mm:ss
3 – Holding
Word
× 60
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
3 – Holding
Word
8221
Fans in Def
0 = Off
1 = On
8222
Fan Delay Temp
8223
Lights Ctrl
-60 (-76)
60 (140)
C (F)
÷ 10
0 = Off
1 = Case Off
2 = Sec
8224
Sec Cut-In
-60 (-76)
60 (140)
C (F)
÷ 10
Extend
0 = Local
8225
Lights Mode
1 = Remote
2 = ManOff
3 = ManOn
8226
Sun Lights On
00:00
23:59
hh:mm
3 – Holding
Word
×1
8227
Sun Lights Off
00:00
23:59
hh:mm
3 – Holding
Word
×1
8228
Mon Lights On
00:00
23:59
hh:mm
3 – Holding
Word
×1
8229
Mon Lights Off
00:00
23:59
hh:mm
3 – Holding
Word
×1
8230
Tue Lights On
00:00
23:59
hh:mm
3 – Holding
Word
×1
8231
Tue Lights Off
00:00
23:59
hh:mm
3 – Holding
Word
×1
8232
Wed Lights On
00:00
23:59
hh:mm
3 – Holding
Word
×1
8233
Wed Lights Off
00:00
23:59
hh:mm
3 – Holding
Word
×1
8234
Thu Lights On
00:00
23:59
hh:mm
3 – Holding
Word
×1
8235
Thu Lights Off
00:00
23:59
hh:mm
3 – Holding
Word
×1
8236
Fri Lights On
00:00
23:59
hh:mm
3 – Holding
Word
×1
8237
Fri Lights Off
00:00
23:59
hh:mm
3 – Holding
Word
×1
8238
Sat Lights On
00:00
23:59
hh:mm
3 – Holding
Word
×1
8239
Sat Lights Off
00:00
23:59
hh:mm
3 – Holding
Word
×1
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
Revision 2.3a
Page 21 of 22
www.resourcedm.com
Please Note
ML Twin Controller Installation Guide
Revision History
Revision
V2.2
V2.2a
V2.3
V2.3a
Date
20/06/2011
06/03/2015
11/05/2015
29/10/2015
Changes
New layout and diagrams
Modbus ® Address Table Added
470R, 700R, 3K, 5K. 6K and NTC10K(2) probe type added
EMC standard updated & Part numbers amended.
Warning
Ensure that all power is
switched off before
installing or maintaining
this product
Revision 2.3a
Page 22 of 22
www.resourcedm.com
Please Note
Download PDF
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