User guide

Revision 2.2 Page 15 of 17
Warning
Please Note
The specifications of the product detailed on this
Set-Up Guide may change without notice. RDM
Ltd. shall not be liable for errors or for incidental
or consequential damages, directly and indirectly,
in connection with the furnishing, performance or
misuse of this product or document.
Ensure that all power is
switched off before
installing or maintaining
this product
ML Twin Controller Installation Guide
www.resourcedm.com
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
Type # (index)
Missed Defrost
15
Over Temperature
4
Under Temperature
5
Log Over Temperature
8
Log Under Temperature
9
Probe 1 Fault
6
Probe 2 Fault
6
Probe 3 Fault
6
Probe 4 Fault
6
Plant Fault 1
3
Plant Fault 2
3
Network Commands
Command
Value to send
Description
Conditions
Defrost Command
1
Initiates a defrost cycle
Defrost mode: remote
Once started defrost terminates on
temperature or time
Trim Command
0 to 100%
Sets the trim level to this value (Trim period is 5
minutes)
Selectable Relay 2/4/5 mode: Trim
Heater
Setpoint Command
±18
O
C
Is added to or subtracted from the setpoint
Case Off Command
5
0
Sets the controller to Case Off
Restores the controller form Case Off to Normal
This command only works when
parameter P-98 (Lights Control) Is set
to
0 (Off) or 2 (sec) See Note **
Haccp Command
0
1
2
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