Eliwell

ID Plus 974

ID Plus Series • Refrigeration Controller

Type Refrigeration

Application Display Case

Probe Inputs 3

Relay Outputs 4

Communication RS485 Modbus

Panel Size 71x29 mm

R1 Compressor

R2 Defrost

R3 Fan

R4 Auxiliary/Alarm

Advanced controller for commercial refrigeration with HACCP logging

Technical Specifications

Display Type	LED
Display Digits	4
Buttons	4
LED Indicators	Compressor, Defrost, Fan, Alarm, Aux

Relay Outputs	4
Relay Rating	8A/250VAC (16A inrush)

Operating Temp	-5 to 55°C
Storage Temp	-25 to 70°C

Terminal	Function	Type	Wire Color
L	Power L (Live)	Input	brown
N	Power N (Neutral)	Input	blue
Pb1	Probe 1 (Room)	Input	red/white
Pb2	Probe 2 (Evaporator)	Input	red/white
Pb3	Probe 3 (Auxiliary)	Input	red/white
DI1	Digital Input 1 (Door)	Input	gray
DI2	Digital Input 2	Input	gray
GND	Digital Input Common	Input	gray
NO1	Relay 1 NO (Compressor)	Output	black
C1	Relay 1 COM	Output	black
NO2	Relay 2 NO (Defrost)	Output	orange
C2	Relay 2 COM	Output	orange
NO3	Relay 3 NO (Fan)	Output	green
C3	Relay 3 COM	Output	green
NO4	Relay 4 NO (Auxiliary)	Output	yellow
C4	Relay 4 COM	Output	yellow
A	RS485 A (+)	Comm	blue
B	RS485 B (-)	Comm	yellow

Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.

Code	Parameter	Range	Default	Description
SET	Setpoint	-50 to 150	5 °C	Temperature setpoint
Hy	Differential	0.1 to 25.5	2 °C	Switching differential
LS	Low Setpoint Limit	-50 to SET	-50 °C	Minimum setpoint limit
US	High Setpoint Limit	SET to 150	50 °C	Maximum setpoint limit
Ot	Probe Calibration	-12.0 to 12.0	0 °C	Room probe offset
OE	Evap Probe Calibration	-12.0 to 12.0	0 °C	Evaporator probe offset
OA	Aux Probe Calibration	-12.0 to 12.0	0 °C	Auxiliary probe offset
dOn	Comp ON Delay	0 to 255	0 min	Compressor startup delay
dOF	Comp OFF Delay	0 to 255	3 min	Minimum compressor off time
dbi	Comp Short Cycle	0 to 255	3 min	Minimum compressor cycle time
dFt	Defrost Type	0-3	1	0=Off, 1=Electric, 2=Hot Gas, 3=Air
dt	Defrost Duration	0 to 255	30 min	Maximum defrost time
dit	Defrost Interval	0 to 255	6 hr	Time between defrosts
dSt	Defrost End Temp	0 to 50	10 °C	Defrost termination temperature
dPO	Defrost at Startup	0=No, 1=Yes	0	Start defrost at power on
FnC	Fan Control	0-3	0	0=Always on, 1=With comp, 2=Thermostat, 3=Always off
Fdt	Fan Delay	0 to 255	0 min	Fan delay after defrost
ALU	High Alarm	SET to 150	15 °C	High temperature alarm
ALL	Low Alarm	-50 to SET	-5 °C	Low temperature alarm
Ady	Alarm Delay	0 to 255	60 min	Alarm activation delay
Adr	Modbus Address	1 to 247	1	RS485 device address