Dixell

XR77CX

XR Series • Refrigeration Controller

Type Refrigeration

Application Multi-Compressor

Probe Inputs 4

Relay Outputs 8

Communication RS485 Modbus RTU/TCP

Panel Size 96x96 mm

R1 Comp1

R2 Comp2

R3 Comp3

R4 Comp4

R5 Unload

R6 Fan

R7 Aux

R8 Alarm

Advanced multi-compressor controller with digital scroll support

Technical Specifications

Display Type	LCD
Display Digits	4
Buttons	6
LED Indicators	Comp1, Comp2, Comp3, Comp4, Unload, Alarm

Relay Outputs	8
Relay Rating	8A/250VAC (x4), 5A/250VAC (x4)

Operating Temp	-10 to 55°C
Storage Temp	-25 to 70°C

Terminal	Function	Type	Wire Color
L/N	Power 230VAC	Input	brown/blue
Pb1	Suction Pressure	Input	4-20mA
Pb2	Discharge Pressure	Input	4-20mA
Pb3	Suction Temp	Input	NTC/PT1000
Pb4	Oil Temp	Input	NTC/PT1000
DI1-4	Comp Status	Input	gray
R1-R4	Compressors 1-4	Output	black
R5	Unloader/Digital Scroll	Output	black
R6	Condenser Fan	Output	black
R7	Auxiliary	Output	black
R8	Alarm	Output	red
A/B	RS485	Comm	yellow/green

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

Code	Parameter	Range	Default	Description
SP	Pressure Setpoint	-1.0 to 50	3.0 bar	Target suction pressure
dF	Neutral Band	0.1 to 3.0	0.5 bar	Dead band
nCP	Number of Compressors	1 to 4	4	Installed compressors
UNL	Unloader Type	0-3	0	0=None, 1=Mechanical, 2=Digital, 3=VFD
ROt	Rotation Mode	0-2	1	0=Fixed, 1=Lead-lag, 2=Runtime balance
ALP	Low Pressure Alarm	-1.0 to SP	0.5 bar	LP alarm threshold
AHP	High Pressure Alarm	SP to 50	25 bar	HP alarm threshold
OIL	Oil Return	0 to 60	30 min	Oil return cycle time