Full Gauge

MT-530Ri

MT-530 Series • Refrigeration Controller

Type Refrigeration

Application Cold Room

Probe Inputs 2

Relay Outputs 3

Communication RS485

Panel Size 32x74 mm

R1 Compressor

R2 Defrost

R3 Fan

Professional cold room controller with RS485 Modbus communication

Technical Specifications

Display Type	LED
Display Digits	3
Buttons	4
LED Indicators	Compressor, Defrost, Fan, Alarm, Comm

Relay Outputs	3
Relay Rating	10A/250VAC

Operating Temp	-10 to 50°C
Storage Temp	-20 to 60°C

Terminal	Function	Type	Wire Color
L	Power L	Input	brown
N	Power N	Input	blue
S1	Probe 1 (Room)	Input	red/white
S2	Probe 2 (Evap)	Input	red/white
DI1	Digital Input 1	Input	gray
DI2	Digital Input 2	Input	gray
GND	DI Common	Input	gray
R1	Relay 1 (Comp)	Output	black
R2	Relay 2 (Def)	Output	orange
R3	Relay 3 (Fan)	Output	green
A+	RS485 A+	Comm	yellow
B-	RS485 B-	Comm	green

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 105	0 °C	Temperature setpoint
Hys	Hysteresis	0.1 to 30	2 °C	Differential
dF	Defrost Type	0=Off, 1=Elec, 2=Gas	1	Defrost method
dt	Defrost Duration	0 to 255	30 min	Max duration
dI	Defrost Interval	0 to 24	8 hr	Time between
DI1	DI1 Function	0=Off, 1=Door, 2=Alarm	1	Digital input 1
DI2	DI2 Function	0=Off, 1=Defrost, 2=Alarm	1	Digital input 2
Add	Modbus Address	1 to 247	1	Network address
bAu	Baud Rate	0=9600, 1=19200	0	Communication speed