MT-543Ri Plus
MT Series • Refrigeration Controller
Quick Info
Output Functions
Three probe controller with auxiliary output and RS485
Technical Specifications
Display & Interface
| Display Type | LED |
| Display Digits | 4 |
| Buttons | 5 |
| LED Indicators | Comp, Defrost, Fan, Aux, Alarm |
Power Supply
| Voltage | 115-230V AC |
| Voltage Range | 90-264V AC |
| Frequency | 50/60Hz |
| Power Consumption | 5VA |
Sensor Inputs
| Probe Inputs | 3 |
| Probe Type | NTC 10K |
| Temp Range | -50 to 105°C |
| Accuracy | ±0.3°C |
Relay Outputs
| Relay Outputs | 5 |
| Relay Rating | 16A/250VAC (comp), 8A (others) |
Physical
| Panel Size | 75x33 mm |
| Depth | 77 mm |
| IP Rating | IP65 (front) |
| Weight | 135 g |
Operating Conditions
| Operating Temp | -10 to 50°C |
| Storage Temp | -20 to 60°C |
Wiring Terminals
| 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
|
| S3 | Probe 3 (Aux) | Input |
red/white
|
| DI | Door Switch | Input |
gray
|
| R1 | Compressor | Output |
black
|
| R2 | Defrost | Output |
orange
|
| R3 | Fan | Output |
green
|
| R4 | Auxiliary | Output |
white
|
| R5 | 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.
Parameter Settings
| Code | Parameter | Range | Default | Description |
|---|---|---|---|---|
| Set | Setpoint | -50 to 105 | -20 °C | Temperature setpoint |
| Hys | Hysteresis | 0.1 to 30 | 2 °C | Differential |
| Of1 | Probe 1 Offset | -10 to 10 | 0 °C | Room probe cal |
| Of2 | Probe 2 Offset | -10 to 10 | 0 °C | Evap probe cal |
| Of3 | Probe 3 Offset | -10 to 10 | 0 °C | Aux probe cal |
| dF | Defrost Type | 0=Off, 1=Elec, 2=Gas | 1 | Defrost method |
| dt | Defrost Duration | 0 to 99 | 45 min | Max duration |
| dI | Defrost Interval | 0 to 48 | 6 hr | Time between |
| St | Defrost End Temp | 0 to 30 | 10 °C | Termination temp |
| Aux | Aux Function | 0-4 | 0 | 0=Light, 1=Heater, 2=2nd comp, 3=Alarm, 4=Door |
| Add | RS485 Address | 1 to 247 | 1 | Modbus address |
Error Codes
Solution: Check probe 1
Solution: Check probe 2
Solution: Check probe 3
Solution: Check refrigeration
Solution: Check setpoint
Frequently Asked Questions
Can be condenser, product, or second room probe
Use Aux parameter to assign function
Alternative Models (Cross Reference)
Manufacturer Information
Brand: Full Gauge
Country: Brazil