SF-401
SF-4 Series • Refrigeration Controller
Quick Info
Output Functions
Advanced controller with RS485 communication
Technical Specifications
Display & Interface
| Display Type | LED |
| Display Digits | 4 |
| Buttons | 5 |
| LED Indicators | Comp, Def, Fan, Alarm, Comm |
Power Supply
| Voltage | 220V AC |
| Voltage Range | 180-260V AC |
| Frequency | 50/60Hz |
| Power Consumption | 5W |
Sensor Inputs
| Probe Inputs | 3 |
| Probe Type | NTC 10K / PT100 |
| Temp Range | -50 to 150°C |
| Accuracy | ±0.3°C |
Relay Outputs
| Relay Outputs | 4 |
| Relay Rating | 10A/250VAC |
Physical
| Panel Size | 32x74 mm |
| Depth | 70 mm |
| IP Rating | IP65 (front) |
| Weight | 120 g |
Operating Conditions
| Operating Temp | -10 to 55°C |
| Storage Temp | -20 to 60°C |
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| 1-2 | Power 220VAC | Input |
brown/blue
|
| 3-4 | Probe 1 Room | Input |
yellow/white
|
| 5-6 | Probe 2 Evap | Input |
green/white
|
| 7-8 | Probe 3 Aux | Input |
orange/white
|
| 9 | DI1 Door | Input |
violet
|
| 10 | DI2 Ext Def | Input |
gray
|
| 11 | DI Common | Input |
black
|
| 12-13 | RS485 A+/B- | Comm |
orange/yellow
|
| 14-15 | Compressor | Output |
black
|
| 16-17 | Defrost | Output |
red
|
| 18-19 | Fan | Output |
blue
|
| 20-21 | Alarm | Output |
gray
|
Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.
Parameter Settings
| Code | Parameter | Range | Default | Description |
|---|---|---|---|---|
| SP | Setpoint | -50 to 99 | -18 °C | Temperature setpoint |
| SP2 | Night Setpoint | -50 to 99 | -20 °C | Night mode setpoint |
| dF | Differential | 0.5 to 20 | 2 °C | Switching differential |
| dT | Defrost Type | 0=Off,1=Elec,2=Gas | 1 | Defrost method |
| dI | Defrost Interval | 0 to 99 | 8 hr | Defrost interval |
| dn | Defrost Count | 0 to 8 | 4 | Daily defrost count |
| Ad | Address | 1 to 247 | 1 | Modbus address |
| bd | Baud Rate | 9600/19200/38400 | 9600 bps | Communication speed |
Error Codes
Solution: Check room probe
Solution: Check evaporator probe
Solution: Check auxiliary probe
Solution: Close door
Solution: Check refrigeration
Frequently Asked Questions
Set Ad for address, bd for baud rate
Alternative Models (Cross Reference)
Manufacturer Information
Brand: Shangfang
Country: China