EWCM 900
EWCM Series • Refrigeration Controller
Quick Info
Output Functions
Case controller for supermarket refrigeration systems
Technical Specifications
Display & Interface
| Display Type | LED |
| Display Digits | 3 |
| Buttons | 4 |
| LED Indicators | Cool, Defrost, Fan, Light, Alarm |
Power Supply
| Voltage | 230V AC |
| Voltage Range | 100-240V AC |
| Frequency | 50/60Hz |
| Power Consumption | 6VA |
Sensor Inputs
| Probe Inputs | 3 |
| Probe Type | NTC 10K |
| Temp Range | -50 to 110°C |
| Accuracy | ±0.5°C |
Relay Outputs
| Relay Outputs | 5 |
| Relay Rating | 8A/250VAC |
Physical
| Panel Size | 71x29 mm |
| Depth | 70 mm |
| IP Rating | IP65 (front) |
| Weight | 140 g |
Operating Conditions
| Operating Temp | -10 to 55°C |
| Storage Temp | -25 to 70°C |
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| 1 | Power L | Input |
brown
|
| 2 | Power N | Input |
blue
|
| 3-4 | Probe Air | Input |
red/white
|
| 5-6 | Probe Evap | Input |
red/white
|
| 7-8 | Probe Cond | Input |
red/white
|
| 9-10 | Solenoid Valve | Output |
black
|
| 11-12 | Defrost | Output |
black
|
| 13-14 | Fan | Output |
black
|
| 15-16 | Light | Output |
black
|
| 17-18 | Alarm | Output |
red
|
| 19 | RS485 A+ | Comm |
yellow
|
| 20 | RS485 B- | Comm |
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 50 | -2 °C | Temperature setpoint |
| Hy | Differential | 0.1 to 25.5 | 2 °C | Switching differential |
| dty | Defrost Type | 0-4 | 1 | 0=Off, 1=Electric, 2=Gas, 3=Off-cycle, 4=Scheduled |
| ndf | Defrosts per Day | 0 to 12 | 4 | Number of defrosts |
| dLt | Defrost Time | 1 to 99 | 30 min | Max defrost duration |
| dtE | Defrost End | -50 to 50 | 8 °C | End defrost temperature |
| FPt | Fan Stop Temp | -50 to SET | -5 °C | Stop fan below this |
| Lig | Light Mode | 0-2 | 0 | 0=Off, 1=On, 2=Scheduled |
| HAL | High Alarm | SET to 50 | 5 °C | High temp offset |
| LAL | Low Alarm | -50 to SET | -30 °C | Low temp threshold |
Error Codes
Solution: Check air probe
Solution: Check evaporator probe
Solution: Check condenser probe
Solution: Check refrigeration
Solution: Check valve/setpoint
Solution: Check heater
Frequently Asked Questions
Yes, designed for multiplexed supermarket racks
Use td1-td12 parameters for defrost times
Alternative Models (Cross Reference)
Manufacturer Information
Brand: Eliwell
Country: Italy
Parent: Schneider Electric