EKC 331
EKC Series • Refrigeration Controller
Quick Info
Output Functions
Suction pressure regulator for multi-compressor rack systems
Technical Specifications
Display & Interface
| Display Type | LED |
| Display Digits | 4 |
| Buttons | 4 |
| LED Indicators | Comp 1, Comp 2, Comp 3, Comp 4, Alarm |
Power Supply
| Voltage | 230V AC |
| Voltage Range | 100-240V AC |
| Frequency | 50/60Hz |
| Power Consumption | 8VA |
Sensor Inputs
| Probe Inputs | 1 |
| Probe Type | Pressure transmitter |
| Temp Range | °C |
Relay Outputs
| Relay Outputs | 6 |
| Relay Rating | 8A/250VAC |
Physical
| Panel Size | 96x96 mm |
| Depth | 75 mm |
| IP Rating | IP65 (front) |
| Weight | 250 g |
Operating Conditions
| Operating Temp | -25 to 55°C |
| Storage Temp | -40 to 70°C |
Wiring Terminals
| Terminal | Function | Type | Wire Color |
|---|---|---|---|
| L | Power L | Input |
brown
|
| N | Power N | Input |
blue
|
| PE | Pressure Sensor + | Input |
red
|
| GND | Pressure Sensor - | Input |
blue
|
| DI1 | HP Cutout | Input |
gray
|
| DI2 | LP Cutout | Input |
gray
|
| K1 | Relay 1 (Comp 1) | Output |
black
|
| K2 | Relay 2 (Comp 2) | Output |
black
|
| K3 | Relay 3 (Comp 3) | Output |
black
|
| K4 | Relay 4 (Comp 4) | Output |
black
|
| K5 | Relay 5 (Unloader) | Output |
orange
|
| K6 | Relay 6 (Alarm) | Output |
red
|
Important: Always disconnect power before wiring. Verify terminal numbers with the actual controller label before connecting.
Parameter Settings
| Code | Parameter | Range | Default | Description |
|---|---|---|---|---|
| r01 | Suction Setpoint | -1 to 34 | 3 bar | Suction pressure setpoint |
| r02 | Neutral Zone | 0 to 5 | 0.5 bar | Control dead band |
| r03 | Stage Diff | 0 to 3 | 0.3 bar | Staging differential |
| c01 | Stage Delay | 0 to 600 | 60 sec | Delay between stages |
| c02 | Min Off | 0 to 30 | 3 min | Minimum off time |
| c03 | Rotation | 0=Off, 1=Time, 2=Hours | 2 | Compressor rotation |
| c04 | Rotation Interval | 1 to 168 | 24 hr | Rotation period |
Error Codes
Solution: Check pressure transducer
Solution: Check condenser and charge
Solution: Check for leaks
Solution: Adjust c01/c02 parameters
Frequently Asked Questions
Set c03=2 for hours-based rotation, c04 for interval
Connect unloader to K5 and configure staging parameters
Alternative Models (Cross Reference)
Manufacturer Information
Brand: Danfoss
Country: Denmark