S - Eliwell Ewcm 900

: Uses a robust removable screw terminal block matrix to ensure secure connection and easy swapping during servicing.

In an era of smart sensors and IoT platforms, the role of a dedicated, reliable controller like the Eliwell EWCM 900 S might seem less obvious. However, for mission-critical refrigeration, a purpose-built controller is the ultimate fail-safe. Its self-diagnostic system and emergency output are not just features; they are a promise of business continuity, preventing thousands of dollars in lost product when a fault occurs.

Physically, the EWCM 900/S is built to withstand demanding industrial environments. With dimensions of 72x144mm and a depth of 120mm, it comes in a durable black ABS plastic housing and is intended for flush panel mounting with an IP65 front panel rating, which protects against dust and water jets. The front panel displays key data on two separate 3-digit screens for the compressor and fan sections.

The controller displays specific error codes when system anomalies occur. Alarm Code Common Cause Corrective Action Suction probe fault Open or short circuit in pressure transducer Check wiring; replace sensor E2 Discharge probe fault Faulty temperature or pressure sensor Verify sensor resistance HP High pressure alarm Fan failure; blocked condenser; overcharge Clean condenser; check fan relays LP Low pressure alarm Refrigerant leak; blocked filter drier Check system charge; inspect valves tF Thermal overload Compressor motor overheating Verify current draw; check contactors Share public link

: Each compressor is linked to a dedicated alarm circuit, and the controller provides high/low pressure protection.

One of the strongest selling points of the EWCM 900 s is its flexibility. It is not limited to a single type of operation. It can be configured for:

Even the most reliable controllers can encounter issues. Here is a quick troubleshooting guide.

: Typically operates on 230V AC (with 24V available upon request).

Seamlessly integrates with variable speed drives (inverters) on the lead compressor to provide step-less capacity control.

Standard DIN rail installation (4 DIN modules) for clean control panel integration.

and 11 optoisolated alarm inputs Sensors

The true power of the lies in its configuration menu. To access parameters:

The controller recognises and manages three primary styles of compressor plants:

I can adjust the technical depth and tone based on your specific needs!

Proper installation is critical for safe and reliable operation. The EWCM 900/S uses a screw terminal block for all wiring (cable cross-section up to 2.5 mm²). Some key requirements include:

The device features a dual 3-digit display on the front panel. The top display typically shows suction line data, while the bottom display shows condensing data or parameter menus. EWCM 900/S rel. 5/2000 ing compressors and fans manager