: Controls both the compression and condensation phases by managing compressors and condenser fans simultaneously.
To access advanced parameters (e.g., Probe type PTC/NTC, address for TelevisSystem):
: Some users have reported issues with NTC probe recognition, sometimes requiring specific PTC alternatives depending on the firmware version. Legacy Design
For modern facility management, the device includes an , enabling it to connect directly to Eliwell’s Televis supervision system for remote monitoring and data logging. This allows maintenance personnel to access system variables and adjust parameters without being physically present in the machine room. EWCM 900/S rel. 5/2000 ing compressors and fans manager
Built-in RS-485 serial port supporting Modbus-RTU protocol for integration with Eliwell TelevisSystems or third-party BMS. Advanced Control Algorithms eliwell ewcm 900 s
By regulating suction and discharge pressures, the device ensures that refrigeration plants operate within safe thermodynamic limits while minimizing energy consumption. Key Features and Technical Capabilities 1. Multi-Compressor and Fan Control
Beyond the suction side, the EWCM 900 S manages the high-pressure side of the system. It modulates condenser fans based on floating head pressure control. By lowering the condensing pressure when ambient temperatures drop, the system drastically cuts down total power consumption. 3. Safety and Diagnostic Protections System reliability is backed by safety routines, including: High and low-pressure alarms. Liquid level monitoring. Compressor oil level tracking. Maximum start-per-hour limits to protect compressor motors. Wiring and Installation Best Practices
Program minimum ON times, minimum OFF times, and restart delays for the compressors to protect them from short-cycling and oil starvation. Troubleshooting and Maintenance
Remote alarm connectivity (terminals 1 and 2). : Controls both the compression and condensation phases
The user interface and connectivity of the 900 S also reflect the shift toward the "Internet of Things" (IoT) in industrial settings. Equipped with RS485 ports, the device integrates seamlessly into monitoring systems like Eliwell’s Televis or standard Modbus protocols. This connectivity allows technicians to monitor the health of a refrigeration plant remotely. Instead of waiting for a manual alarm to be triggered by melting ice cream, a remote operator can see a pressure deviation in real-time and dispatch maintenance before the temperature even begins to rise. This proactive capability transforms maintenance from a reactive "firefighting" task into a controlled, predictive process.
Features a global alarm output and dedicated controller breakdown relays, plus 11 optoisolated alarm inputs for enhanced reliability.
Indicates discharge pressure has exceeded safe limits. Check for dirty condenser coils, failed condenser fans, or closed isolation valves.
Features FIFO (First In, First Out), LIFO (Last In, First Out), and runtime-balancing rotation algorithms. This ensures uniform wear across all compressors in the rack. This allows maintenance personnel to access system variables
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I can provide specific parameter steps or troubleshooting paths based on your setup. Share public link
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0…10V or PWM outputs for controlling inverter compressors and variable-speed condenser fans.