Shifts the suction setpoint during low-load periods (e.g., night curtains closed on display cases) to prevent short-cycling. 3. Hardware Architecture and Connectivity
The unit uses password protection (parameter Pso ) to prevent unauthorized changes to configuration.
Enter the . Part of the renowned Eliwell "9 Series," this controller represents a benchmark in versatility and power. Unlike basic thermostats, the EWCM 900 S is a sophisticated, programmable multi-purpose controller capable of managing complex systems with ease.
| Specification | Details | | :--- | :--- | | | 230V AC / 50-60Hz (24V AC model available on request) | | Power Consumption | 6 VA | | Dimensions (WxHxD) | 72 x 144 x 120 mm | | Installation | Flush panel mount (67x137 mm cut-out) | | Front Panel Protection | IP65 | | Suction Sensor Input | Programmable for NTC thermistor or 4-20mA pressure transducer (scalable) | | Discharge Sensor Input | Programmable for NTC thermistor or 4-20mA pressure transducer (scalable) | | Relay Outputs | 11 configurable relays, each rated at 6(3)A 250V AC | | Alarm Inputs | 11 opto-isolated inputs (at supply voltage) | | Pressure Switch Inputs | 2 (High/Low pressure for both compressor and fan sections) | eliwell ewcm 900 s
Single units, multi-stage systems, or compressors with varying capacities.
The ability to manage mixed-capacity compressors allows it to be used in various system designs.
Signals a disconnected, shorted, or faulty temperature/pressure sensor. Verify wiring continuity and check probe resistance using a multimeter. Shifts the suction setpoint during low-load periods (e
Typically 230V AC, with some 24V versions available upon request.
Dedicated monitoring for controller failure (terminals 3 and 4). 4. Real-Time Management and Scheduling
The controller features dedicated optoisolated inputs for suction (terminals 5 and 6) and delivery (terminals 7 and 8) pressure stats. Enter the
Safety is a key priority. The controller features alarm circuits combined with each compressor, allowing for immediate notification of high or low-pressure stat faults, motor overloads, or other critical issues.
The strikes a perfect balance between advanced functionality and ease of use. It moves beyond simple on/off switching
The EWCM 900/S is programmed via its built-in keypad and display. The configuration is organized into two levels:
Traditional on/off control for single-stage compressors.