Volt-free relay contacts assigned to activate compressor contactors, unloader valves, fan contactors, and global alarm indicators. Communication Protocols
is a multi-compressor and fan controller. Its primary function is to maintain a stable suction pressure—and consequently a stable temperature—by cycling compressors on and off or modulating their speed via frequency inverters. Unlike simpler thermostats, the 900 S utilizes sophisticated algorithms to balance the workload across multiple units. This "rotation" logic ensures that no single compressor suffers from excessive wear, thereby extending the mechanical lifespan of the entire rack. By distributing operating hours evenly, the controller minimizes the risk of catastrophic system failure, which is a critical concern in industries where inventory loss can cost thousands of dollars.
The is a specialized controller designed for managing refrigeration machine rooms. It provides comprehensive control for both compressor racks (including single, multi-stage, or variable capacity units) and condenser fans. Key Features & Benefits
To prevent short-cycling and maintain a steady suction pressure, the EWCM 900 S can manage a lead compressor equipped with a frequency inverter or a Copeland Digital Scroll mechanism. The controller modulates the capacity of the lead compressor seamlessly before staging fixed-speed backup compressors. 3. Condenser Dynamic Setpoint (Floating Head Pressure) eliwell ewcm 900 s
: Manages condenser fans based on head pressure to maintain system stability.
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: Each output is linked to an optoisolated digital alarm input to immediately shut down failing components. Eliwell Ibérica Technical Specifications Dimensions : Standard 72x144 mm front panel with a 120 mm depth. Connectivity : Equipped with an RS-485 serial port for integration with the Televis monitoring system : Double 3-digit display that can show readings in Bar, PSI, °C, or °F Power Supply Unlike simpler thermostats, the 900 S utilizes sophisticated
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Sets minimum run times, minimum restart delays (to protect motors from overheating), and rotation logic (FIFO - First In, First Out to equalize running hours). The is a specialized controller designed for managing
: Supports NTC temperature probes or 4…20 mA pressure transducers for both suction and head pressure monitoring.
Input precise minimum downtime and runtime limits according to the compressor manufacturer’s data sheet to safeguard the motor windings.
The "S" variant usually denotes a specific hardware configuration or software suite, often supporting specific probes or output configurations. It is the successor to the iconic EWCM 900 and offers enhanced processing speed and better EMI immunity.