ECD – Multifunction Digital Control Panel for Single- and Three-Phase EC Fans

ECD is SELPRO's multifunction digital control system combining power supply, speed regulation and protection for single- and three-phase EC fans in one compact IP55 electrical control panel.

Designed for remote condensers, dry coolers and industrial cooling systems, ECD can directly power and control up to 6 EC fans, with a total rated current of 25 A.

By combining motor power outputs, an integrated isolator and control functions, ECD reduces the need to design and build a separate electrical control panel for the fans.

ECD operates in Master mode, providing continuous proportional fan speed regulation via a 0–10 V analogue signal, as well as support for Copeland Digital Scroll systems.

The controller features two configurable analogue inputs for pressure transducers and temperature sensors, automatically selecting the higher measured value. A dedicated NTC input enables winter operation functions.

Built-in capabilities include two independent setpoints, two selectable parameter banks, Night Limit, Heat Pump, Winter Mode and configurable speed limits. Digital inputs allow different operating modes to be selected via external contacts, without requiring a supervisory controller for each function change.

Fan diagnostics are integrated into the control system. Each motor output has a dedicated TK input for monitoring the fan's thermal protection or alarm contact. This enables identification of the affected fan and management of fault indications.

The LCD interface allows setpoints and parameters to be viewed and adjusted directly on the unit. Modbus RTU communication also enables integration with Building Management Systems (BMS).

Thanks to its IP55 enclosure, integrated isolator and electrical protection functions, ECD combines the main power supply and control functions of an EC fan system in a single unit, suitable for new installations and equipment replacement or upgrades.

Power Supply and Electrical Ratings

• Power supply: 100–500 Vac ±10%, 50/60 Hz, single- or three-phase.

• Total rated current: 25 A RMS at 50 °C ambient temperature.

• Maximum current per motor output: 8 A.

• Up to 6 power outputs for EC fans.

• Integrated power isolator.

• Mains overvoltage protection and control input protection.

Control and Operating Functions

• Master operating mode.

• Continuous proportional control via short-circuit-protected 0–10 Vdc output.

• Copeland Digital Scroll system management.

• 2 independent setpoints.

• 2 configurable parameter banks.

• Night Limit for night-time fan speed limitation.

• Winter Mode activated by an NTC temperature sensor.

• Heat Pump operation with direct or reverse control.

• Configurable minimum and maximum speed limits.

Inputs and Outputs

• 2 configurable analogue inputs for pressure and temperature sensors: 0–5 V, 0–10 V, 0–20 mA, 4–20 mA and NTC.

• Automatic selection of the higher measured value.

• 1 additional input for an NTC 10 kΩ sensor at 25 °C, dedicated to auxiliary functions.

• 6 On/Off digital inputs, including 4 with defined functions and 2 for functions available on request.

• 6 TK inputs for individual fan thermal protection or alarm contact monitoring.

• 2 configurable relay outputs for alarms or auxiliary devices.

Diagnostics and Communication

• Individual TK contact monitoring.

• Identification of the fan reporting a fault.

• Digital LCD interface, 2 × 16 characters.

• RS485 Modbus RTU communication for BMS integration.

• Standard non-isolated Modbus interface, with an isolated version available as an option.

Mechanical and Environmental Specifications

• IP55 protection rating.

• Self-extinguishing technopolymer enclosure, UL94-V0.

• Compatible with IT, TT and TN electrical earthing systems.

• Operating temperature: −20 to +50 °C.

• Dimensions: 296 × 247 × 173 mm.

• Weight: 2.5 kg.

ECD is designed for OEM manufacturers, system integrators and installers requiring an integrated solution to power, regulate and protect EC fans in refrigeration and cooling systems.

Main applications include:

• Remote condensers: Proportional EC fan speed regulation according to condensing pressure, with integrated power supply and protection.

• Dry coolers: Fan speed control according to temperature and operating conditions, including seasonal and night-time operating modes.

• Chillers and refrigeration units: EC fan management and integration with equipment control systems, including Copeland Digital Scroll applications.

• Heat pumps: Direct and reverse operating modes, Winter Mode and functions activated by external contacts.

• EC fan groups: Power supply and control for up to 6 single- or three-phase EC fans, with individual TK contact diagnostics.

• New installations and retrofit projects: Installation or upgrading of fan sections using a compact control panel integrating power supply, regulation, isolation and protection.

• Industrial cooling systems: Fan control with supervisory integration via Modbus RTU communication.