Description

ECB is a compact and configurable digital controller designed for proportional or PI control of single-phase and three-phase EC motors in HVAC/R systems, such as remote condensers, dry coolers and high-efficiency cooling units. It supports a 24 Vac, 230 Vac or 400 Vac (±10%) power supply, with automatic 50/60 Hz frequency selection.

The two independent analog outputs, one for voltage signals 0-10 Vdc and one for current signals 4-20 mA, allow direct control of up to 30 EC motors per output, providing flexible management even in large systems. The outputs are protected against short circuits, ensuring operational safety.

In master mode, ECB features two programmable analog inputs, compatible with 4-20 mA, 0-10 Vdc, 0-5 Vdc signals or 10 kΩ @ 25 °C NTC probes. In slave mode, it accepts 0-20 mA, 4-20 mA and 0-10 Vdc analog signals. The two inputs operate in parallel, with automatic selection of the higher value.

Control can be set to direct or reverse proportional mode, or the PI algorithm can be enabled for more advanced control. Thanks to an optional plug, a second setpoint can also be enabled and selected via an on-off input.

Configuration is simple and intuitive: the inputs are set using DIP switches, while the setpoint is adjusted using two 13-position digital selector switches, SP for the operating point and SP Adj for fine adjustment. This solution makes the selected value clear, repeatable and protected against unintentional adjustments, with a total of 169 selectable operating points. During calibration, the Under SP and Over SP LEDs indicate the position of the measured value in relation to the setpoint, increasing their flashing frequency as the measured value approaches the selected value.

ECB offers four digital inputs for remote Start/Stop, setpoint changeover, reverse operation and activation of the night limit or a fixed speed. It also features seven status LEDs for immediate diagnostics of the power supply status, microprocessor activity, alarms and output control signal level.

The Unlock/Antilock function is also available: in line with the recommendations of leading EC fan manufacturers, it forces the fans to rotate at 40% speed for 1.5 minutes if they remain stopped for 2.5 consecutive hours. ECB is equipped with an alarm relay and is available in IP55 or IP00 versions.

Inputs, outputs and connectivity

Analog inputs: 2 configurable 0-20 mA / 4-20 mA / 0-10 Vdc / 0-5 Vdc / NTC (10 kΩ @ 25 °C, 10 / 60 °C) inputs
On-off digital inputs: 4 inputs for Start/Stop, SP changeover, reverse operation and night limit or fixed speed
Proportional outputs: 2 independent 0-10 Vdc or 4-20 mA outputs (max 30 motors per output, protected)
Relay: 1 relay per alarm (changeover contact)

Special features

PI Mode

Adaptive, accurate control to ensure that the operating parameters remain within the defined setpoint, including with significant load variations.

Setpoint parameters

The device has 1 setpoint (*second setpoint optional) for control with the option to configure customizable parameters, including nighttime limits, fixed speed and maximum and minimum speed.

Double setpoint (optional)

Plug to integrate second setpoint

Safety bypass - Fixed speed

When enabled, the Fixed speed function has absolute priority over the control logic and forces the output to a predefined speed value. This ensures the motors keep running even in the event of measurement errors or out-of-range sensor readings, providing operational continuity under fault conditions.

Fan Unlock/Antilock

The Unlock/Antilock function automatically operates the fans after long periods of inactivity. Enabled by default and disabled via DIP switch, it forces the control output to 40% speed for 1.5 minutes when the fans have not been operated for 2.5 consecutive hours.