ESY

ESY is a multi functional analog controller designed to operate in master or slave mode, with proportional control output through phase-cut control balanced with the main supply. It is ideal for controlling single-phase, asynchronous motor speeds (class F) installed on axial, radial or centrifugal fans, ensuring accurate, efficient  operation in air-conditioning, refrigeration, heating, ventilation, destratification, thermoventilation and air purifying systems.

Available in 8 A, 12 A, 16 A and 20 A versions, ESY allows the AC power to be continuously adjusted from 0% to 100% on the basis of the differential between the command signal and the setpoint command set in accordance with the predefined limits of operation (minimum/maximum values or cut-off limits).

It has three analog inputs for master mode (two inputs for pressure transducers of 4-20 mA or 0-5 Vdc, an input for an NTC probe of 10 kΩ @ 25 °C) and an analog input of 0-10 Vdc for the slave mode, which enables flexible control and a customized ventilating system. The choice of active signal is made automatically: the controller always detects and uses the signal with the highest value without having to program this.

The controller allows a single or double setpoint to be employed through an optional plug which enables the second setpoint. A specific on-off contact on the board is used for the transfer between the two setpoints to facilitate adjustment of the unit to the variable operating conditions.

A reverse function was also added for operation in both heat pump mode and transfer to full power (100% output) if the command signal is lost, ensuring uninterrupted operation even in emergency situations.

ESY has an 0-10 V or PWM output for more complex applications to drive the slave devices and support the synchronization of a number of units in centralized or spread out architecture.

ESY has protection on the command inputs, protection against power surges  up to 275 Vac, complete galvanic isolation between the network and the signal circuits, a Class B EMC filter and full compatibility with the main earthing systems (IT, TT, TN).

Its versatile architecture and complete range of functions makes ESY a reliable, high-performing solution for fan unit control.

• Analog inputs (master): 2 4-20 mA inputs (or 0-5 Vdc) for pressure transducers + 1 input from NTC probe (10 kΩ @ 25 °C)
• Analog input (slave): One 0-10 Vdc input for proportional external command
• Auxiliary on-off contact: selection of 2 setpoints (requires optional plug)
• Auxiliary output: 0-10 V or PWM signal to drive the slave devices