It is a regulator that works as a voltage controller according to the cut phase principle (control over the three phases) in order to continuously increase and reduce the value of voltage supplied to three-phase AC motors mounted on heat exchangers.


Three-phases power supply: 3ph+PE 400Vac ± 20 % – 50/60Hz (other voltages upon request)
Available controller sizes: 12A, 20A, 26A, 40A, 60A
Operating temperatures -20°C ÷ 50°C
Junction box in thermoplastic UV protected material with protection class IP55
Input by external signal or transducer: 0-20mA, 4-20mA, 0-5V, 0-10V
RS485 Interface for MODBUS networking optional (Plug-in on demand)
Possibility of connection for temperature probes (default) or pressure probes
Auxiliary contacts available:

  • S1: mode direct (default with contact NO) – reverse (contact NC)
  • SP: Selection setpoint 1 or 2 (default SP1 with contact NO,SP2 with contact NC)
  • S5: Night speed limitation (default OFF with contact NO, ON with contact NC)
  • S2: ON – OFF speed control (default ON with contact NO, OFF with contact NC)
  • TK: contact for the connection of the thermal motor protection (default FANS ON with contact NC, FANS OFF with contact NO)

RL1 programmable contact relay of general alarm
Principle of PID regulation. Optional Proportional mode
Setting Min and Max fan-velocity
Possibility to exclude 3 different fan speed fields, excluding areas with high acoustic disturb
Display for main working parameters
Led for power supply fault
Led for motor anomalies
Led for controller faults
Led for indicating special functions