DIGIFAN Fan Speed Controllers (Part 1) | News
DIGIFAN Fan Speed Controllers (Part 1)
13.11.2025. DIGIFAN Fan Speed Controllers (Part 1)
Frigopoint began developing fan speed controllers in 2022, and today the product line fully covers the control of three-phase and single-phase asynchronous fans, as well as permanent magnet EC fans. Control methods range from external 0-10 V/4-20 mA control to liquid line temperature/pressure control.
A brief list of devices with input and output signal characteristics is presented in the table:
The range of fan speed controllers consists of:
FP-FSR-8. A three-phase fan speed controller (380 V) with a maximum permissible operating current of up to 8 A. Its operating principle is based on a decrease in output voltage proportional to the input 0-10 V/4-20 mA control signal. The device can operate in several start/stop modes and also features maximum and minimum fan speed limiting functions.
FP-CPM. Control module for speed controllers and EC fans to maintain condensing pressure. This fully electronic fan speed control module is based on measured liquid line pressure. The proportional control range is 4.5 bar with a hysteresis (to prevent frequent switching) of 1.5 bar and is set by an adjustable setpoint in the range of 5 to 35 bar. The module output signal is 0-10 V, suitable for controlling the FP-FSR-8 controller and EC fans.
FP-CPR1-4. Speed controller for single-phase 230 V fans (with a maximum operating current of 4 A) to maintain condensing pressure. This fully electronic device uses a pressure sensor to measure condensing pressure and generate an output signal with a proportionally reduced input voltage amplitude relative to the adjustable setpoint. The proportional control law is similar to the FP-CPM, i.e., the control range is 4.5 bar with a hysteresis (against frequent switching) of 1.5 bar and is set by an adjustable operating point in the range of 5 to 35 bar. The output signal varies between 0-98% of the input voltage.
FP-ECPR2. Condensing pressure regulator for air conditioning systems (split systems) without a liquid receiver. The regulator measures the condensation temperature and proportionally reduces the output voltage of a single-phase air conditioner fan (230 V, 2 A). The proportional control range is 36 to 41 °C with a hysteresis (against frequent switching) of 2 °C and is a non-adjustable value. At the output, the regulator proportionally reduces the input voltage amplitude in the range of 25 to 99%.
Thus, this line of devices covers most of the challenges encountered in refrigeration system design, both in terms of fan speed control and condensation pressure/temperature regulation.
In the following sections, we will examine each controller in more detail, reviewing basic connection diagrams and tandem operation. Most of the information presented, as well as certificates, can be found in the relevant sections of the technical documentation:
FP-FSR-8 Speed Controller for 3-Phase Fans >>>
FSR-8 Control Module for EC Fans >>>
FP-CPR1-4 Speed Controller for 1-Phase Fans >>>
FP-ECPR2 Condensation Controller for Air Conditioning Systems >>>
Frigopoint began developing fan speed controllers in 2022, and today the product line fully covers the control of three-phase and single-phase asynchronous fans, as well as permanent magnet EC fans. Control methods range from external 0-10 V/4-20 mA control to liquid line temperature/pressure control.
A brief list of devices with input and output signal characteristics is presented in the table:
The range of fan speed controllers consists of:
FP-FSR-8. A three-phase fan speed controller (380 V) with a maximum permissible operating current of up to 8 A. Its operating principle is based on a decrease in output voltage proportional to the input 0-10 V/4-20 mA control signal. The device can operate in several start/stop modes and also features maximum and minimum fan speed limiting functions.
FP-CPM. Control module for speed controllers and EC fans to maintain condensing pressure. This fully electronic fan speed control module is based on measured liquid line pressure. The proportional control range is 4.5 bar with a hysteresis (to prevent frequent switching) of 1.5 bar and is set by an adjustable setpoint in the range of 5 to 35 bar. The module output signal is 0-10 V, suitable for controlling the FP-FSR-8 controller and EC fans.
FP-CPR1-4. Speed controller for single-phase 230 V fans (with a maximum operating current of 4 A) to maintain condensing pressure. This fully electronic device uses a pressure sensor to measure condensing pressure and generate an output signal with a proportionally reduced input voltage amplitude relative to the adjustable setpoint. The proportional control law is similar to the FP-CPM, i.e., the control range is 4.5 bar with a hysteresis (against frequent switching) of 1.5 bar and is set by an adjustable operating point in the range of 5 to 35 bar. The output signal varies between 0-98% of the input voltage.
FP-ECPR2. Condensing pressure regulator for air conditioning systems (split systems) without a liquid receiver. The regulator measures the condensation temperature and proportionally reduces the output voltage of a single-phase air conditioner fan (230 V, 2 A). The proportional control range is 36 to 41 °C with a hysteresis (against frequent switching) of 2 °C and is a non-adjustable value. At the output, the regulator proportionally reduces the input voltage amplitude in the range of 25 to 99%.
Thus, this line of devices covers most of the challenges encountered in refrigeration system design, both in terms of fan speed control and condensation pressure/temperature regulation.
In the following sections, we will examine each controller in more detail, reviewing basic connection diagrams and tandem operation. Most of the information presented, as well as certificates, can be found in the relevant sections of the technical documentation:
FP-FSR-8 Speed Controller for 3-Phase Fans >>>
FSR-8 Control Module for EC Fans >>>
FP-CPR1-4 Speed Controller for 1-Phase Fans >>>
FP-ECPR2 Condensation Controller for Air Conditioning Systems >>>