PTG1439-405 Power Factor Control Module


PTG1439-405 Power Factor Control Module (PFC) can minimise the currents caused by reactive losses of power thereby optimising the transfer of energy between generation and loading.

This is becoming more and more important today when “Saving energy” is vital in a world with focus on pollution and shortage of energy.

Field of application

Inductive or mixed inductive and resistive networks in need of compensation, for example when starting and running induction motors as in industrial applications.

Principles of operation

Depending on the power factor of the loading network a microprocessor will connect groups of capacitors.

By measuring phase voltages and current the microprocessor will calculate how many capacitive groups that has to be connected and also in which combinations.

Electrical details

Number of 3-ph groups


Power factor setting

0.7 inductive to 0.7 capacitive

Nominal voltage

3 x 400 V 50 – 60 Hz

Nominal power

0 – 2 kVAr cap.


Automatic or manual

Adjustable delay times, switching sequences and strategies.

Monitoring and

Measurement on the


Voltage, Current and Power factor

Switching modes:

Linear and circular

Indication lamps:

Indication lamps for the capacitor groups which are connected

Physical design

The Power Factor Control Unit is housed in a sturdy apparatus box with a clear mimic diagram explaining how to connect the supplying net from the left to the right side where the network in need for power factor compensation is connected.

Readings, parameters and sub parameters are indicated on the front of the controller. Other settings and programming than the defaults are simply performed from the keyboard and displayed on the controller front.


General data:

Power supply:

1-ph 220 – 240 V, 50 – 60 Hz


510 x 570 x 280 mm


24 kg

Typical Experiments with Terco PFC:

  • The concept of active power, apparent power and reactive power
  • The concept of power factor and cos φ
  • The concept of measuring methods
  • Start current settings (C/k)
  • Delay times
  • Efficiency and losses
  • Linear and circular switching modes
  • PF-Controller design and schematics
  • Programming the controller
  • PF-Controller and resistive/inductive loads
  • PF-Controller and induction motor loads
  • Control range limits