Reactive power controller 1-phase

multicomp F144

Reactive power compensation components
multicomp F144 3

The microcontroller-controlled multicomp F144-xxx-3 reactive power controller uses A/D converter inputs to record all grid data relevant to the control of small systems
The reactive power controller is the measuring and control unit of reactive power compensation systems. Precise switching of inductive or capacitive reactive current relieves unnecessarily loaded electrical supply systems and reduces reactive consumption costs.

After calculating the compensation power required to achieve the desired target cos φ, the available capacitor stages are automatically switched on or off with just a few switching operations. The multicomp 144-xxx-3 switches capacitors of the same power in a circuit. Programming is menu-guided via two buttons. System-specific values are stored in a non-volatile memory. Each level can be switched individually using the built-in manual-0-automatic function.

The reactive power controller is also characterized by its functionality in 4-quadrant operation (generator operation), i.e. even when feeding back into the utility grid, missing compensation power is easily detected and compensated. This means that companies’ own generation systems, e.g. biogas or PV systems, can also be easily integrated.

Thanks to the high-quality production and in-house development at our factory in Schwabach, KBR reactive power controllers are characterized by their quality and durability.

Technical data
  • Recognizing and compensating for the missing compensation power even when feeding back into the utility grid
  • Fast compensation with few switching operations
  • Display with two-line LC display, stage status and regeneration
  • Manual-0-automatic switching can be programmed separately for each stage
  • Integrated temperature measurement
  • RS485 interface for Modbus
  • Mixed operation (hybrid circuit) with contactor and thyristor switch


multicomp F144-xxx-3 Reactive power controller

[ 1 ] multicomp F144-xxx-6RO Power factor controller with 6 relay outputs for the operation of choked and unchoked PFC systems
[ 2 ] multicomp F144-xxx-12RO Power factor controller with 12 relay outputs for the operation of choked and unchoked PFC systems
[ 3 ] multicomp F144-xxx-6DO fast-switching power factor controller, 6 optocoupler outputs for dynamic PFC systems with thyristor modules
[ 4 ] multicomp F144-xxx-12DO fast-switching power factor controller, 12 optocoupler outputs for dynamic PFC systems with thyristor modules
[ 5 ] multicomp F144-xxx-6DO6RO Reactive power controller with hybrid circuit, 6 optocoupler and 6 relay outputs for mixed operation of dynamic thyristor modules and capacitor contactors in PFC systems


Switching steps
Relay outputs; 250 VA per output; 250 V AC: 50 / 60 Hz:
[ 1 ] 6
[ 2 ] 12
[3 ] 6 optocoupler outputs
[ 4 ] 12 optocoupler outputs
[5 ] 6 relay and 6 optocoupler outputs
Power per stage [ kvar ] programmable: 0 to 999.9 kVar kap
Discharge times programmable: 0 … 900 sec.
Manual-0-automatic switch | Status display: Standard | Standard
Teach-in function for automatic programming via
Intrinsic current measurement (prerequisite: transformer installed in the supply line to the compensation system)
via main current transformer
Rotating field and phase assignment programmable: Standard
Switching behavior
Self-optimizing: Standard
Circuit of equal stages:
Special switching functions for Group switching
Switch-off limit for low-load operation: programmable
Monitoring functions
Zero-voltage release: Standard
Overcurrent shutdown
(only in conjunction with self-current measurement):
Overvoltage shutdown: firm
Temperature measurement and monitoring with fan control and emergency shutdown: Standard
Harmonic monitoring with alarm signal and emergency shutdown | additional displays: Standard | Voltage: KF – U, 3rd – 13th Harm.
Programmable fault messages: Standard
Target cos φ -monitoring; alarm if not reachable: Standard
Switching operation monitoring with display per stage: Standard
Control status display (over/undercompensation): Standard
Special operating mode
Thyristor quick switch (optocoupler outputs): [ 3 ], [ 4 ], [ 5 ]
Single-phase compensation
Display type: LCD (two lines)
Measured variables (RMS values): UPH-N, UPH-PH, cos φ, fmains, Imain, Stotal, Qtotal, Ptotal, Qtotal demand, temp.
Operating time display:
Measuring accuracy: Voltage | Current | Power 0,5% | 0,5% | 1%
Update speed: 20 ms
Single-phase measurement (4Q): Phase-phase or phase-neutral conductor
Three-phase measurement
4 Quadrant operation* Standard
Long-term memory:
Password protection
By numeric code: Standard
Voltage path: Low voltage; direct measurement: 30 V … 690 V … 790 V AC 50/60 Hz
Medium voltage: 1 V … 99.9 kV programmable
Current path: Main current transformer: 1 x 0.15 A … 5 A … 6 A AC
Intrinsic current transformer:
Frequency range: 50 or 60 Hz
2. setpoint cos φ2 Automatic switchover in the event of power recovery to cos φ=1
Additional relay outputs: Step relay/fan relay
Fault signal relay/fan relay: Fault signal relay
Serial interface with KBR eBus protocol:
Modbus: Modbus RTU
Power supply
Operating voltage: 85-265V AC/DC
Frequency: 50-60 Hz
Power consumption: 12VA
Panel mounting Housing (H x W x D) 144 x 144 x 60 mm
Panel cut-out (H x W) 138 x 138 mm


*4 Quadrant operation: Due to the higher economic weighting of energy costs, more and more self-generation plants are being built. This results in energy being fed back into the supply grid during off-peak periods. All possible conditions regarding the supply and delivery of active and reactive power must therefore be taken into account in the control system. If asynchronous generators are used to generate energy, for example, active power may be fed into the supply grid and reactive power drawn from the supply grid.

Tablet mit Screenshot


More information (brochures, user manuals, etc.) under download.