multicomp F144-xxx-3 - Reactive power controller

6- or 12-stage
Interface; Modbus

Blindleistungsregler multicomp F144-3

Single-phase reactive power controller - multicomp F144-xxx-3

The microcontroller-controlled multicomp F144-xxx-3 records all network data relevant to the control of small systems via A/D transformer inputs. After calculating the required compensation power to achieve the desired target cos φ, the available capacitor stages are automatically switched on or off with a few switching operations. Programming is menu-assisted and is performed with two buttons. System-specific values are stored in a non-volatile memory. Each stage can be switched individually via the built-in manual-0-automatic function.


  • Detecting and compensating for the missing compensation power in case of recovery into the energy provider network
  • Rapid compensation with few switching operation
  • Display with two-line LC display, stage status an recovery
  • Manual-0-automatic switch separately programmable for each stage
  • Integrated temperature measurement

Technical data



 multicomp F144-xxx-3 Reactive power controller

 [ 1 ]

multicomp F144-xxx-6RO Reactive power controller with 6 relay outputs for the operation of detuned and undetuned PFC systems

 [ 2 ]

multicomp F144-xxx-12RO Reactive power controller with 12 relay outputs for the operation of detuned and undetuned PFC systems

 [ 3 ]

multicomp F144-xxx-6DO Reactive power controller, 6 optocoupler outputs for dynamic thyristor modules

 [ 4 ]

multicomp F144-xxx-12DO Reactive power controller, 12 optocoupler outputs for dynamic thyristor modules

 [ 5 ]

multicomp F144-xxx-6DO6RO Reactive power controller works with hybrid switching, 6 relay- and 6 optocoupler outputs


[ 1 ] F144-MS-1V1C1TI6RO

[ 2 ] F144-MS-1V1C1TI12RO

[ 3 ] F144-MS-1V1C1TI6DO

[ 4 ] F144-MS-1V1C1TI12DO

[ 5 ] F144-MS-1V1C1TIDO6RO


Switching stages

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- und 6 Optocoupler outputs

Power per stage [ kvar ] programmable: 0 to 999.9 kVar cap.  
Discharge times programmable: 0 ... 900 sec.  
Manual 0 automatic switch | status display: Standard | Standard  
Learning function for automatic programming by induced current measurement (requirement: transformer fitted into the cable to the compensation unit) via main current transformer  
Rotary field and phase allocation programmable Standard  
Switching performance
Self-optimizing | Circular switching of equal stages: Standard | -  
Special switching functions for Multiple series connection  
Switch-off limit for low load operation: programmable  
Monitoring functions
No-voltage trigger: Standard  
Overcurrent switch-off (only in connection with induced current measurement) -  
Overvoltage switch-off fixed  
Excess current switch-off
(only in connection with induced current measurement):
Overvoltage switch-off: fixed  
Temperature measurement and monitoring with fan control and emergency shut-down: Standard  
Harmonics monitoring with alarm message and emergency shut-down | additional displays: Standard | Voltage: KF – U, 3rd – 13th harmonic  
Error messages programmable: Standard  
Target cos φ monitoring; alarm if unreachable: Standard  
Switching operation monitoring with display per stage: Standard  
Controller status display (over / undercompensation): Standard  
Special operating mode
Thyristor fast circuit breaker (optocoupler outputs): [ 3 ], [ 4 ], [ 5 ]  
Single-phase compensation -  
Display type: LCD  
Measuring parameters (RMS values | RMS):

U PH-N , U PH-PH , cos φ, f network , I main , Stotal, Qtotal,
Ptotal , Q total demand, temp.

Operating time display: -  
Measurement accuracy:  Voltage | current | power 0,5% | 0,5% | 1%  
Update speed: 20ms  
Single phase measurement (4Q): Phase-phase or phase-neutral  
3-phase measurement -  
4-quadrant operation* Standard  
Long-term memory: - -
Password protection
With digit 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
  Induced current transformer: -
Frequency range:   40 to 70 Hz
2. Target value cos φ2

Automatic switchover in case of energy recovery

to cos φ = 1

Additional relay outputs: Standard  
error message relay/fan relay: error message relay  
Serial interface with KBR eBus protocol: -  
Modbus: Modbus RTU  
Power supply
Operating voltage: 85 – 265 V AC / DC  
frequency: 50  – 60 Hz  
power consumption: max. 15 VA, 9 W  
Switchboard installation: Housing (H x W x D) 144 x 144 x 60 mm
  Switchboard cutout (H x W) 138 x 138 mm

*4-quadrant operation: As energy costs are becoming increasingly important economically, more and more distributed power generation plants will be set up. During low-load periods, this can result in energy being fed back into the supply network. Therefore, all possible states concerning consumption and the provision of active and reactive power must be taken into account for the control system. For example, if asynchronous generators are used to generate energy, active power may be fed into the supply network and reactive power taken from the supply network.


multicomp F144-MS-1V1C1TI6RO/12RO-3 – Reactive power controller with 6 or 12 relay outputs

Operating instructions - multicomp F144-MS-1V1C1TI6RO/12RO-3 (1079 KB)

multicomp F144-MS-1V1C1TI6DO/12DO-3 – Reactive power controller, 6 or 12 optocoupler outputs

Operating instructions - multicomp_F144-MS-1V1C1TI6DO/12DO-3 (1075 KB)

multicomp F144-MS-1V1C1TI6RO6DO-3 – Reactive power controller, 6 relay- and 6 optocoupler outputs

Operating instructions - multicomp F144-MS-1V1C1TI6RO6DO-3 (1010 KB)


Reducing energy costs by reactive power compensation

"Reducing energy costs by reactive power compensation"

Components for reactive power compensation

KBR-Catalogue - Components for power compensation