Main features
- Automatic or manual configuration
- Display of U, I, f, Q, P, S, cosphi, all odd current and voltage harmonics, 1 – 19th harmonics
- Display of the indirectly measured capacitor currents
- Display of the switching cycles per capacitor stage
- Zero voltage triggering within 15 ms
- Nullspannungsauslösung innerhalb von 15 ms
- Degree of reactors in % for each stage, programmable from 0 to 20 %
- Setting of the discharge time for all stages from 0 to 1200 sec.
- Capacitor outputs individually programmable
- Temperature sensor for fan control
- Overtemperature shut-down programmable
- Control of external semi-conductor switching (max. 50 switching operations per second)
- Current transformer input for 1 A; 5 A
- Password protection
- External, changable target cosphi 1 and 2 (except 6R / 6T)
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Fig.: Device rear side Prophi® 12RS
Functional principle
- Single-phase, electronic measurement system
- Acquisition of the active and reactive current portion of the network via the current and voltage circuit
- Reactive power will be calculated with the current from a phase conductor and the voltage between two phase conductors Fig.: Device rear side Prophi® 12RS
- Switching ON or OFF of capacitor stages in the event of deviations in the set power factor
- Switching of capacitors via contactors or semiconductors
- Control via capacitor contactors is implemented in an optimised manner
- Transistor outputs for the near-realtime control of semiconductor switches
Fan control
- Fan control via integrated temperature sensors
- Either via relay outputs or the alarm relay
- Programming of a lower or upper limit temperature necessary
Automatic configuration
- With the “LEARN” function it is possible to learn and save the connection configuration of the power factor controller
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