Operating instructions
multicomp
Page 2 of 29
Version 1.00
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1
Controller functional principle
The controller's micro processor acquires the supply voltage and the current consumption of the downstream
facility via measuring transformer inputs (A/D transformer) and calculates the active and reactive power ratios
of the network. The controller operates based on a 4 quadrant operation.
•
Energy recovery in generator operation is recognized and displayed (the LCD shows a flashing
„
G
”). During this time, compensation to CosPhi 1.00 (recovery CosPhi) will be performed. To avoid
alternating switching operations when switching between recovery and consumption,
compensation to the recovery CosPhi is performed for 15 minutes when recovery is detected.
During this period of time, the set target-CosPhi is disabled.
The compensation power required for the target CosPhi is calculated continuously. If the power difference
corresponds to the set hysteresis (switch on and off hysteresis), the staged switching is performed in
accordance with the compensation power required. Manually switched stages, however, are not included in the
optimization. In case of identical stages with identical power, the stage disconnected for the longest time is
connected.
With only a few switching operations an optimal adjustment is obtained. Even for large facilities, sensitive
controls may be set up with only a few modules. No stage ratios need to be considered. After compensation,
switching operations are interrupted for a programmable time. In order to avoid alternating switching
operations, the stage switch off hysteresis can be increased to up to 150% of the lowest stage power.
For light load operation (secondary measurement current under the limit (< 20mA), the stages are switched off
after 1 hour.
The programmed values are saved on an EEPROM and will thus not be lost after a network failure.
The measuring cycle of the controller for recording the necessary network parameters takes approx. 20 ms.
In case of failure, the compensation stages are switched off and "overvoltage" is displayed.
b
Note!
Limiting value for overvoltage switch-off = nominal v 10%
(taking into account the measurement voltage transformer ratio).
The value of 10% is unchangeable and serves the safety of the
compensation facility
The reset hysteresis is 1% of the rated voltage.
