V2.01
25359_EDEBDA0279-2320-1_EN
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Functional principle
2 Functional Principle of the Controller
The controller's microprocessor records the mains voltage and current consumption of
the entire plant by measuring transformer inputs (A/D converter) and, on the basis of this,
calculates the active and reactive power ratio of the mains. The controller operates in four
quadrants.
Energy recovery in generator operation is detected and indicated by a "G" ashing
on the LCD display. During this time, compensation to cos phi 1.00 (output cos phi) is
performed. To prevent alternating switching operations, this target cos phi is main-
tained for 15 minutes after generator operation.
The compensated power required for the target cos phi is calculated continuously. If the
power dierence corresponds to the set hysteresis (switch-on and switch-o hysteresis),
the stages are switched depending on the required compensation power. Manually
switched stages are, however, not included in the optimization. In case of identical
stages with identical power, the stage that has been switched o for the longest time is
switched on.
Having fewer switching operations results in optimum adjustment. Even for large sys-
tems, sensitive controls can be set up with just a few modules. Stage ratios do not need to
be considered. After compensation, switching operations are interrupted for a cong-
urable time. To prevent alternating switching operations, you can increase the stage
switch-o delay by up to 150% of the smallest stage's power.
In low load operation (secondary measuring current under the limit), the stages are
switched o after the set delay time.
The integrated temperature measurement input monitors the temperature in the reactive
power Compensation system and causes the fan to be switched on if a predened
temperature threshold is exceeded and switched o again when the temperature drops
below the reset temperature.
To prevent the fan from switching unnecessarily often, it has a run-on time of 30 minutes.
You can switch the fan (relay output 6 or 12 depending on the device version) on or o
permanently using the "Stage status" menu. If you select "Auto", the fan output is con-
trolled by the temperature measuring input.
You can also protect the system by dening a switch-o temperature. This makes it pos-
sible to switch stages o in time if there is a risk of damage due to overheating. Once the
temperature drops below the reset temperature, the stages are switched on again one
after the other.
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