V7.00
24905_EDEBD
A0272-5019-1_EN
93
If no induced current measurement has been activated and if the missing compensation
power (to the target Cosphi) is greater than 3 x switching criteria (e.g. 70% of the lowest
stage power) and if several stages are allowed to be switched per cycle, then the times
for the switching gap are reduced to 500 ms, so that stages can be switched quickly (fast
compensation of the missing compensation power).
Example:
Control deviation (missing compensation power)
= 40 kVar
3 x switching criteria (= 3x 7kVar)
= 21 kVar
(e.g. 70% of lowest stage power 10 kVar)
several stages per cycle (Qmax/Step)
= 30 kVar
=> Switching interval is reduced to 500 ms
Stage selection mode:
In the menu switching hysteresis /
N
mode the sequence of switching criteria for the
compensation stages can be changed.
The aim of the sequence of switching criteria is to use the compensation stages as evenly
as possible. The following modes are available (listed according to the sequence of selec-
tion criteria:
Mode 1:
Default after reset to default settings):
•
longest turn-off duration of the compensation stage
•
fewest switching cycles of the compensation stage
•
fewest operating hours (turn-on duration) of the compensation stage
Mode 2:
•
fewest operating hours (turn-on duration) of the compensation stage
•
fewest switching cycles of the compensation stage
•
longest turn-off duration of the compensation stage
System operation