Schrack Technik CX plus Series FRACXP06R-, User Manual

Page: 33 / 80

33
300 S
ETTINGS CONTROL
CONTAINS SETTINGS IN ORDER TO ADJUST THE CONTROL TO
THE SYSTEM REQUIREMENTS AND TO OPTIMISE IT.
300 Settings control
MENU FUNCTION RANGE
301 Control sensitivity
55…100 %
The control sensitivity indicates the switching threshold for switching stages
on and off. A low value allows a more exact compensation result. As a result,
however, the possibility increases that the control tends to oscillate.
The value can be set in the range of 55% - 100%. The factory setting is 60%.
This means, if the missing reactive power for the control target is greater
than 60% of the stage power, the stage may be switched on resp. off. In this
case, 40% of overcompensation is allowed after switching on resp. 40% of
under-compensation is allowed after switching off.
302 Target COS

1 0.70 c...0.70 i
The active power factor, which shall be reached by the reactive power
compensation (control target), is determined by setting the target
cos

1.
303
Target COS

2
0.70 c...0.70 i
The active power factor, which shall be used as control target, is determined
by setting the target cos

2, if P export (SETUP/304 = YES) was identified
or if the digital input switches to low rate.
304 Target COS

2 in case of P export Yes/No
“
YES
” the controller uses the target cos

2 as control target in case of P
export.
“
NO
” the controller works with the target cos

1 in case of P export.
305 Switching time
1…6500 s
The switching time refers to the waiting time between switching individual
stages in the normal control algorithm. This value should be adjusted
respectively.
The switching time should be set based on the following aspects:
1. The switching time shall protect the contactors against an
unnecessary amount of switching operations and thus against a too
rapid wear.
2. The need for reactive power is determined via the switching time.
Fast fluctuations of the reactive power are compensated in the
process.
306 Switching time stage exchange
1…6500 s
This refers to the waiting time between switching off an active stage and
switching on a stage which fits more precisely to the determined need for
reactive power. The normal switching time is not observed for the stage
exchange.
307 Activate stage exchange Yes/No
“
YES
”: The controller tries to reach the control target more accurate by
exchanging various stages.
“
NO
”: The function is deactivated.