Operation Manual 37107F
MFR 3 - Multi Function Relay
Page 84/165
© Woodward
Three-Position Controller (Setting THREESTEP)
Parameter
80
Power controller
dead band 00.0%
P controller: dead band
0.1 to 25.0 %
In mains parallel operation, the real power is controlled in such a manner, that in its
steady state, the current value does not deviate from the real power set point by
more than the configured percentage value. In this case, the percentage value refers
to the generator rated power (Parameter 28).
Parameter
81
Power controller
gain Kp 00.0
P controller: gain factor
0.1 to 99.9
The gain factor K
P
indicates the power controller gain. By increasing the gain fac-
tor, the response is increased to permit larger corrections to the variable to be con-
trolled. The farther out of tolerance the process is the larger the response action is
to return the process to the tolerance band. If the gain is configured too high, the
result is excessive overshoot/undershoot of the desired value.
Parameter
82
Power controller
band ratio *0.0
P controller: dead band factor
1.0 to 9.9
Once the controller has reached a steady state condition and has not output a
raise/lower pulse for more than 5 seconds, the dead band is increased by the confi-
gured dead band ratio factor.
Example: In the case of an dead band of 2.5 % and a factor of 2.0 the dead band is in-creased after 5 s to
5.0 %. If the control deviation subsequently exceeds 5.0 %, again, the controller's original sensitivity is
automatically reset (2.5 %). This input can be used, in the event of small control deviations, to avoid un-
necessarily frequent actuation processes, thereby protecting the adjustment facility.
