Woodward GCP-20 Series User Manual

Manual 37128A GCP-20 Series - Genset Control
© Woodward Page 83/190
Power Factor Controller [GCP-21/22]
Parameter 54
Pow.fact.contr.
ON
Power factor controller: activation ON/OFF
ON................ In a mains parallel operation automatic control of the power factor is
carried out. If there are excessively low currents (secondary current
less than 5 % I
rated
) the power factor cannot be accurately measured.
In order to prevent power swings, the controller automatically locks
the power factor at a set value. The subsequent screens of this func-
tion are displayed.
OFF.............. Power factor control is not performed, and the subsequent screens of
this function are not displayed.
Parameter 55
Pow.fact.contr.
setpoint 0.00
Power factor controller: set point i0.70 to 1.00 to c0.70
The desired power factor may be configured here so that the reactive power is
regulated in the system. The designations "i" and "c" stand for inductive/lagging
(generator overexcited) and capacitive/leading (generator underexcited) reactive
power. This set point is active only in mains parallel operation.
Three-Position Controller (Standard)
Parameter 56
Pow.fact.contr.
dead band 00.0%
Power factor controller: dead band 0.5 to 25.0 %
The control automatically calculates the amount of reactive power which belongs to
the power factor ϕ
setpoint
. In a mains parallel operation, the reactive power is con-
trolled in such a manner in its regulated state that the actual value does not deviate
from the generator power factor set point value by more than the percentage value
of the sensitivity setting. In this case, the percentage value refers to the generator
rated power.
Parameter 57
Pow.fact.contr.
Gain Kp 00.0
Power factor controller: gain 0.1 to 99.9
The gain factor K
p
influences the operating time of the relays. By increasing the
gain, 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.
Analog controller (Option Qu)
Parameter 58
Pow.fact.contr.
Gain Kpr 000
Option Qu only
Power factor controller: P gain 1 to 240
The proportional coefficient specifies the gain. By increasing the gain, the response
is increased to permit larger corrections to the variable to be controlled. 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 59
Pow.fact.contr.
Reset time 00.0s
Option Qu only
Power factor controller: reset time 0.0 to 60.0 s
The reset time T
n
identifies the I portion of the PID loop. The reset time corrects for
any offset (between set point and process variable) automatically over time by
shifting the proportioning band. Reset automatically changes the output require-
ments until the process variable and the set point are the same. This parameter per-
mits the user to adjust how quickly the reset attempts to correct for any offset. The
reset time constant must be greater than the derivative time constant. If the reset
time constant is too small, the engine will continually oscillate. If the reset time
constant is too large, the engine will take to long to settle at a steady state.

Woodward GCP-20 Series Specifications

General

Brand	Woodward
Model	GCP-20 Series
Category	Control Unit
Language	English