Manual 37143A
MFR 15 - Protection Relay & Control
© Woodward
Page 53/119
Power controller
Sens.red. *0.0
Active power controller dead band reduction
1.0 to 9.9
The dead band is increased by the factor configured here to further reduce wear on
speed control, automatic voltage regulator and the output contacts. The dead band
will only be increased by the configured factor after the control has not issued a
raise/lower pulse for 5 seconds.
Example:
If a dead band is configured as 2.5% and the reduction factor is configured as 2.0,
the dead band will be increased to 5.0% after 5 seconds. If the load deviates from
the configured set point by more than 5.0% of the generator rated power, the dead
band is reduced back to 2.5%. This dead band reduction factor can be utilized to
reduce wear on the speed controls due to small load changes.
Power controller
Time pulse>000ms
Minimum active power controller duty cycle
20 to 250 ms
The minimum duty cycle for the active power controller raise/lower contacts
should be configured so that the speed controller is able to respond reliably to the
command issued. It is recommended that the shortest possible time period for this
duty cycle be configured to ensure optimum control behavior.
Power controller
Gain Kp=00.0
Active power controller gain factor
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 active power con-
trol. The farther out of tolerance the active power is the larger the response action is
to return the active power to the tolerance band. Excessive overshoot/undershoot of
the desired value will result if the gain is configured too high.
Analog Controller Outputs (
Option QF
– Instead of Three-Position Controller)
Pr.-sensitivity
Power Kpr=000
Active-power controller P gain
1 to 240
The proportional coefficient specifies the gain (see analog controller).
Reset time
Power Tn=00,0s
Active-power controller reset time
0.2 to 60.0 s
The reset time T
n
identifies the I part of the PID controller (see analog controller).
Deriv. act. time
Power Tv=0,00s
Active-power controller derivative-action time
0.0 to 6.0 s
The derivative-action time T
V
identifies the D part of the PID controller (see analog
controller).
Part-Load Warm-Up
Warm up load
Setpoint 000%
Warm up partial load limit
5 to 110 %
If the engine requires a warm-up period, a fixed load value may be entered for the
engine warm up period. The setting for the generator load that is to be utilized dur-
ing this warm-up phase is defined by this parameter. The fixed load is a percentage
of the generator rated power (refer to page 45).
Warm up load
Time 000s
Warm up period
0 to 600 s
The length of the warm-up period with the part-load following the initial closure of
the GCB in mains parallel operation is configured here. If an engine warm-up pe-
riod is not desired, this parameter must be set to zero.
