Manual 37278B GCP-30 Series - Genset Control
© Woodward Page 33/174
CAUTION
The following must be observed regarding the controller setting:
• Ensure that the emergency shutdown system is operational.
• While determining the critical frequency, pay attention to the amplitude and frequency.
• If the two values change uncontrollably:
EMERGENCY SHUTDOWN
Initial state: The start position of the controller is determined using the initial state of the controller. If the con-
troller is switched off, the basic setting can be used to output a fixed controller position. If operation mode MA-
NUAL has been selected, the initial state signal is output only with the "START" push button. Even when the
analog controller is switched off, the initial state can be freely adjusted (e.g. the speed controller can be con-
trolled in a linear manner). On setting the "STOP" push button, the analog controller is switched off again.
Controller outp.
Init.state= 000%
Initial state 0 to 100 %
The value input in this parameter represents analog controller output setting with
controller switched off. This value is also used as the initial state value.
General settings: The setting rule described below only serves as an example. It cannot be assumed that this is
the proper method of control for your system since every system behaves uniquely.
There are various methods of setting a controller. The setting rules of Ziegler and Nichols are explained below
(determination for abrupt disturbances on the system input); this setting method assumes a pure lag element con-
nected in series with a first-order lag system.
1. Controller operated as a P-only controller
(where T
n
= ∞ [screen setting: T
n
=0], T
V
= 0).
2. Increase gain K
PR
(P-gain) until K
P
= K
Pkrit
when the control loop starts to oscillates continuously.
ATTENTION
If the engine starts to oscillate uncontrollably, carry out an emergency shutdown and alter the screen set-
ting accordingly.
3. At the same time, measure the critical cycle duration T
crit
4. Set the parameters:
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