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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:
Initial state: The start position of the controller is determined using the initial state of the controller. If the controller is
switched off, the basic setting can be used to output a fixed controller position. If operation mode MANUAL has been se-
lected, 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 controlled in a linear manner). On setting the
"STOP" push-button, the analog controller is switched off again.
Parameter 37
Initial state
Frequency = 000%
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 (determina-
tion for abrupt disturbances on the system input); this setting method assumes a pure lag element connected in series with a
first-order lag system.
1.
Controller operated as a P-only controller
= ∞ [screen setting: T
(where T
n
2.
Increase gain K
(P-gain) until K
PR
ATTENTION
If the engine starts to oscillate uncontrollably, carry out an emergency shutdown and alter the screen setting accordingly.
3.
At the same time: measure the critical cycle duration T
4.
Set the parameters:
PID-controller
K
= 0.6
× K
PR
T
= 0.5
× T
n
T
= 0.125 × T
V
Step response
Controller setting
Optimal (xm ≤ 10 %)
x
1
0
0
HB_PCM1x_Packages_Configuration_09.04_GB
Initial frequency controller state
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.
=0], T
= 0).
n
V
= K
when the control loop starts to oscillates continuously.
P
Pkrit
PI-controller
K
= 0.45 × K
Pcrit
PR
T
= 0.83 × T
crit
n
crit
Controller setting
Tcrit
x
1
0
t/s
# EMERGENCY SHUTDOWN $
# #
#
crit
Pcrit
crit
0
t/s
Figure 3-3: Step responds - governor configuration
0 to 100 %
Controller setting
Incorrect
x
1
0
0
$ $
$
t/s
29
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