Relay adjustments
The time settings for the regulation relays can be adjusted in the control setup. It is possible to adjust the
“GOV period time” and the “GOV ON time”.
As it is indicated in the drawing below, the length of the relay pulse will depend on the actual regulation devia-
tion. If the deviation is big, the pulses will be long (or a continued signal). If the deviation is small, the pulses
will be short.
"GOV ON time" test
When adjusting the “GOV ON time”, it is important to know how big a change in frequency the setting causes.
If it is set too high, there is a risk that the frequency is adjusted past the deadband, which will result in unsta-
ble regulation.
In manual mode, the “GOV ON time” can be tested by enabling menu 2605. When doing so, the GOV up
relay will be activated once for the duration of the “GOV ON time”.
Menu 2605 is automatically reset to OFF.
Signal length
The signal length is calculated compared to the adjusted period time. In the drawing below, the effect of the
proportional regulator is indicated.
GPC-3 DRH 4189340587 UK PID controller
DEIF A/S Page 109 of 122
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