AGC Designer’s Reference Handbook
DEIF A/S Page 130 of 168
As the drawing indicates, the relays will be fixed on if the regulation deviation is big, and they will be
pulsing if it is closer to the setpoint. In the dynamic range the pulses get shorter and shorter when
the regulation deviation gets smaller. Just before the dead band area the pulse is as short as it can
get. This is the adjusted time ‘GOV ON time’/(’AVR ON time’). The longest pulse will appear at the
end of the dynamic range (45Hz in the example above).
Relay adjustments
The time settings for the regulation relays can be adjusted in the control setup. It is possible to
adjust the ‘period’ time and the ‘ON-time’. They are shown on the drawing below.
Adjustment Description Comment
Period time Maximum relay time The time between the beginnings of two
subsequent relay pulses.
ON time Minimum relay time The minimum length of the relay pulse. The
relays will never be activated for a shorter time
than the ON time.
As it is indicated in the drawing below, the length of the relay pulse will depend on the actual
regulation deviation. If the deviation is big, then the pulses will be long (or a continued signal). If the
deviation is small, then the pulses will be short.
ON ON ON ON
ON
PERIOD PERIOD PERIOD PERIOD PERIOD
t [sec]
Relay ON
HIGH <DEVIATION> LOW
To Next Page
Loading...
Need help?
General
