AGC Designer’s Reference Handbook
DEIF A/S Page 16 of 168
Semi-auto mode description
When the generator breaker is closed and the mains breaker is opened, the unit will use the
nominal frequency as setpoint for the speed governor. If AVR control (option D1) is selected, the
nominal voltage is used as setpoint.
When the generator is paralleled to the mains, the generator will be controlled according to the
peak shaving setpoint. So the maximum mains import will not be exceeded in spite of the semi-
auto mode. If AVR control (option D1) is selected, the setpoint is the adjusted power factor
(6550 Fixed power setpoint).
Test mode description
Manual mode description
Block mode description
Load take over
Auto mode description
Back synchronising ON
The purpose of the load take over mode is to transfer the load imported from the mains to the
gen-set for operation on generator supply only.
When the start command is given, the gen-set will start and synchronise the generator breaker
to the busbar that is being supplied by the mains. When the generator breaker is closed, the
imported load is decreased (the power is being transferred to the gen-set), until the load is at the
open breaker point. Then the mains breaker opens.
When the stop command is given, the mains breaker is synchronised to the busbar and after
closure the gen-set is deloaded, cooled down and stopped.
See general semi-auto mode description on page 19.
See general test mode description valid for all gen-set modes on page 20.
See general manual mode description valid for all gen-set modes on page 21.
See general block mode description valid for all gen-set modes on page 21.
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