Deif Multi-line 2 - Page 12

AGC Designer’s Reference Handbook
DEIF A/S Page 12 of 168
Semi-auto mode description
When the generator breaker is closed, the unit will use the nominal frequency as the setpoint for
the speed governor. If AVR control (option D1) is selected, then the nominal voltage is used as
setpoint.
Test mode description
Manual mode description
Block mode description
AMF (with back synchronisation)
Auto mode description
The unit automatically starts the gen-set and switches to generator supply at a mains failure
after an adjustable delay time. It is possible to adjust the unit to change to gen-set operation in
two different ways:
1. The mains breaker will be opened at gen-set start-up.
2. The mains breaker will remain closed until the gen-set is running and the gen-set
voltage and frequency is OK.
In both cases, the generator breaker will be closed, when the generator voltage and frequency is
OK, and the mains breaker is open.
When the mains returns, the unit will synchronise the mains breaker to the busbar, when the
‘mains OK delay’ has expired. Then the gen-set cools down and stops.
Semi-auto description
When the generator breaker is closed and the mains breaker is opened, the unit will use the
nominal frequency as the setpoint for the speed governor. If AVR control (option D1) is selected,
the nominal voltage is used as the setpoint.
When the generator is paralleled to the mains, the governor regulation will be active afterwards.
It will use the setting ‘generator minimum load as the setpoint’ (menu 6523). If AVR control
(option D1) is selected, then the setpoint will be the adjusted power factor (6550 Fixed power
setpoint).
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.
The automatic mains failure mode can be combined with the short time parallel
function. In that case, the generator breaker and the mains breaker will never be
closed at the same time for a longer period than the adjusted ‘short time parallel’
time.