TM 9-6115-669-13&P
The procedure for switching over from the commercial power converter to an EPP III generator set
is as follows:
Commercial power converter is providing power for the loads.
Generator set 1 or 2 is operating.
Initiate synchronization by pressing button on EPP III PDU control panel.
When voltage and frequency synchronization has been achieved at bus bars of the commercial
power converter and EPP III, power contactor K1 of the EPP III generator set is switched onto
the EPP III bus bars.
The commercial power converter then cuts off power through power contactor K40.
There is no interruption when switching from the EPP III to the commercial power converter or
vice versa. The power distribution unit and bus bars of the commercial power converter are
identical in construction to those of the EPP III. Operating with the commercial power converter
requires two additional control cables:
Cable J6 supplies two phase voltages of the 400 Hz power supply to the commercial power
converter, to determine synchronization.
Cable J20 switches power contactor K40.
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