TM 9-6115-729-24
0003
DC POWER DISTRIBUTION (FIGURE FO-1, SHEETS 2 AND 3) - Continued
NOTE
Electrically, if the SYNC MODE switch is in AUTO, it does not matter which position the
PARALLEL/ UNIT switch is in.
If the PARALLEL/UNIT switch is set to PARALLEL and SYNC MODE switch set to AUTO, GSC can apply ground
to relay KR by grounding the CLOSE BREAKER output. Auxiliary contacts on K1 latch KR on after KR is
energized.
If the PARALLEL/UNIT switch is set to PARALLEL and SYNC MODE switch is in SEMI-AUTO or PERMISSIVE,
the CLOSE BREAKER output (P7-37) becomes an enable signal. Closing the AC CIRCUIT INTERRUPTER
switch will not apply ground to KR unless the GSC has activated the CLOSE BREAKER output. Auxiliary
contacts on K1 latches KR on after KR is energized. A set of auxiliary contacts on KR energizes K1. During
operation, run relay (RR) A1 K5 is energized until after cool down mode when the GSC opens the electric
governor relay (EGR) on the GSC to stop the engine, then RR is opened also. When ENGINE CONTROL is set
to COOL DOWN/STOP mode, the GSC spare output at P7-36 is grounded and relay CDR (cool down relay) is
energized. The contacts of CDR are in series with relay KR and drop out KR, which drops out K1. The generator
set runs for 5 minutes (programmable) and then shuts down the engine by opening the electric governor relay
(EGR) on the GSC.
The short circuit (SC) and overload (OL) contacts are part of the OL/SC module. In the event the output current
goes above 130% of maximum (overload condition) or 400% of maximum (short circuit condition) the appropriate
contacts will open, de-energizing KR and K1. This will disconnect the load. The GSC directly controls the
Generator Fault Relay (GFR). If the GSC detects a generator fault, the GFR output energizes the GFR relay and
KR and K1 are de-energized, disconnecting the load from Generator G1. The paralleling relay (PAR) is
connected to an auxiliary set of contacts on K1 only when the PARALLEL/UNIT switch is in PARALLEL. Contacts
on the paralleling relay connect Load Sharing Module (LSM) A4 to the paralleling connectors and hence to the
LSM in all other generators in parallel. The press-to-test lamp above the AC Interrupt switch is connected to a set
of auxiliary contacts from K1 to indicate when K1 is energized. A line from this connection goes to a spare input
of the GSC (P7-25) to tell it that K1 is closed.
AC POWER DISTRIBUTION (FIGURE FO-1, SHEETS 4 AND 5)
Generator G1
Generator G1 is a three phase Y-connected generator with two sets of coils. When these coils are placed in
parallel, the generator is capable of 208 Vac phase-to-phase and 120 Vac any phase-to-ground. If connected in
series the generator will put out 416 Vac phase-to-phase and 240 Vac any phase-to-ground. The reconnection
board does this changeover from series to parallel connection. The reconnection board (FO-1, Sheet 4) is shown
pictorially rather that schematically. Note that the references T3, T6, etc. relate to the numbers on the generator
output wires. They are labeled 3, 6, etc correlating with T3, T6, etc. Electrically, T3 is connected to Reconnection
Board TB1 terminal labeled 3, T6 is connected to Reconnection Board TB1 terminal labeled 6, etc. There are
metal bus bars riveted to Reconnection Board TB1 that short between the generator wires in order to connect the
generator coils in parallel for 120/208 mode or in series for 240/416 mode. The bus bars are shown in dotted
lines on the schematic. There is also a bus bar connecting terminals labeled 10, 11, 12, and 13. These are all
connected to the common wire #10 (Ground) and wire 110 coming in and going out of Reconnection Board
TB1.
0003-20
