TM 9-6115-730-24
0003
DC POWER DISTRIBUTION (FIGURE FO-1, SHEETS 2 AND 3) - Continued
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 electronic governor relay
(EGR) on the GSC to stop the engine, then RR is opened also. When ENGINE CONTROL is set to
COOL DOWN/STOP, 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 electronic 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 TB1 does this changeover from series to parallel connection. The reconnection board (FO-1, sheet 4) is
shown pictorially rather than 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.
The output of Reconnection Board TB1 goes through several current transformers, relay K1 (shown as a circuit
breaker) and then to Load Connection Board TB2. The coil of K1 is shown on the DC circuits (FO-1, sheet 2 and
sheet 3). There are filters and varisters connected between the outputs and chassis ground. A removable jumper
on the Load Connection Board TB2 connects the chassis ground (which will be externally connected to a
grounding rod) and the neutral line out of the generator.
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