TM 55-1930-209-14&P-9-1
k
Make sure switchboard GENERATOR status lights (Figure 2-14) for operating generator indicates it is running
and its circuit breaker is closed.
CAUTION
With only SAG online, do NOT close circuit breakers P6, P7, P9, P12, or P15. These circuit
breakers engage power requirements beyond SAG’s capacity. When these circuits are
necessary, start one of the SSG’s, transfer load to SSG (paragraph 2-14), and shutdown
SAG.
l.
Apply load by dosing (ON), as required, switchboard circuit breakers P5 thru P13 and P15 thru P18 (Figure 2-
13) one at a time.
m.
Close (ON) circuit breaker P8 (Figure 2-12) to provide power to power panel 2. Start void(s) 4 port and/or
starboard exhaust fans to provide ventilation in generator area Close (ON) circuit breaker 9P8 for void 4
starboard ventilation and circuit breaker 10P8 for void 4 port ventilation (Figure 2-4).
2-14.
Paralleling generators and transferring load
NOTE
These procedures can be done only while operating generators from switchboard.
a.
Start new generator by following procedures in paragraphs 2-11 and 2-13, steps a thru i.
b.
Using AUTOMATIC VOLTAGE CONTROL RHEOSTAT (Figure 2-11), adjust voltage on new generator to a
value slightly higher than online generator.
c.
Switch INCOMING GENERATOR switch (Figure 2-14) to indicate incoming generator. This action allows
SYNCHROSCOPE to indicate frequency of incoming generator.
d.
Using GOVERNOR SPEED CONTROL switch (Figure 2-11), adjust frequency of new generator rotation so
SYNCHROSCOPE (Figure 2-14) either stops at the 12 o’clock position or turns very slowly in clockwise
direction.
e.
If synchroscope pointer cannot be stopped at the 12 o’clock position, allow synchroscope to run slowly through
several complete rotations before performing step f below.
CAUTION
Before paralleling generators, notify crew members NOT to make any electrical
power changes such as turning any electrical motors on or off. Sudden power
surges while paralleling may cause a reverse power situation on one generator and
may damage that generator.
f.
Quickly and forcibly engage new generator circuit breaker (P1, P2, P3) (Figure 2-14) as synchroscope pointer is
stopped at 12 o’clock position or as it slowly passes through 11 o’clock position on synchroscope dial.
NOTE
If Incoming generator does not electrically match switchboard bus powered by online
generator, circuit breaker will forcibly bounce back to open. When this happens, return
to procedures In step 2-14b and try again.
2-26
