TM 55-1730-229-12
TO 35C2-3-473-1
(3) Current transformer T1 provides
WARNING
voltages to the GCU proportional to
Battery power (24 vdc) may be
the current in each phase of the
present
at
terminals
of
generator output. Each of the current
electrical components whenever
transformers T2-T4 provides a voltage
battery is connected. AC power
output proportional to current in one
(115 vac) may be present when
phase of the generator ac output. One
engine is running. To prevent
of the transformers, depending on the
shock hazard, flash burns, or
position of the AC PHASE SELECT
prevent damage, observe the
switch 1S9, is connected to the AC
following precautions:
%LOAD meter M9 when the ac contactor
is activated. Also, one phase of the
1. Shut down engine and
frequency transducer is connected,
disconnect battery before open-
the frequency transducer drived AC
ing control panel or extending
HERZ meter 1M10.
lower electrical tray.
(4) The GCU monitor the generator
2. Shut down engine and
ac output continuously for the
disconnect
battery
before
following possible faults:
under
contacting
any
electrical
voltage, over voltage, over current,
terminal with body or tools.
or under frequency.
3. Temporarily install con-
(5) The under voltage limit is set
trol panel before starting
at 108 vrms and the over voltage
engine.
limit is set at 118 vrms. The under
frequency is set at 375 Hz. The over
WARNING
current is set by control panel
CURRENT LIMIT SELECTOR 1S11 at 10KW,
Remove all rings, watches and
20 KW, 30KW, or 45 KW. On the 83-360D
other jewelry when performing
the current limit settings are:
maintenance on this equipment.
17KVA, 38 KVA, 59 KVA (AH-64A.H-60),
and 90 KVA (AH-64D). When a fault is
detected, the GCU system logic
NOTE
deactivates the ac contactor or
removes generator field excitation to
Some maintenance procedures
protect the generator and output
require that the control panel
circuits.
The
GCU
logic
also
be lowered, or that the lower
illuminates the appropriate control
electrical tray be extended.
panel fault lamp (OVER VOATAGE 1DS14,
Refer to paragraph 4-24 for
UNDER VOLTAGE 1DS15, OVER CURRENT
these procedures.
1DS16, or UNDER FREQUENCY 1DS17).
(6) The possible generator ac
faults are summarized in Table 4-13
along with the protective action and
WARNING
fault lamp indications. After a fault
occurs, the GCU system logic is
Remove all rings, watches and
latched until the control panel AC
other jewelry when performing
POWER
switch
1DS10
is
set
maintenance on this equipment.
(momentarily) to RESET, or MASTER
switch is set to OFF.
GENERATION AND CONTROL SYSTEM FOR
MAINTENANCE.
