TM 5-6115-584-34
NAVFAC P-8-622-34
TO-35C2-3-456-2
TM-05682C-34
CHAPTER 6
MAINTENANCE OF CONTROL SYSTEM
Section I.
6-1. DC CONTROL SYSTEM.
DESCRIPTION AND FUNCTION
6-3. VOLTAGE REGULATOR.
Refer to the Operator and Organizational Maintenance
Excitation current is controlled through the static type
Manual for the description and function of the dc control
automatic voltage regulator. The voltage regulator contin-
system.
uously compares the output voltage of the synchronous
generator with a stable reference voltage. The difference
between the two voltages constitutes an error signal which
6-2. AC INSTRUMENTATION SYSTEM.
indicates an output voltage that is higher or lower than
the generator set point. This error signal is amplified and
Refer to the Operator and Organizational Maintenance
used to control the direct current output of the voltage
Manual for description and function of the ac instrumen-
regulator which is applied to the control windings of the
tation system.
current-voltage transformers.
Section II. MAINTENANCE
6-4. CONTROL CUBICLE.
a. Wiring Harness.
(1) Remove. Disconnect wires of wiring harness
from all components. Remove clamp attaching harness
to control panel and remove harness.
(2) Repair. Table 6-1 lists the wire number, gauge,
color, length and terminal lugs for each wire in the harness.
Repair consists of replacing wires as required.
(3) Installation. Install harness by connecting wires
to components per figure 6-1. Attach harness to control
panel with clamp.
b. Meters (on equipment test).
(1) Frequency Meter (M3) (16, figure 6-3). Con-
nect a frequency meter of known accuracy to single phase
output terminals of load terminal board. Make certain
reconnection switch is in proper position for single phase
output. Operate Generator Set and check readings of panel
meter (M3) against test frequency meter. If panel meter
does not give the same reading as the test meter, test
transducer as given in (2) below.
(2) Frequency Transducer (A3) (56, figure 6-3).
Test transducer using the same procedure as for testing
frequency meter. If transducer does not give proper meter
reading, replace the transducer and/or the meter.
(3) Percent Current Meter (M4) (17, figure 6-3).
Connect an ac test ammeter in series with the % rated
current meter. Operate Generator Set with a single phase
load. Continue adding load to set until meter reads 0.75
amps. Meter (M4) should read 100% ± 2% . Replace meter
if necessary.
(4) AC Voltmeter (M5) (18, figure 6-3). Attach
test ac voltmeter in parallel (across terminals) with panel
ac voltmeter (M5). Operate Generator Set and compare
readings of the two meters. Panel voltmeter must be ac-
curate to ± 2.5%, except between 115 and 125 volts,
accuracy must be ± 3 volts and between 200 and 250 volts,
accuracy must be ± 5 volts. If panel meter does not meet
these requirements, replace meter.
c. Meters (remove).
(1) Frequency Meter (M3) (16, figure 6-3). Tag
and disconnect two leads from meter. Remove three
screws, lockwashers, and nuts attaching meter to panel
and remove meter.
(2) Frequency Transducer (A3) (56, figure 6-3).
Tag and disconnect four leads to frequency transducer.
Remove four screws (54) and nuts (55) attaching trans-
ducer to back of control cubicle and remove transducer.
(3) Percent Current Meter (M4) (17, figure 6-3).
Tag and disconnect two leads from meter. Remove three
screws, lockwashers, and nuts attaching meter to control
panel and remove meter.
6-1
