6-1. DC CONTROL SYSTEM.
TM5-6115-585-34
NAVFAC P-8-623-34
TO-35C2-3-455-2
TM-05684C/05685B-34
CHAPTER 6
MAINTENANCE OF CONTROL SYSTEM
Section I. DESCRIPTION AND FUNCTION
R e f e r t o t h e O p e r a t o r a n d O r g a n i z a t i o n al
Maintsnance Manual for the description and function
of the dc control system.
6-2. AC INSTRUMENTATION SYSTEM.
R e f e r t o t h e O p e r a t o r a n d O r g a n i z a t i o n a l
Maintenance Manual for description and function of
the ac instrumentation system.
Section II.
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.
6-3. VOLTAGE REGULATOR.
Excitation current is controlled through the static
type automatic voltage regulator. The voltage regu-
lator continuously compares the output voltage of the
synchronous generator with a stable reference volt-
age. The difference between the two voltages con-
stitutes an error signal which indicates an output
voltage that is higher or lower than the generator
set point. This error signal is amplified and used to
control the direct current output of the voltage regu-
lator which is applied to the control windings of the
current-voltage transformers.
MAINTENANCE
(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 accurate 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
transducer 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.
Change 4
6-1
