TM 5-6115-275-14
NAVFAC P-8-615-14
TO 35C2-3-452-1
(2)
Operate the set at rated load on all
positions of the selector switch and check
output for proper voltage and phase.
Replace a defective switch.
Test (Model MEP-023A)
(1)
Refer
to
wiring
diagram
FO-3
for
connections diagram and check continuity
in all switch positions. Test between
various pins on receptacle J2 and output
terminals.
(2)
Operate the set at rated load on all
positions of the selector switch and check
output for proper voltage and phase.
Replace a defective switch.
CAUTION
shut down the unit when changing load connections.
d.
Testing of Ammeter Phase Switch (S2) (Model MEP-
023A). To test proceed as follows:
(1)
With generator set stopped, disconnect
lead from negative (-) side of Current
Indicator Meter (M5).
(2)
Attach one probe of a multimeter to
terminal number 11 of S2 and the other
probe to terminal number 12.
(3)
With switch knob in position I, continuity
should be indicated on the multimeter.
(4)
Move probe from terminal number 12 to
terminal 13, turn switch knob to 12. The
multimeter should read continuity.
(5)
Move probe from terminal 13 to terminal
14 and turn switch knob to I3, again the
meter should read continuity.
e.
Testing of Voltage Selector Switch (S3) (Model MEP-
023A). To test proceed as follows:
(1)
With generator set stopped, disconnect
lead from terminals 15, 25, and 26 of S3.
(2)
Attach one probe of a multimeter to post
number 2 of Voltmeter (M6). The
multimeter should read continuity between
post number 2 of M6 and the terminals
indicated below for the indicated positions
of S3.
VO-1, terminals 15, 16,and22.
VO-2, terminals 23, 26, and 27.
VO-3, terminals 17, 24, and 25.
(3)
Move probe of multimeter from post
number 2 of M6 to post number 1 and
place S3 in VO-1 position. Multimeter
should read continuity on terminals 12, 13,
and 14 of S3.
f.
Testing of Current Selector Switch (56) (Model MEP-
018A). To test proceed as follows:
(1)
With generator set stopped, disconnect
wire number D107A18 from current
selector switch (S6).
(2)
Attach one probe of a multimeter to
terminal number 11 of S6 and the other
probe to terminal number 12.
(3)
With switch knob in position 11, continuity
should be indicated.
(4)
Move probe from terminal 12 to terminal
13, turn switch knob to 12, continuity
should be indicated.
(5)
Move probe from terminal 13 to terminal
14 and turn switch knob to 13, again the
meter should read continuity.
g.
Installation. Refer to figure 7-1 or 7-3 and install the
switches
on
the
applicable
model
generator set.
7-6. Cabinet Cable Harness
a.
General. All wiring on the generator set is tagged with
code number. When testing, repairing, or
replacing electrical leads and wiring
harness, refer to the schematic diagram.
b.
Inspection. Inspect the insulation for cracks and fraying.
Pay particular attention to wires passing
through holes in panels and over rough
metal edges. If inspection reveals a
broken or cut wire is exposed, repair the
wire. If the break in the wire is in the
wiring harness, or in an inaccessible area,
replace the wire (d below).
c.
Testing. Test a wire for continuity by disconnecting each
end from the components to which it is
connected. Touch the test probes of a
multimeter to each end of the wire. If the
multimeter fails to show continuity, the
wire is defective and must be repaired or
replaced.
d.
Replacement. Replace a wire by disconnecting it from its
attachments and installing a new wire. If
a broken wire is part of a wiring harness,
disconnect the wire at each end and tape
the ends with electrical tape. Install a new
wire and attach it to the exterior of the
wiring harness.
7-7. Frequency Converter
a.
General. The frequency converter, located in the top
center of the control box, receives an ac
signal of 120 volts from one of the coil
groups of the generator and converts it to
dc voltage which is proportionate to the
frequency of the generator output. The
frequency meter is fed this dc voltage
which is used to
register hspz (hertz per second).
b.
On-Equipment Testing and Adjustment (Model MEP-
023A). With generator set operating at
3428 rpm, remove screw in the face of the
frequency converter and adjust the
potentiometer for a reading of 400 HZ on
the frequency meter. If proper reading is
not obtained, proceed as follows:
7-6 Change 8
