TM 5-6115-400-12
Table 3-3. Troubleshooting-Continued
Malfunction
Probable cause
Corrective action
21.
Voltage output too high
a.
Improper voltage adjustment
a. Refer to paragraph 2-14 for
applicable operating details sad
adjust voltage to agree with poi-
tion of voltage reconnection panel
b. Remote voltage control cir-
b. Make sure the remote volt-
cuit is not complete when single-
age control circuit is complete.
unit remote operation is required
22.
Main generator noisy
a. Foreign object penetrating
a. Remove object from louvers
the generator ventilating louvers
or screens.
or screens.
Caution: Unusual noises from the generator generally indicate a part failure. Stop the generator set immediately (fig. 2-8) as continued
operation may result in additional damage to the generator. Report unusual noise to higher echelon.
23.
AC ammeter fails to register
a.
Ammeter defective.
a.
Replace ammeter (para
b. Ammeter-voltmeter selector
b.
Replace selector switch (pa
switch defective.
3-70).
24.
Generator frequency drops
a. Engine lacks power.
a.
Check timing cycle of engine.
under load
25.
Generator fails to parallel
a.
Unit parallel switch defec-
a. Replace unit parallel switch
tive.
b.
Paralleling receptacle defec-
b. Replace paralleling recep-
tive.
tacle.
26.
Voltage erratic
a.
Brush holders loose
a. Refer to higher echelon
b.
Brushes faulty.
b. Reseat or replace brushes
c. Reconnection panel terminals
c. Tighten reconnection panel
loose.
terminal
Warning: Be sure unit is shut down before performing work on reconnection panel.
27.
Generator sparks at collector
Brushes defective.
Replace brush
rings
Section VI. RADIO INTERFERENCE SUPPRESSION
the stray currents. The methods used include shielding
3-17. Definitions
the high-frequency wires, grounding the frame with
a. Interference. The term "interference" as used
bonding straps, and using capacitors and resistors.
herein, applies to electrical disturbances in the radio
3-19. Interference Suppression Components
set and which may interfere with the proper operation of
radio receivers or other electronic equipment.
a. Primary Suppression Components. The primary
suppression components are those whose primary
b. Interference
Suppression.
The
term
function is to suppress radio interference.
These
"interference suppression" used herein, applies to the
components are described and located in figure 3-10.
methods used to eliminate or effectively reduce radio
b. Secondary Suppression Components. These
interference generated by the generator set.
components have radio interference suppression
functions which are incidental and/ or secondary to their
3-18. General Methods Used To Attain
primary function.
Proper Suppression
Essentially, Suppression is attained by providing a low
resistance path to ground for
3-16