level of maintenance.
Before referring to table 5-5, be sure that all
applicable checks have been performed.
OPERATOR/CREW MAINTENANCE OF THE
AUTOMATIC CONTROL MODULE. This paragraph
provides instructions to assist the operator/crew in
maintaining the automatic control module. If defective
components are noted during inspection, refer to next
higher level of maintenance for replacement or repair.
(See figure 2-19).
AVAILABLE lamp for loose mounting or loose
connections. Inspect relays for loose mounting
or loose connections.
b. Replacement. Replace defective bulb in lamp
Table 5-6 provides information for locating and
correcting operating troubles which may develop in the
generator set when used with the automatic control
module. Each malfunction is followed by a list of tests
or inspections which will help to determine probable
causes and corrective actions to take. Perform the tests
or inspections and corrective actions in the order listed.
Any trouble beyond the scope of organizational
maintenance shall be referred to the next higher level of
ORGANIZATIONAL MAINTENANCE OF THE
AUTOMATIC CONTROL MODULE. (See figure 2-19).
a. Inspection. Inspect the under/ over voltage
device, underfrequency device, overfrequency
device, relays, timers, switches, and fuseholders
for loose mounting, loose wires, cracking, or
damage. If components are damaged or
defective, and their replacement is beyond the
scope of organizational maintenance, refer to
the next higher level of maintenance.
RETURN/INSTANT RETURN Mode Selector
(1) Test the mode selector switch S1 by tagging
and removing wires, then removing switch
(2) Refer to FO-12 sheet and connect one lead
of ohmmeter (set on low scale) to the arm
terminals 11 and 21) of the mode selector
switch. Connect the other ohmmeter lead to
the terminal set for that position. Meter
should indicate continuity for the set of
leads, no continuity for all others. Repeat
this step for the other terminals (rotate
switch to corresponding position). If switch
indicates an open or intermittent contact on
any of the closed switch positions, or a
closed circuit on an open position, replace
(3) Install switch with mounting hardware and
connect wires. Remove wire tags.
c. Testing Toggle switch.
(1) Test the toggle switch by tagging and
The FREQ SELECT 50 HZ/60 HZ switch S2
must be removed from the panel for testing.
(2) Using an ohmmeter (Rx1 scale), close
switch and check for continuity.