TM 9-4120-411-14
(2) Tag and disconnect leads from contactor line terminals 1L1, 3L2, 5L3, and 13NO. Using a multimeter set to
measure continuity, check continuity between each set of contactor contacts 1L1 to 2T1, 3L2 to 4T2, 5L3 to
6T3, and 13NO to 14NO. No continuity should be indicated. Connect wire leads per tags. Remove tags.
WARNING
Lethal voltage levels are used in operating the FDECU. Be sure power has been
disconnected prior to servicing the unit. Injury or death can occur if personnel
contact any electrical terminal while the unit is connected to power source.
c. Overload Relays. See figure 4-11. Be sure power has been disconnected prior to testing the overload relays.
(1)
K6. (FDECU-2 & -3 ONLY) Tag and disconnect leads from overload switch terminals 95 and 96 (1).
Push reset button (2). Using a multimeter set to measure continuity, check continuity between overload
switch terminals. Continuity should be indicated. Raise TRIP lever (3) to trip overload manually then check
continuity between overload switch terminals. No continuity should be indicated. Push reset button.
Connect wire leads per tags. Remove tags.
(2) K7 and K8. Tag and disconnect leads from overload switch terminals 97NO and 98NO (4) and from
terminals 95NC and 96NC (5). Push RESET button (6). Using a multimeter set to measure continuity,
check continuity between terminals (4). No continuity should be indicated. Check continuity between
terminals (5). Continuity should be indicated. Push test button (7) to trip overload manually then check
continuity between terminals (4). Continuity should be indicated. Check continuity between terminals (5).
No continuity should be indicated. Push reset button. Connect wire leads per tags. Remove tags.
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