TM 9-6115-604-34
NAVFAC P-8-633-34
c.
Test. See Figure 5-33.
(1)
Pick up voltage test.
(a)
With switch open, apply 120 V ac power to terminals 5 and 6 at rear of K115.
(b)
Adjust potentiometer for voltmeter indication of zero V ac.
(c)
Close switch.
(d)
While observing voltmeter, adjust potentiometer to increase voltage until relay trips.
(e)
Verify relay trips at 20 i4 V ac.
(2)
Time voltage test.
(a)
With switch open, apply 120 V ac power as in step (1), above.
(b)
Adjust potentiometer for voltmeter indication of 24 V ac.
(c)
Set time totalizing timer to zero seconds.
(d)
Close switch S2.
(e)
Verify relay trips at 1 ±0.5 seconds by referring to timer.
d.
Repair. See Figure 5-32. Repair ground fault relay K115 by replacement of defective components.
e.
Install. See Figure 5-9.
(1)
Remove cover from ground fault relay K111 (67). If installed, by removing screw and captive washer
assemblies (68).
(2)
Install ground fault relay K115 (67) in cabinet A door and secure with screws (66).
(3)
Install cover on ground fault relay Kl15 (67) by installing screw and captive washer assemblies (68).
(4)
Connect wiring as tagged and discard tags.
5-38. SYNCHRO CHECK RELAY K116 (69, Figure 59).
a.
Inspect. See Figure 5-9.
(1)
Inspect synchro check relay K116 (69) for damage.
(2)
Check wire connections for security.
b.
Remove. See Figure 5-9.
(1)
Tag and disconnect wires from synchro check relay KI16 (69).
(2)
Remove synchro check relay Kl16 (69) by removing screw and captive washer assemblies (62).
c.
Test.
(1)
Connect synchro check relay K116 to 120 V ac, 50/60 Hz power source and multimeter set to RX1 scale as
shown in Figure 5-34. Apply 120 V ac, 50 Hz, A phase, to terminals 1 and 2 of relay K 116.
(2)
Apply 120 V ac, B phase, to terminals 3 and 4.
(3)
The multimeter should indicate infinite ohms (contacts open). Voltages are not synchronized.
(4)
Repeat steps (1) and (2), above, with 120 V ac. 60 Hz, C phase, applied to terminals 3 and 4.
(5)
The multimeter should indicate infinite ohms (contacts open). Voltages are not synchronized.
(6)
Connect synchro check relay K116 to 120 V ac 50/60 Hz power source and multimeter set to RX1 scale as
shown in Figure 5-34.
(7)
Apply parallel 120 V ac, A phase, to terminals 1 and 2, and terminals 3 and 4 of relay K 116.
(8)
The multimeter should indicate zero ohms (contact closure).
5-80
