TM 5-6115-400-35
(a) 3 and 4 remove and reconnect to 6
and 7.
(b) 4 and 5 remove and reconnect to 7
and 8.
harness terminating in the jacks.
d. Test the wiring harnesses within the relay box.
Table 4. Specification for Over Voltage Relay
e. Test all capacitors using a suitable capacitor
tester.
Nominal Voltage
f. Test all resistors using an ohmmeter.
All
120V, 60-400 CPS
resistors whose measurements are beyond their rated
Pull-In Voltage
values and tolerances should be discarded.
157V
g. Test the diodes for shorts or opens using an
Time Delay
ohmmeter. When testing the diodes, connect the leads
Must sustain over voltage for minimum of 180
milliseconds and trip within one second.
from other diodes and surrounding circuitry.
Relay Contacts
Rating
76. Relay Box Removal
10 amperes resitine at 26.6 VDC
Contact Arrangement
Refer to figure 129 to remove the relay box.
2 PDT
Connections
77. Cleaning and Inspection
120V Line
Terminals 1 and 2
N. C. Contacts
a. Clean all parts with a clean cloth dampened with
3 and 4
an approved cleaning solvent and dry thoroughly.
N. 0. Contacts
b. Inspect resistors and diodes for damaged
4 and 6
terminals, defective insulation, and other visible
N. C. Contacts
damage.
6 and 7
c. Inspect the capacitors for broken leads or
N. 0. Contacts
cracked cases.
7 and 8
d. Inspect the chassis for cracks, breaks, and other
Contacts shown in normal position
damage. Inspect threaded parts for defective threads.
Contacts transfer at 166V (Fault)
e. Repair or replace defective parts as necessary.
Temperature Limits
-65to 85
C
78. Bench Testing
Temperature Trip Affects
+85 -+1 Volt
C
a. Refer to Table 4, specifications for (K2) over
voltage relay, and use the test procedure below to
b. Refer to Table 5) specifications for (K11) under
checkout the relay.
voltage relay, and use the test procedure below to
(1) Connect a light and suitable power supply
checkout the under voltage relay.
in series with terminals 3 and 4 and in like
(1) Connect a light and suitable power supply
manner with 4 and 5.
in series with contact 3 and 4 in like
(2) Connect a variable voltage supply (60-
manner also with contacts 4 and 5.
400 cps) to terminals 1 and 2.
(2) Connect a variable A.C. power source
(3) Set voltage to 120V.
(60 or 400 cps 0-120V) to terminals 1 and
2.
(4) Slowly increase voltage to 156V or until a
trip is indicated by the lights. Do not
(3) Adjust input voltage (1 and 2) to 120V.
increase beyond 165V.
(a) Light to 3 and 4 should go out.
(5) Check remaining relay contacts by 162
(b) Light to 4 and 5 should go on.
removing connections to lights and
(4) Reduce voltage slowly to 102V or until
reconnect as follows:
lights indicate relay drop-out.
162
