preset limits. To isolate the malfunction,
tag, then disconnect wiring at the overload
proceed as follows.
relay terminals. Remove the four screw
assemblies securing the relay in position.
6-176. BENCH TEST.
Exercise extreme care not to
touch exposed electrical connec-
a. Connect the overload relay to test
tions when working inside tactical
relay box with generator set
b. With the 120/208 VAC power source
deenergized, turn on the 24 vdc power
supply and close switch S1. Indicator DSl
should energize and indicator DS2 should
Remove cover from tactical relay
box to gain access to test points,
c. Energize the 120/208 VAC power
at rated speed and voltage, and with the
contactor closed, the voltage measured
amperes. Indicators DSl and DS2 should
across the plus (+) and minus (-) terminals
not change states.
of the overload relay K14 should read
20-32 VDC. The voltage from the NO ter-
minal (wire P200X16) to TB2-5 and from
the NC terminal (wire P62K16) to TB2-5
ammeter A 1 indicates 0.975 amperes.
should read 20-32 VDC.
After 8 2 minutes indicator DS1
should deenergize and indicator DS2 should
2. Apply 130 percent load to the
in 8 2 minutes. Determine that the unit
current meter indicates 130% of current on
e. Repeat step d for autotransformer
all phases. No current reading would indi-
T2 and T3. The test results should be the
cate an open current circuit. When the
same as the results for adjustment of auto-
relay actuates a momentary dc voltage
should be measured from the NO terminal
`(wire P209D16) to TB2-5 and there should
f. If the overload relay does not meet
be no dc voltage measured from the NC
the requirements of the above test, replace
terminal (wire P62K16) to TB2-5. If the
above conditions are not met, the K14 relay
the overload relay.
should be replaced.
6-177. INSTALLATION. Refer to figure
6-41 and install the overload relay in
position using four screw assemblies. Re-
The K14 relay should not actuate
with less than 110% load, if it does
the relay should be replaced.
Replace the tactical relay box and cover.