Gorman-Rupp Pumps SE1 1/2A3A 115V 1P 1483930 and up - Manual (Page 20)

OM−06489 SE SERIES
TROUBLESHOOTING PAGE D − 3
Test Equipment
A volt/amp/ohmmeter and megohmeter of ade-
quate range and quality will be required to conduct
the following electrical tests. The suggested equip-
ment indicated below is commercially available, or
an equivalent substitute may be used.
Equipment Use
Ammeter To check AC Voltage
and current (amperage)
Ohmeter To measure resistance
(ohms) to ground
Motor And Motor Power Cable Continuity
To check continuity, zero-balance the ohmmeter
set at the RX1 scale, and test as follows:
a Disconnect the power cable plug from its re-
ceptacle.
b. Connect the test leads to the two power
cable leads (not to the green ground lead). If
there is a high resistance reading on the
ohmmeter, there is an open or broken circuit
caused by a break in the power cable or mo-
tor windings, or by a bad connection be-
tween the motor and the power cable.
c. If an open or broken circuit is indicated,
check the power cable for obvious damage,
and replace as necessary (see MAINTE-
NANCE AND REPAIR). The entire motor
power cable must be replaced; splicing or
other means of repair are not recom-
mended.
d. If the power cable appears undamaged, see
Head and Power Cable Removal, sepa-
rate the pump head from the motor housing,
and disconnect the power cable leads from
the auto control device leads. Separately
test each of the cable leads, (including the
green ground lead) for continuity. If any of
the power cable leads do not check out for
continuity, replace the entire power cable.
e. If no break is found in the power cable, con-
nect the test leads to the stator leads. If the
test reading indicates an open or broken cir-
cuit, there is an open circuit in the motor.
NOTE
It is recommended that a pump with a defective mo-
tor be returned to Gorman-Rupp, or to one of the
Gorman-Rupp authorized Submersible Repair
Centers.
f. Be certain to reconnect all leads as indi-
cated in the Wiring Diagram, Figure D-1 and
seal the connections with the male and fe-
male connector sleeves before reassem-
bling the pump head to the motor housing.
If insulation resistance is to be checked, do not as-
semble the pump head to the motor housing at this
time.
Insulation Resistance
To check insulation, zero-balance the ohmmeter
set at the RX100K scale, and test as follows:
a. Disconnect the power cable plug from its re-
ceptacle.
b. Connect one test lead to the power cable
plug grounding prong and touch the other
test lead to each of the two power prongs in
turn.
c. The reading obtained will indicate resis-
tance values in both the power cable and the
motor windings. If the resistance reading is
infinity (
1), the insulation is in good condi-
tion. If the reading is between infinity (
1)
and 1 megohm, the insulation is acceptable
but should be rechecked periodically. If the
reading is less than 1 megohm, the insula-
tion should be checked more closely. A
reading of zero indicates that the power
cable or the motor is grounded.
d. To determine whether the power cable or
the motor is grounded, separate the pump
head from the motor housing (see Head
and power Cable Removal/Installation in
MAINTENANCE AND REPAIR section) and
disconnect the power cable leads. Test the