Gorman-Rupp Pumps SE2D3A 115V 1P 1483930 and up User Manual
Page 20
OM-06495
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