Gorman-Rupp Pumps SE1 1/2A3 115V 1P 1483930 and up User Manual
Page 23
OM−06488
SE SERIES
TROUBLESHOOTING
PAGE D − 3
ELECTRICAL TESTING
If you suspect that pump malfunctions are caused
by defects in the motor, power cable or control box,
perform the following checks to help isolate the de-
fective part.
Obtain the services of a qualified elec-
trician to troubleshoot, test and/or ser-
vice the electrical components of this
pump.
Be certain to refer to the wiring diagram(s)
in the Installation Operations manual be-
fore reconnecting any electrical compo-
nents which have been disconnected.
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 the
receptacle, or lock out incoming power and
disconnect the power cable leads to the op-
tional manual switch or automatic control
box.
b. Connect the test leads to any two of three
power cable leads (not to the green ground
lead). If the is a high resistance reading on
the ohmmeter, there is an open or broken
circuit caused by a break in the power cable
or motor windings, or by a bad connection
between the motor and the power cable.
Switch one test lead to the third power lead,
and test again.
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 Disassembly, separate
the pump head from the motor housing, and
disconnect the power cable Amp-lock cap
from the Amp-lock plug. Separately test
each of the cable leads, (including the green
ground lead) for continuity through the
Amp-Lock cap. If any of the power cable
leads do not check out for continuity, re-
place the entire power cable.
e. If no break is found in the power cable, con-
nect the test leads to the power contacts
(not to the ground wire contact) of the Amp-
lock plug. If the test reading indicates an
open or broken circuit, there is an open cir-
cuit 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 the Amp-lock plug
and cap before reassembling 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.