Table of Contents
Advertisement
The following electrical checks can be made with pump installed.
Risk of high voltage electrical shock
when testing. Can stun, burn, or kill.
Circuit (Winding) Resistance Test
1. Shut off main power supply and disconnect motor wires.
2. Attach two ohmmeter leads to pairs of cable wires in
turn (black and red wires on three wire single phase
units). Compare readings with data provided in motor
manual.
3. If reading is considerably higher than chart in motor
manual, an open circuit (broken wire) is indicated; if
reading is considerably lower, a short circuit is
indicated. In either case, remove pump from well and
repair unit.
NOTICE: Be sure to include cable and winding resistance.
Multiply cable length by the per-foot cable resistance (see
Table IV, Page 2) and add winding resistance from motor
chart to get total.
Incoming
Power
Ohmmeter
Set at Rx1 or
Voltmeter
Set on LO
Ohms
Figure 6A: Circuit (Winding) Resistance Test
ELECTRICAL TEST
( Figure 6A)
Controller
G
L3
L2
L1
Ground
To Pump
125 0893
Only qualified electricians should perform these
tests.When testing, use all normal precautions for the
voltages involved.
Ground Check
(Figure 6B)
1. Shut off main power supply and disconnect motor wires.
2. Attach one ohmmeter lead to pipe or METAL well
casing and the other lead, in turn, to each individual
motor wire.
3. If resistance reading goes to zero after touching any of
the wires, the pump should be raised to determine
location of ground fault (cable, motor, or splice).
4. Raise pump, watching resistance reading. When resis-
tance goes to infinity, fault has come out of the water. If
ground fault is located in cable or splice, repair it.
5. If ground fault appears to be located in motor, remove
pump from well. Cut cable at motor side of splice and
determine whether or not motor is grounded. If motor
indicates complete ground (resistance reading goes to
zero) replace unit.
If motor is not grounded, re-check splice and cable.
Ohmmeter
Set at Rx100K
or Voltmeter
Set on H1
Ohms
Figure 6B: Ground Check
6
Controller
G
L3
Incoming
L2
Power
L1
To Pump
Ground
127 0893
Advertisement
Table of Contents
