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T R O U B L E S H O O T I N G G U I D E
PROBLEM
Motor runs, then stops
(continued)
POSSIBLE CAUSES
Motor starter heater size
too small
Specify gravity of liquid or
viscosity greater than
design
Water short in motor
electrical lead
Bad connection
Motor wired improperly
Three-phase current
imbalance
18
REMEDIES
Measure the current draw to
verify it is below the trip set-
ting. Increase the heater size
or adjust the trip setting to
correspond to the S.F.A. indi-
cated by the motor label.
QVS pumps are designed to
pump water. Consult the fac-
tory for liquids other than
water.
With the pump filled with the
process fluid, use a megohm
meter to measure the resist-
ance between each motor
lead and ground first at low
voltage, then at a potential
between 500 and 1000V if the
low-voltage test indicates an
open circuit. Consult the
motor installation and main-
tenance manual for accept-
able values.
With the circuit de-energized,
check for continuity using an
ohmmeter.
Confirm the circuit is wired for
single-phase or three-phase
power and the motor is
grounded.
Make sure the three legs of
your three-phase power are
balanced within ± 5% of each
other.
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