V4.0
1-1/2 HP Open Drip Proof Electric Motor
8703068
Visit www.princessauto.com for more information
11
Problem(s) Possible Cause(s) Suggested Solution(s)
Fuse/circuit
breaker
overloads.
1. There is a
blown fuse or
open circuit
breaker.
2. Motor starter
overload
activated.
3. Low or no
voltage
reaching motor.
4. Power enters
control circuit
but does not
reach the
motor.
5. Motor shaft
does not turn
when power
applied.
1. Test for voltage at the fuse or circuit breaker.
Also see if the voltage/amp rating of the fuse
or circuit breaker is correct for the motor. It
should exceed the Motor’s FLC by 25 percent.
2. Let cool and then reset overloads. Test the
starter before starting motor again.
3. Check each motor terminal’s voltage. The
voltage should be within 10% of the voltage
on the motor’s nameplate. Disconnect the
load and apply power to the motor. If the
motor operates normally, then the issue is
with the load attached to the motor. Should
the motor still not work, have it serviced or
replaced by a qualified technician.
4. Begin by confirming all contacts are clean
and tight. Examine for obvious damage.
a. Test each part of the circuit for power until
the problem area is discovered.
b. Have a qualified service technician repair
or replace the circuit.
5. Disconnect the motor from the load and test
under no-load conditions. If the shaft does
not turn, the bearing are immobilized. Have
the motor serviced or replaced by a qualified
technician.
Excessive
vibration or
noise.
1. Excessive end
play in motor.
2. Worn or poorly
lubricated
bearings.
1. An unbalanced motor or load creates vibration.
Check for excessive end play or loose parts.
a. Realign the motor and load. Check end play
by trying to move the motor shaft in and
out. Add end-play washers as required.
b. If the shaft is bent, replace the rotor or
motor.
2. Damaged or poorly lubricated bearing can be
heard. This may be a result of wear,
inadequate oil reaching the bearings or the
motor overheating. Contact Princess Auto
Ltd. for a solution.
