PMAC Air Compressor
Powerex
•
100 Mundy Memorial Drive
•
Mt. Juliet, TN 37122
•
USA
P 1.888.769.7979
•
F 513.367.3125
•
www.powerexinc.com
IN598601AV
•
01/2020
Page 5 of 12
Troubleshooting Guide
Problem
Corrective Action
Motor does not run, runs slowly or is excessively noisy
1.
Check wiring—make sure minimum voltage requirement is met and lead
wires are connected properly. Correct as needed.
2. Check to make sure motor is not overloaded. Remove coupling and
determine if noload operation of motor is correct. Check rotation of
pump by hand. It should turn smoothly. If not, check for pump damage or
obstruction in the pump.
Pump is noisy or rough, or puts too much load on the motor
1.
If amp draw and vibration are normal, allow the pump to run for a few
minutes and determine if noise diminishes and disappears. If not, contact
Powerex at 1-888-769-7979.
2.
Check to make sure isolation valves are open. Open ASME safety relief valve
at the after cooler. Stop unit and correct valve installation or setting.
3. Check to make sure that the pump is open to intake air. If isolation valves
are used on intake and are accidently closed when pump is running,
pump damage can occur. This is not covered under warranty. Powerex
recommends using a three way valve if isolation is desired so that no matter
the valve position, a path to intake air is always open.
Amp draw is high
1.
Check wiring—make sure voltage is within specified range and lead wires
are connected properly. Correct as needed.
2.
Check to make sure motor is not overloaded. Check rotation of pump by
hand. It should turn smoothly. If not, check for pump damage or obstruction
in the pump.
Excessive vibration
1.
Check for damage. If the motor shaft becomes bent due to shipping, the
mass of the pulley will be off center and generate vibrations. Replace the
motor.
2.
If the pump is damaged, the fan may rub and cause noise. It is possible to
replace just the fan. Contact Powerex at 1-888-769-7979 for instructions.
3. Some variation in vibrations profile is normal.
Pump rotates in reverse for more than a few seconds when
power is off.
1.
Check valve is leaking, allowing compressed air to vent through the pump.
If allowed to continue, pump damage may occur. Replace check valve.
2.
Do not use check valve other than Powerex original equipment.
