Troubleshooting - Conair HPD Series User Manual

Tr o u b l e s h o o t i n g
WARNING: Disconnect power and air sources. Always disconnect the pump from
the loading control, main power source, and compressed air source before servic-
ing. This prevents the pump from starting during servicing, which could cause per-
sonal injury from flying debris or moving parts.
Problem
Motor does not start; no
motor noise.
Motor does not start;
humming noise.
Protective motor switch trips
when motor is switched on.
Power consumption too high.
Pump-motor unit does not
generate any or generates
insufficient vacuum.
Possible cause
At least two power supply leads
interrupted.
One power supply lead interrupted.
Winding short-circuit.
Motor overloaded.
Leak in the system.
Wrong direction of rotation.
Solution
Eliminate interruption by fuses,
terminals or power supply cables.
Eliminate interruption by fuses,
terminals or power supply cables.
Have winding checked.
Clean filters, mufflers and connection
pipes if necessary.
Eliminate interruption by fuses,
terminals or power supply cables.
Seal leak in the system.
Reverse direction of rotation by inter-
changing any two connecting leads.
Tr o u b l e s h o o t i n g l 5 - 3