nash_elmo Industries GmbH
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Order No.: 610.44436.40.000
Subject to change
Edition 09/2003
Servicing
9 Servicing
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
Have you read the safety precautions in
Chapter 1, "Safety", Pg. 3 f.?
Otherwise you many not carry out any work
with or on the pump-motor unit!
WARNING
Improper use of the unit can result in
serious or even fatal injuries!
All maintenance work on the pump-motor unit
must always be performed by the Service
Department!
Maintenance work on the pump-motor unit may
only be conducted by the operator itself when
the related
maintenance manual
on hand!
Inquire with the Service Department!
9.1 Repairs/troubleshooting
Fault
Cause
Remedy
Carried out
by
Motor does
not start;
no motor
noise.
At least two power supply
leads interrupted.
Eliminate interruption by fuses, terminals or
power supply cables.
Electrician
One power supply lead
interrupted.
Eliminate interruption by fuses, terminals or
power supply cables.
Electrician
Open vacuum pump/compressor cover,
remove foreign body, clean.
Service*)
Impeller is jammed.
Check or correct impeller gap setting if
necessary.
Service
Impeller defective.
Replace impeller.
Service*)
Motor does
not start;
humming
noise.
Rolling bearing on drive
motor side or vacuum
pump/compressor side
defective.
Replace motor bearing or vacuum
pump/compressor bearing.
Service*)
Winding short-circuit.
Have winding checked.
Electrician
Reduce throttling.
Service*)
Motor overloaded. Throttling
does not match
specification on rating plate. Clean filters, mufflers and connection pipes
if necessary.
Service*)
Protective
motor switch
trips when
motor is
switched on.
Power
consumption
too high.
Compressor is jammed.
See fault: "Motor does not start; humming
noise" with cause: "Impeller is jammed.".
Service*)
Leak in system.
Seal leak in the system.
Operator
Wrong direction of rotation.
Reverse direction of rotation by
interchanging two connecting leads.
Electrician
Incorrect frequency (on
pump-motor units with
frequency converter).
Correct frequency.
Electrician
Shaft seal defective.
Replace shaft seal.
Service*)
Different density of pumped
gas.
Take conversion of pressure values into
account. Inquire with Service Department.
Service
Pump-motor
unit does not
generate any
or generates
insufficient
pressure
difference.
Change in blade profile due
to soiling.
Clean impeller, check for wear and replace
if necessary.
Service*)
