Elmo Rietschle G-BH7 Operating instructions - Manual (Page 24)

Servicing
610.44436.40.000 24 / 28 © Gardner Denver Deutschland GmbH
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*)
Flow speed too high. Clean pipes. Use pipe with larger cross-
section if necessary. Operator Abnormal flow
noises.
Muffler soiled. Clean muffler inserts, check condition and
replace if necessary. Service*)
Abnormal
running noise. Ball bearing lacking grease
or defective. Regrease or replace ball bearing. Service*)
Seals on muffler defective. Check muffler seals and replace if
necessary. Service*) Compressor
leaky.
Seals in motor area
defective. Check motor seals and replace if
necessary. Service
*) Only when the maintenance manual is at hand: rectification by the operator.