Edwards nXR30i User Manual

8. Fault nding
A lis
t of fault condions and their possible causes is provided to assist in basic
troubleshoong. If you are not able to recfy a fault, call your supplier or your nearest
Service Technology Centre for advice.
Fault The pump has failed to achieve the required performance
Cause The vacuum ngs ar
e dirty or damaged.
Remedy Make sure that the vacuum ngs are clean and scratch free.
Cause There is a blockage or high pressure in the exhaust line.
Remedy Make sure that the exhaust valves ed ar
e not closed when the pump is in
operaon.
Cause The motor controller is current liming the supply
.
Remedy If the alarm indicator LED (Figure: Interface control panel, (5)) ashes, it indicates
that the pump has high current load from possibly a high inlet pressure/ow.
Adjust the inlet pressure/ow unl the pump performance recovers.
Cause The pump performance is di
erent at the working applicaon load.
Remedy The pump does not have a a
t performance curve, peak pumping speed can vary
with inlet pressure and gas load. Check the actual performance against the
performance curve shown in Technical data on page 13.
Cause Blocked rotors
Remedy When the pump gets hot and if debris may have been ingested or condensed
within the pump, the r
otors may be stuck. Let the pump cool down to room
temperature, then restart, once operaonal run the pump with the gas ballast
applied for at least 2 hours to try and clear any internal blockages. If the problem
persists is recommended to contact supplier for further informaon and advice.
Cause The pressure measurement technique or gauge head is not suitable or gives an
inc
orrect indicaon of pressure.
Remedy Make sure that the vacuum measurement equipment is calibrated and is updated.
The correct gauge range must be selected for the applicaon. Contact us for further
assistance on gauge selecon, if required.
Fault The pump is noisy
Cause The pump is contaminated with solid parcles.
Remedy Contact us or the supplier for further informaon.
Fault The pumping speed is poor or pump down me is t
oo long
Cause The pipelines c
onnecons are too small in diameter.
Remedy Make sure that the pipework has sucient conductance (user's responsibility) and
the pump performance is not compromised.
05/2021 - ©Edwards Limited
Page 42A90301880_C
A90301880_C - Fault nding

Edwards nXR30i Specifications

General

Brand	Edwards
Model	nXR30i
Category	Water Pump
Language	English