Edwards DRYSTAR GV Series, Инструкция по эксплуатации

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A705-74-880 Issue K
Page 46 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
MAINTENANCE
The pump operates at too
high a temperature or the
pump temperature is
unstable. Is the cooling-water flow inadequate or is
the flow being interrupted? Before you restart the pump, check for
correct cooling-water flow (see above).
The pump operates with
poor performance in
pumping speed and/or
ultimate vacuum. Is the interstage relief valve stuck in the
open position? Inspect the interstage relief valve and
overhaul it or replace it if necessary
(refer to
Section 5.12 ).
The pump-motor trips out
due to excessive electrical
current consumption when
the pump is operating with
inlet pressure in the range
300 to 1000 mbar Is the interstage relief valve stuck in the
closed position? (GV410 and GV600 only) Inspect the valve and if necessary replace
it (refer to
Section 5.12 ).
The gearbox and oil are
contaminated with the
process substances
pumped. Has the shaft-seal purge failed? Check the pressure of the air or nitrogen
purge flow to the shaft-seals; if necessary
adjust the air or nitrogen pressure.
Change the gearbox oil before you restart
the pump (refer to
Section 5.8 ).
Have the seals in the pump failed? The seals must be replaced. Contact your
supplier or Edwards for advice.
The gearbox is noisy. Is the oil level low? Check the oil level and fill as necessary
(refer to
Section 5.3 ).
The pump does not
operate. Is the pump-motor faulty? Make all the other appropriate checks in
this table. If there is no other apparent
cause for failure of the pump to operate,
check the pump-motor and if necessary
replace it (refer to
Section 5.13 ).
Table 8 - Troubleshooting guide
Symptom Check Action