Edwards T-Station 75

© Edwards Limited 2011. All rights reserved. Page 27
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
D395-93-880 Issue A
5.3 Inspect the hoses, pipelines and connections
1. Inspect all of the electrical connections and check that they are secure. Tighten any loose connections.
2. Inspect all of the electrical cables and check that they are not damaged and have not overheated. Replace or
repair any damaged or overheated cable.
3. Inspect all of the vacuum and exhaust connections and check that they are secure. Tighten any loose
connections.
4. Inspect all of the vacuum and exhaust pipelines and check that they are not corroded or damaged and that they
do not leak. Replace or repair any corroded or damaged component and seal any leaks found.
5.4 Fault-finding
For additional information about fault-finding of the pumps used on your T-Station, refer to Section 1.2.2
Table 9 - Fault finding
Symptom Check Action
The T-station has
failed to start
Has the electrical supply fuse blown?
Is the operating voltage correct?
If so, replace the fuse. Refer to Section 2.3
for the correct fuse rating.
Check your voltage supply matches the
T-Station voltage requirements. Refer to the
electrical rating label located at the rear of
the T-Station.
Ultimate pressure
cannot be reached
Is the pressure limited by water vapour?
Are any of the vacuum gauges contaminated?
Is the pumping speed insufficient (due to
poor conductance between the pump and the
gauge or too large a chamber)?
Is the backing pressure too high?
>10 mbar (1x10
3
Pa) To check, use a vacuum
gauge directly on the turbo pump inlet (no
volume) and run the backing pump only.
Is the high vacuum area of the
system contaminated?
Check the rest of your system for leaks and
contamination.
Remove the pump from the system and test
the ultimate pressure of the pump alone.
Bake the chamber or run the system for a
duration until the vacuum improves.
If so, clean or replace them.
Increase the conductance or reduce the
volume.
If so, check the backing pipeline for leaks.
The backing pump may need servicing.
If so, clean the high vacuum system.
If found, repair the leaks and clean the
contamination.
If inlet pressure is poor, check the pump for
contamination and refer to Section 5 of the
turbo pump manual. Leak-test the pump. If
the leak rate >1x10
-7
mbar l s-1
(1x10
-5
Pa l s-1) contact your supplier or
Edwards.