Edwards ELD500 Series

D135-10-880C - Maintenance
Page 89
6. In doing so, the cover should be moved somewhat to the front by the downward
motion of the screwdrivers. The cover may be lifted up by the upwards motion of the
screw drivers so that the cover is disengaged completely.
7. Then pull the cover off the mechanical section up to its stop and remove it to the
front.
8. Removing the cover for the electronics section by removing the four Phillips screws
(Figure 40 item 2).
9. Pull the cover over the electronics section back to the rear and place it aside.
10.After completion of all maintenance work put the electronic cover back in place and
screw it tighten. The cover of the mechanical section must engage properly in the
openings at the bottom.
Exchanging the filter mats
The filter mats have been built in to filter the dust out the air which is taken in. In order to
ensure that the filter mats will not throttle the air flow and so that sufficient cooling is
possible at all times, the filter mats should be cleaned or exchanged as soon as these have
attained a dark grey colour.
Filter mats are used at two places within the ELD500:
1. at the ventilation slit of the electronic cover (only partly visible from the outside)
2. at the fan of the turbo molecular pump (only partly visible from the outside)
To exchange the filter mats remove the covers as described above.
Filter mat a.) these filter mats are screwed to the electronic cover. Unscrew the screws and
exchange the filter mats.
Filter mat b) This filter mat is fixed before the fan with a plastic bracket. Take of the bracket
and remove the filter, put on the bracket and fix it properly.
Under certain circumstances a dirty mat may be cleaned by shaking the dust out or by using
a vacuum cleaner so that the filter mat can be used again.
In the ventilation line is a dust filter installed. This filter has to be cleaned or changed when
using in dirty environment.
Exchanging the oil
Remove the cover of the mechanical section as described in Opening of the ELD500.
WARNING:
During all maintenance and connection work, make sure that the mains cable have been
reliable disconnected and do not carry a mains voltage.The leak detector must only be
used in with the hoods closed. The electrical connections must only be provided by a
trained electrician as specified, for example, by the regulations EN 50110-1.
WARNING:
When the pump has been pumping hazardous substances, determined the kind of hazard
first and ensure that suitable safety precautions are taken. Observe all safety regulations.