Edwards nXDS Series - Replace the Tip-Seals; Replace the Pump Bearings (Service Indicator); Replace the Pump Controller (Service Indicator); Electrical Safety Check

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Maintenance
A735-01-880 Issue C
5.6 Replace the tip-seals
This information is applicable to the nXDS replacement tip seal kit that must be fitted. Refer to Section 7.3.1 for
ordering information.
A tip-seal replacement should be carried out to maintain or restore the pumps performance. The frequency for
replacing the pump tip-seals is determine by the following factors:
 The pump has reached a service interval. Refer to Sections 5.5 and 5.7.
 The pump is no longer achieving the required performance.
If the pump is no longer achieving the required performance prior to a service interval being reached, Edwards
recommends first following the guide lines, refer to Section 5.11.2.
Note: There may be a running-in period after fitting your new tip-seals. The performance should improve over a
period of 24 to 48 hours. If the pump performance does not improve sufficiently after the running-in period,
please contact Edwards for advice.
For information on how to replace the nXDS tip-seals and Health and Safety, refer to the nXDS replacement tip seal
kit instruction manual A735-02-840 which is included on the CD manual. Also refer to Youtube video at
https://www.youtube.com/watch?v=vKnh9dxOyhE.
5.7 Replace the pump bearings (service indicator)
The service indicator, (flashing ON 3s / OFF 1s) is triggered to indicate that a bearing replacement service interval
has been reached. Bearing wear cannot necessarily be detected under normal operating conditions. This service
interval is a recommendation that a bearing replacement is required, this is especially useful if operating a
preventative maintenance plan.
It is possible for an experienced technician, who is suitably trained, to perform maintenance and repair on nXDS
pumps up to and including bearing replacement. Edwards has developed a detailed maintenance manual and
instructional video (Edwards part number A73501713) that will enable an experienced technician to undertake this
work. If required Edwards can also provide face to face training. Please contact Edwards for more information or to
purchase this training.
Note: Failure to replace the pump bearings at this time may subsequently lead to damage of the pumping
mechanism.
Note: A tip-seal change and exhaust and ballast valve change should be carried out at the same time when
performing a bearing replacement. Refer to Section 7.3 for ordering information.
To reset the service indicator, refer to Section 5.10.
5.8 Replace the pump controller (service indicator)
The service indicator, (flashing ON 3s / OFF 3s) is triggered to indicate that the pump controller should be replaced.
Contact Edwards for further details.
To reset the service indicator, refer to Section 5.10.
5.9 Electrical safety check
Test the earth continuity and the insulation resistance of the pump system in accordance with local regulations for
the periodic testing of electrical equipment.
The earth continuity should be less than 0.1Ω and the DC insulation resistance greater than 1.0 MΩ.
If the pump fails any of these tests, the supplier or Edwards must be contacted.