A735-01-880 Issue C
Page 32 © Edwards Limited 2017. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Maintenance
5.10 Service indicator codes
The nXDS controller incorporates a service indicator (refer to Figure 7). The service indicator will flash a specific
code whenever a service interval has been reached. There are three service levels listed in Table 14.
To reset the service indicator, press and hold the standby speed increase and decrease buttons simultaneously for
more than 5 seconds.
Note: Resetting the pump bearing service indicator will also reset the performance check timer, that is, both
counters will be set to zero.
Note: Resetting the service indicator will reset the service timer back to zero (refer to Table 13).
5.11 Fault finding
5.11.1 The pump has failed to start or has stopped
The electrical supply fuse has blown.
The ambient temperature is too high.
The cooling air supply is insufficient or is too hot.
The process gas is too hot or the throughput is too high.
The fan is not working or is not connected.
The motor is faulty.
5.11.2 The pump has failed to achieve the required performance
Gas ballast may be selected. To close gas ballast, turn the control a quarter turn so that the valve snaps
shut. Use this setting to achieve the best possible vacuum. If the pump has been used to pump condensable
vapours or is to pump a large chamber that has been exposed to atmospheric air (water vapour), it may be
necessary to run for at least an hour on gas ballast.
If the electrical supply voltage is more than 10% below the lowest voltage specified on the user interface
panel, the pump may operate but deliver a degraded vacuum performance.
There is a leak in the system.
Tip seals may need further run-in, typically 24 hours, with some requiring up to a maximum of 100 hours.
The pressure measurement technique or gauge head is unsuitable or gives an incorrect indication of
pressure.
The vacuum fittings are dirty or damaged; replace the fittings.
The inlet strainer is blocked; clean or replace the strainer.
The connecting pipelines are too long or too small in diameter; conductance.
There is high pressure or a blockage in the exhaust line.
The pump contains traces of process vapours; run 12 hours with gas ballast.
Table 14 - Flashing service codes
Service flash code Comments See section
ON 1s / OFF 1s Pump performance check. 5.5
ON 3s / OFF 1s Pump bearing service. 5.6
ON 3s / OFF 3s Pump-Controller service. 5.7
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