Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
Edwards, nEXT Turbomolecular Pumps, nEXT240, nEXT300 and ...
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B800-00-880 Issue B<br />
5.5.1 Flashing Service Codes<br />
Whenever a service is required the st<strong>and</strong>ard once per revolution flash on the yellow status LED is replaced with a<br />
Service Flash Code. The Service Flash Codes are specified in Table 26.<br />
Table 26 - Flashing service codes<br />
Service Flash Code Comments Actions<br />
LED on 1sec<br />
LED off 1sec<br />
LED on 3sec<br />
LED off 1sec<br />
LED on 3sec<br />
LED off 3sec<br />
Oil cartridge service recommended<br />
Bearing <strong>and</strong> oil cartridge service<br />
recommended<br />
Pump service required<br />
It is recommended that the oil<br />
cartridge is replaced. Refer to<br />
Section 7.2.<br />
It is recommended that the bearing<br />
<strong>and</strong> oil cartridge are replaced. Refer<br />
to Section 7.2.<br />
The turbo impeller or controller has<br />
reached its expected life. It is<br />
recommended that the pump is<br />
returned to an <strong>Edwards</strong> service centre<br />
for service. Refer to Section 7.2.<br />
Maintenance<br />
5.5.2 Decoding service status words<br />
The service status may be accessed directly via the serial link. This method of accessing service status will give the<br />
most complete picture of current <strong>and</strong> future service requirements <strong>and</strong> will allow preventative maintenance activities<br />
to be scheduled.<br />
A summary of the current pending service status is provided in response to the service status comm<strong>and</strong>:<br />
You will receive the following reply:<br />
Comm<strong>and</strong> ? V 8 8 1 cr<br />
Reply = V 8 8 1 sp h h h h h h h h cr<br />
The Service Status Word is made up of 8 hexidecimal digits. To decode this word,you must convert each digit into a<br />
4-digit binary number as described in Section 5.5.9.<br />
Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode the<br />
Service Status Word, each bit is numbered (starting with 0 for the least significant to 31 for the most significant) as<br />
shown in Section 5.5.3. The meaning of each bit in the Service Status Word is given in Table 27.<br />
Table 27 - Service flags<br />
Bit Number Status flag Active flag means<br />
0 Oil cartridge service due Set when hours until oil cartridge service due = 0<br />
1 Bearing service due Set when hours until bearing service due = 0<br />
2 Pump service due Set when hours until pump service due = 0<br />
or cycles until pump service due = 0<br />
3 Controller service due Set when hours until controller service due = 0<br />
4 Reserved -<br />
5 Reserved -<br />
6 Reserved -<br />
© <strong>Edwards</strong> Limited 2009. All rights reserved. Page 65<br />
<strong>Edwards</strong> <strong>and</strong> the <strong>Edwards</strong> logo are trademarks of <strong>Edwards</strong> Limited.
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