A533-23-880 Issue C
Page 100 © Edwards Limited 2009. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
maintenance
26.Refit the lower side panels to the iF system as described in Section 3.16.
27.Refit the upper and lower front covers to the iF system by tightening the quarter turn fasteners.
6.12 Zero the gas module flow transducer
Note: The flow transducer is zeroed by the software in the control system; you do not need to physically adjust
any part of the iF system.
The accuracy of the mass flow transducer in the Gas Module may drift slightly and we recommend that it is 'zeroed'
(that is, calibrated for zero gas flow) once a year.
You must zero the transducer with the electrical supply on, the iF system switched off and your nitrogen supply off
and disconnected from the iF system. This ensures that the transducer is correctly zeroed when there is no nitrogen
flow (if you zero the transducer with the nitrogen supply connected, small nitrogen leaks through the solenoid-valves
could affect the calibration).
Use the Setup/Service/Zero Sensors menu to start to zero the transducer, then use the Status menu to display the
gas flows; the gas flow displayed will be zero when the transducer has been correctly zeroed. Note that it will take
approximately 15 minutes to zero the transducer; if required, you can use the Status/Zero time menu to view the
time remaining before the transducer is zeroed.
6.13 Adjust the Pump Display Terminal display viewing angle
If the display (Figure 7, item 2) is difficult to see, use the following procedure to adjust the display viewing angle.
1. Refer to Figure 17. Remove the Pump Display Terminal (8) from the recess (5) in the dashboard.
2. Place or hold the Pump Display Terminal in its normal operating orientation.
3. Turn the display adjuster (9) clockwise or anticlockwise until the display is easy to read.
4. Refit the Pump Display Terminal (8) in the recess (5) in the dashboard.
5. If necessary, repeat Steps 1 to 4 until the display is easy to see.
6.14 Replace a fuse
Note: You can only change the fuses in fuse holders F7, F8 and F9. A Edwards service engineer must change fuses
F1 to F6 in the Electrics Box (refer to Figure 4).
You can only change the low voltage fuses F7 to F9 for the d.c. electrical supply, the iF Interface Module and the
emergency stop circuit. If any of the internal fuses F1 to F6 have failed, you must contact your supplier or Edwards
for advice. Only change a fuse if you have identified and rectified the cause of the failure.
Care must be taken when working on gas module pipe fittings. Nitrogen trapped under pressure in
the purge system presents a potential hazard when unscrewing pipe fittings.
Ensure that you replace a fuse with a new fuse of the correct rating. If you do not, the iF system
will not be adequately protected and you can damage the iF system or cause injury to people. Do
not remove the cover from the electrics box. High voltages exist in the electrics box when it is
connected to the electrical supply. There are no spare parts that can be serviced in the electrics
box.
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