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A750-04-880 Issue F
3.15
Check the direction of pump rotation
Ensure that the pump rotates in the correct direction. If it does not, the pump and your vacuum
system can become pressurised when you operate the pump.
If you remove a guard during the following procedure, ensure that you do not come into contact
with the shaft, the coupling/belt or the drive system when you operate the pump. If you do, you
may be injured by the rotating components.
Do not continue to operate the pump without sealing liquid in the pump. If you do, there may be
a risk of damage to the pump.
Check the direction of rotation of the pump as follows:
1. Edwards preferred method would be to visibly check the fan on the motor for direction of rotation. If this is not
possible, temporarily remove any guard over the drive coupling or belt.
2. Observe the pump drive shaft while you start up the pump (refer to
(refer to
Section
4.4) after a few seconds.
3. Check that the pump drive shaft rotated correctly in the direction shown by the arrow on the pump.
4. If the direction of rotation was incorrect:
If you have fitted a drive and transmission system: check the drive and transmission system and reconfigure
in accordance with the manufacturer's instructions.
Perform the direction of rotation check from Step 2 again, to ensure that the pump now rotates in the
correct direction.
5. If you have removed the guard over the drive coupling or belt (as in Step 1 above), refit the guard.
3.16
Check the leak tightness of the system
Ensure that the system is leak tight. If you do not, there will be a risk of explosion during operation.
3.16.1
General requirements
Check the leak tightness of the system and seal any leaks found after you have installed the pump, to prevent leakage
of substances out of the system and leakage of air into the system:
For ATEX Category 1, 2 or 3 pumps, the system must be leak tight to limit any air leakage into the system to a level
which obviates the risk of fire or explosion.
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WARNING
WARNING
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WARNING
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4.2), then shut down the pump
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