© Edwards Limited 2008. All rights reserved. Page 23
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Operation
B753-03-880 Issue F
4 Operation
4.1 Start-up
Use the procedure below to start up a basic, manually-controlled pumping system with a manual vent-valve and an
end user version EXC Controller (for example, EXC120 or EXC300). Refer to the EXC instruction manual where the
backing pump and accessories are automatically controlled by the EXC Controller.
1. Turn the manual vent-valve clockwise to close it.
2. Turn on the cooling-water supply (if water-cooling is used).
3. Start the backing-pump.
4. When the vacuum system pressure is approximately 10 mbar (1 x 10
3
Pa) or less, press the Start/Stop button on
the EXC Controller to start the EXT pump.
5. The pump will then accelerate to full operating speed. The pump rotational speed is shown by the LED speed
indicator on the front panel of the EXC Controller.
Note: The first time you pump down the system to vacuum, you must re-tighten the bolts which secure the inlet-
flange: refer to Section 3.3.4.
4.2 Stand-by
You can press the Standby button on the EXC Controller to operate the EXT pump at reduced rotational speed. Select
Standby before or after Start-up, for any of the following reasons:
z To extend pump-bearing life and still maintain adequate vacuum pumping performance (for example, when
you leave a system under vacuum over holiday periods).
z To increase system pressure or to extend the maximum inlet pressure range of the pump where this suits a
particular process.
Do not disconnect the pump-to-controller cable when the EXT pump is operating. If you do, there
may be a risk of injury or death by electric shock.
Do not operate the pump unless it is connected to your vacuum system. If you do, the pump rotor
can cause injury. The pump rotor rotates at very high speeds and you may not be able to see that
the pump is rotating.
Do not expose any part of your body to vacuum. If you do, you may be injured.
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