A735-01-880 Issue C
Page 26 © Edwards Limited 2017. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Operation
4.5 Auto-run
The auto-run setting configures the pump to start at power-up without any customer intervention. This parameter is
customer configurable via serial communications, or using the START / STOP buttons. Holding down either the START
or STOP button, for more than eight seconds, will enable or disable the auto-run setting. The status of the auto-run
setting is visible via the auto-run LED.
The pump can be stopped using either manual, parallel or serial control modes whilst in auto-run.
4.6 Use of gas ballast control
The gas ballast control can be used to optimise the performance of the scroll pump for the application. The
performance characteristics of the pump with gas ballast on are shown in Section 2.2.3. The position of the gas
ballast control can be changed when the pump is either off or operating.
4.6.1 Gas ballast control
Use the gas ballast control to introduce air into the final stage of the pump. Use of gas ballast will reduce the
condensation of vapours in the pump; the condensates would contaminate the pump.
There are only two positions, 0 and 1. The gas ballast control knob will rotate 360° in either direction at 90° intervals.
4.7 Start up procedure
Use the procedure below to start up the pump:
1. Ensure that any vacuum system isolation valve is closed (if fitted).
2. With the mains supply to the pump isolated, connect a recommended lead to the electrical socket on the pump
(refer to Figure 1).
3. Apply power.
4. Start the pump system using the appropriate control source, that is, using the Start button in manual control
mode (refer to Figure 9); the Start/Stop control input (refer to Table 11, pin 3) in parallel control mode or a
Start command in serial control mode.
5. Open the vacuum system isolation valve, if fitted.
Gas ballast OFF (position 0). Use this setting to:
achieve ultimate vacuum
pump dry gases.
Gas ballast ON (position 1). Use this setting to:
pump low concentrations of condensable vapours
decontaminate the pump.
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