© Edwards Limited 2013. All rights reserved.
Page 13
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OPERATION
B756-50-880 Issue C
4
OPERATION
4.1
Start-up procedure
Use the procedure below to start up a basic manually controlled pumping system with a manual vent valve and an
EXDC160 Controller.
1. Ensure that the manual vent valve is closed (turn clockwise to close it).
2. Switch on the power to the air cooler.
3. Start the backing pump.
4. When the vacuum system pressure is approximately 10 mbar or less, switch on the power supply to start the
EXT70/70/200H pump.
5. The pump will accelerate to full operating speed. Once nominal operating speed is reached, the normal speed
LED on the EXDC160 Controller will illuminate.
4.2
Shut-down procedure
Note:
In an emergency only, open the vent valve quickly to decelerate the pump rotor in the shortest possible
time.
Use the procedure below to shut down a basic manually controlled pumping system with a manual vent valve and an
EXDC160 Controller.
1. Close the valve in the backing line connecting the EXT70/70/200H pump to the backing pump.
2. Switch off the backing pump.
3. Switch off the power supply to the EXT70/70/200H pump.
4. When the EXT70/70/200H pump rotational speed has fallen to below 50% speed, slowly turn the manual vent
valve anti-clockwise to open it. Ensure that the rate of pressure rise does not exceed the allowed rate of
pressure rise, otherwise the pump can be damaged. Refer to
4.3
Safety interlocks and control system
The pump protection and safety interlock features are described in
. Refer to the instruction manual
supplied with the controller for a full description of these features.
WARNING
Do not operate the EXT70/70/200H pump unless it is firmly mounted in the correct system
chamber and the chamber is bolted to the LCT premier system. The pump rotates at very high
speeds and the rotating blades may not be apparent. If the pump is not installed correctly, the
pump rotor can cause injury.
WARNING
Refer to the customer system instructions for correct start-up and shut-down procedures for the
LCT Premier system.
