Edwards A34310940, Инструкция по эксплуатации

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When checking the pump, make sure that the pump is not going through a repetitive
cycle of thermal overload failures and automatic resets. If necessary, reduce the thermal
load from the pumped gases to prevent overheating of the pump.
5.8 Shut-down
Note:
If the gas-ballast control is open and the motor is switched off for any reason, the pump
drive shaft may rotate in the reverse direction, causing a system pressure rise. To prevent
this, use a gas-ballast control valve (refer to Gas ballast valve on page 48 ).
We recommend, as described in the procedure below, decontaminating the oil before
shutting down the pump; this will prevent damage to the pump by the contaminates in
the oil.
1. Refer to To decontaminate the oil on page 34 and decontaminate the oil, as
required.
2. Close the vacuum system isolation-valve (if not already closed).
3. Close gas-ballast (that is, turn the gas-ballast control clockwise).
4. Switch off the electrical supply to the pump.
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A34310880_T - Operation