When checking the pump, make sure that the pump is not going through a repeve
cycle of thermal overload failures and automac resets. If necessary, reduce the thermal
load from the pumped gases to prevent overheang of the pump.
5.8 Shut-down
Note:
If the gas-ballast control is open and the motor is switched o for any reason, the pump
drive sha may rotate in the reverse direcon, 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, decontaminang the oil before
shung 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 isolaon-valve (if not already closed).
3.
Close gas-ballast (that is, turn the gas-ballast control clockwise).
4.
Switch o the electrical supply to the pump.
Page 35
A34310880_T - Operaon
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