BOC E2M28, Instruction Manual

Page: 33 / 52

E2M28 and E2M30 Rotary Vacuum Pumps
OP
ERATION
PAGE
27
Issue K 27 Jul 05
4.8 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 Section 7.4.15).
We recommend, as described in the procedure below, that you decontaminate the oil before you shut
down the pump; this will prevent damage to the pump by the contaminates in the oil.
1. Refer to Section 4.6 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.