
P.48
PM10U
EBARA
CORPORATION
8. Maintenance and Inspection
8.1 Internal energies
Following items show internal energies that shall be considered before start
service maintenance.
8.1.1 Power source
This dry pump is supplied with AC200V power source. Aside from the pump,
the accessory power source locating in the vicinity of the power connectors are
supplied with voltage even when the pump is completely stopped. To conduct
pump maintenance or service, be sure to turn off the breaker switch, lock it out
and then unplug the power cable. Refer to Section 3.4 in this manual for locking
out the breaker switch.
8.1.2 Cooling water
This dry pump is supplied with cooling water at pressure of maximum 0.4 MPa.
Disconnection of the cooling water resulted from improper handling may cause
electrification and unit damage. For service and transportation, unplug the
cooling water connection plugs on the inlet and outlet, and seal off with plastic
cap. The self-sealing plug is used for the cooling water connection plug in these
pumps.
8.1.3 N2 gas
This dry pump is supplied with N2 gas at pressure of maximum 0.7 MPa for
diluting and sealing inside the pump. For service and transportation, close the
supply-source valve to reduce the pressure with the regulator and detach the gas
connection. Close N2 port with blank off plug. If the pump has already operated
with process gases, purge the residual gases with N2 gas after stopping the
pump operation. Then, conduct maintenance.