Edwards 30B5M, Инструкция по эксплуатации

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Operation
B064-04-880 Issue F
4 Operation
4.1 Introduction
In the following sections we assume that the 30B5M pump will be used in conjunction with a pumping system as shown
in
Figure 7 . Unless otherwise stated, item numbers in brackets in the following sections refer to the components of
the pumping system in Figure 7 .
The pumping system shown in Figure 7 has a holding pump (item 11). If your vacuum system is not large, and rough
pumping does not take a long time, you may not need a holding pump.
Always obey the following rules when you operate the pump:

Always turn on the cooling-water supply before you switch on the pump; if you do not, the pump may
overheat.

Always allow the pump boiler to cool to 100 ºC before you turn off the cooling-water supply.

Never allow the pressure at the inlet of the pump to rise above 1300 mbar (1.3 x 10
5
Pa) when the pump is at
operating temperature.

When the pump is at operating temperature, never allow the backing pressure to rise above the critical
backing pressure for the fluid used.

Always allow the pump to cool before the pump-inlet and backing pressures are allowed to rise above their
critical values.
4.2 Check the insulation resistance of the heaters
If the pump heaters have absorbed moisture while the pump was switched off, the insulation resistance of the heaters
may be too low. Use the following procedure to measure the insulation resistance of the heaters before you switch
the pump on.
If you have an RCCB in your electrical supply circuit, you do not need to measure the insulation resistance of the
heaters, because the RCCB will operate to disconnect the electrical supply from the the pump if the insulation
resistance is too low.
If your RCCB has operated, use the following procedure to check the insulation resistance of the heaters before you
reset the RCCB.
WARNING
Do not touch any part of the 30B5M pump when it is switched on. Avoid contact between the pump
and combustible materials, plastic materials and electrical cables. Surfaces of the pump are very
hot and can cause injury to people and damage to equipment.
WARNING
If the cooling-water supply fails during operation, steam or water may be ejected from the
couplings if they are disconnected.
WARNING
The pump must be run with the side panels fitted. The panels are an essential part of the safe
thermal management of the pump. Removal of the panels could cause the thermal trips to function
incorrectly and the pump boiler to overheat and implode.