If the pump (and the vacuum system) are heated, the degassing process will speed up
and the pump can r
each the ulmate vacuum in the shortest possible me. Heang the
pump will also prevent condensaon of vapours in the pump.
The manufacturer's BX bakeout band can be used to heat the pump. Refer to Accessories
on page 99. Install correct band around the pump, just below the CF inlet ange. When
baking the pump or the system, make sure that the temperature of the inlet ange is not
more than the values given in Table: General data.
When baking the vacuum system, if the temperature of the system is more than 200 °C,
put a radiaon shield between the system and the pump. The radiaon shield decreases
the heat radiated onto the pump rotor.
A bakeout of four hours is long enough to remove water condensaon from the pump.
The bakeout me depends on the amount of condensaon in the pump and the vacuum
system, and the ulmate pressure necessary.
Table 23
Behaviour of a pump when the power is re-instated aer an electrical supply failure
Length of power failure Control mode Behaviour of pump
Power is restored before the ro-
taonal speed of the pump de-
creases below 50%
Parallel or serial control mode
Regenerave power keeps all
output signals acve during the
power failure. The pump will
speed up to designated speed af-
ter the power has been restored.
04/2022 - ©Edwards Limited
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