Edwards nEXT 55, Instruction Manual

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The manufacturer's flange heater may be used to heat the pump (refer to Accessories on
page 105). Fit the appropriate band around the pump CF inlet flange. When baking the
pump or the system, make sure that the temperature of the inlet flange does not exceed
the values given in Table: General technical data .
When baking the vacuum system, if the temperature of the system exceeds 200 °C, put a
radiation shield between the system and the pump. This radiation shield will reduce the
heat radiated onto the pump rotor.
Typically, a bakeout of four hours is sufficiently long to remove water condensation from
the pump. However, the bakeout time will depend on the amount of condensation in
the pump and the vacuum system, and the ultimate pressure desired.
6.10 Shut down the pump manually
Note:
In an emergency only, open the vent valve quickly to decelerate the pump rotor in the
shortest possible time.
Use this procedure to shut down a basic, manually-controlled pumping system with a
manual vent valve.
1. Set the pump to off, but keep the backing-pump on and backing valve open.
2. When speed has fallen to 50%, open the vent valve.
3. When the pump reaches standstill, the vent valve and backing valve may be closed
and backing pump set to off.
07/2021 - ©Edwards Limited Page 85 B8G000880_E
B8G000880_E - Operation