Edwards nEXT 55, Instruction Manual

Page: 75 / 116

Figure 27 Auxiliary interface connection
1. Accessory connector 1. Accessory connector
6.2.4 Alternative valve connected to the vacuum system
When you use another vent valve, install a vent restrictor to the vacuum system to limit
the rate of increase in pressure.
Refer to
Table: Vent restrictor orifice diameter if venting the vacuum system chamber for
information about vent restrictor sizes. If a vent restrictor is not installed, open the vent
valve only after the speed of the pump decreases to 50% of full rotational speed.
Vacuum system volume (litres) Orifice diameter (mm)
< 20 < 1.0
< 10 < 0.7
< 5 < 0.5
< 2 < 0.35
6.3 Operation with parallel control and monitoring
6.3.1 Start the pump
WARNING: EXPOSED ROTOR
Risk of injury. Do not operate the pump with its rotor exposed. Connect the pump to
the vacuum system before you operate the pump. If the pump is operated with its
rotor exposed, the pump rotor can cause injury as it rotates at high speeds and the
rotating blades are not visible.
07/2021 - ©Edwards Limited Page 75 B8G000880_E
B8G000880_E - Operation