Edwards nEXT85 User Manual

Table 7
Valve types
Opon number Descripon of valve type
0 Normally open vent valve
*
1 Normally closed vent valve
*
This is the factory default seng for Valve 1 type and Valve 2 type.
When the pump is shipped, the controller is
congured with the factory default Vent opon 1
set to 0 and the Valve 1 type set to 0, as detailed in Table 6 on page 46 and Table 7 on page 47.
The controller can be congured to one of the other venng opons provided commands can
be sent via the serial interface or an Edwards TIC Turbo and Instrument Controller or TIC Turbo
Controller or the Edwards nST PC soware can be used via the USB serial port.
If the valve type is set to normally open, the controller only energises or shuts the TAV solenoid
valve when it receives a start command. Prior to that, the valve will be in the ‘open’ vent state.
If the vacuum system is a large system, allow the backing pump to reduce the pressure in the
system to an acceptable level before starng the nEXT85 pump. In this case, send a command
via the serial interface to close the vent valve before sending a start command – this is known
as a delayed start.
If the valve type is set to normally closed, and either vent opons 14 or 15 are used, the
controller will ensure that the TAV solenoid valve will only ever ‘open’ upon receipt of a stop
command. Therefore there is no need to send the delayed start command.
If the nEXT85 pump is being controlled with an Edwards TIC Turbo and Instrument Controller or
TIC Turbo Controller, the TAV solenoid valve can be driven from the TIC. Refer to the TIC
Instrucon Manuals for more informaon.
Figure 8
Auxiliary interface connecon
1. Accessory Connector
B8G0-00-880A - Operaon of the nEXT85
Page 47

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English