Edwards nEXT730D Instruction Manual page 78

Option num-
ber
5
6
7
8
9
10
11
12
13
14
15
*
This is the factory default setting for Vent Option 1.
§
This is the factory default setting for Vent Option 2 to enable cooling fan behaviour.
Table 20 Valve types
Option number
0
1
*
This is the factory default setting for Valve 1 type and Valve 2 type.
When the pump is shipped, the controller is configured with the factory default Vent
option 1 set to 0 and the Valve 1 type set to 0, as detailed in
and Table: Valve
options provided commands can be sent via the serial interface, an Edwards TIC Turbo
and Instrument Controller, TIC Turbo Controller, or the Edwards nST2 PC software 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 starting the nEXT 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 options 14 or 15 are used, the
controller will ensure that the TAV solenoid valve will only 'open' upon receipt of a stop
command. Therefore there is no need to send the delayed start command.
B8J200880_D
300812671_002_C3
B8J200880_D - Operation
Description of vent function
In a fail condition, vent valve fully opens immediately. If a stop com-
mand is received, controlled venting from 100% to 50% full rotational
speed and then vent valve opens fully below 50%.
Vent valve fully opens immediately for either a stop command or a fail
condition.
Same as option 6
Auxiliary output is permanently energised (Fan).
Do not use
Auxiliary output is permanently de-energised (Fan).
Do not use
Do not use
Do not use
Vent valve opens fully below 50% full rotational speed for a stop com-
mand.
Controlled venting from 100% to 50% full rotational speed and then
vent valve opens fully below 50% for a stop command.
Description of valve type
Normally open vent valve
Normally closed vent valve
types. The controller can be configured to one of the other venting
Page 78
§
*
Table: Vent valve options
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