Edwards nEXT85 User Manual

to below 50% of maximum speed, it is safe to hard vent (open the vent valve fully) provided
the backing pump is le on and the backing valve is open.
To use the nEXT85 controller funcon, the nEXT85 turbo pump controller has a 4-pin auxiliary
connector socket on the side of the pump, as circled in Figure 8 on page 47, to which the
vent valve with the auxiliary connector ed is plugged into.
The controller is capable of controlling a number of dierent venng opons. These are
dened in Table 6 on page 46.
The controller is capable of accommodang both normally open and normally closed vent
valve types. These are dened in Table 7 on page 47. A power cycle is required aer making a
change to the valve type, before the auxiliary output circuitry adjusts to accommodate the
requested change.
Table 6
Vent valve opons
Opon number Descripon of vent funcon
0 Vent valve opens fully below 50% full rotaonal speed for either a stop
command or fail condion.
*
1 Controlled venng from 100% to 50% full rotaonal speed and then vent
valve opens fully below 50% for either a stop command or fail condion.
2 If a stop command is received, vent valve fully opens immediately. In a
fail condion, vent valve opens fully below 50% full rotaonal speed.
3 If a stop command is received, vent valve fully opens immediately. In a
fail condion, controlled venng from 100% to 50% full rotaonal speed
and then vent valve opens fully below 50%.
4 In a fail condion, vent valve fully opens immediately. If a stop command
is received, vent valve opens fully below 50% full rotaonal speed.
5 In a fail condion, vent valve fully opens immediately. If a stop command
is received, controlled venng from 100% to 50% full rotaonal speed
and then vent valve opens fully below 50%.
6 Vent valve fully opens immediately for either a stop command or a fail
condion.
7 Same as opon 6
8 Auxiliary output is permanently energised (Fan).
§
9 Do not use
10 Auxiliary output is permanently de-energised (Fan).
11 Do not use
12 Do not use
13 Do not use
14 Vent valve opens fully below 50% full rotaonal speed for a stop
command.
15 Controlled venng from 100% to 50% full rotaonal speed and then vent
valve opens fully below 50% for a stop command.
*
This is the factory default seng for Vent Opon 1.
§
This is the factory default seng for Vent Opon 2 to enable cooling fan behaviour.
B8G0-00-880A -
Operaon of the nEXT85
Page 46

Edwards nEXT85 Specifications

General

Brand	Edwards
Model	nEXT85
Category	Water Pump
Language	English