Edwards T-STATION 85

2. To change the vent valve seng press the ENTER key, then use the NEXT key to choose
be
tween 50%, Ctrld and FAN.
3. Press the ENTER key again to conrm the selecon.
Table 6
Vent valve screen
50
no
Normally open vent valves. Vent valve opens fully when the speed of the turbo pump
dr
ops below 50% full rotaonal speed.
Ctl
no
Normally open vent valves. Controlled venng from 100% to 50% full rotaonal
speed; vent valve opens fully below 50%.
Fan Normally open vent valves. The vent valve connecon on the turbo pump is
permanently powered so that the vent valve will remain closed. This can also be used
to provide power to an air cooler (for example, ACX75).
O Normally closed vent valves. The vent valve connecon on the turbo pump is
permanently disabled so the vent valve will remain closed.
50
nc
Normally closed vent valves. The vent valve will open when the speed of the turbo
pump has dropped below 50% during stop but not fail condions.
Ctl
nc
Normally closed vent valves. Controlled venng from 100% to 50% full rotaonal
speed, vent valve opens fully below 50% during stop but not fail condions.
Figure 7
Vent valve screen
Vent valve screen key acons
Table 7
Vent valve screen key acons
Keys Short press Long press
START Go to turbo screen -
ENTER Enter edit mode, or conrm
selecon
-
NEXT Next vent opon, or go to TSP
c
ontrol screen
Scroll through vent opons in edit
mode or scroll through menu
screens
D395-94-880A - Operaon
Page 21