Edwards T-STATION 85

Turbo setpoint screen
The turbo se
tpoint screen is used to congure the start delay of the turbo pump.
When the turbo setpoint screen is selected, the TSP LED is lit and the current setpoint is
displayed. The default is "OFF". The turbo setpoint menu is not available if the turbo pump is
running or the selected units are volts.
1. To change the turbo setpoint press the ENTER key, then use the NEXT key to choose
between o, me delay and pressure setpoint.
2. Press the ENTER key again to conrm the selecon.
3. When me delay is selected the display will show the delay me in seconds. The
default me is 120 s. This means that the turbo pump will start aer a delay of 120 s
from when the START key is pressed. To change the value of the delay me press and
hold the ENTER key to start number entry mode.
4. If an acve gauge is connected to the system the pressure setpoint can be used to start
the turbo pump once the pressure has fallen below the setpoint value. When pressure
is selected the display shows the setpoint pressure. The default pressure is "5.0
0
" mbar
shown as an exponenal. To change the pressure setpoint, press and hold the ENTER
key to start number entry mode.
Note:
If the turbo se
tpoint is set to pressure but a gauge is not connected the turbo pump will not
start.
Figure 8
Turbo setpoint screen
Number entry mode
When the ENTER k
ey is pressed and held on either the me or pressure opon, number entry
mode is entered. The rst digit starts ashing and the me or pressure can be edited.
1. Press the NEXT key to adjust the value, then press the ENTER key to conrm the digit
and then move on to the second digit, which is adjusted similarly. The ENTER key
conrms the digit and then moves to the nal digit of the me setpoint or the
exponent of the pressure setpoint. The exponent of the pressure setpoint is adjusted
as a single value in the range - 10 to + 6.
2. The nal press of ENTER conrms the complete number and returns to showing the
setpoint value. The TSP is set aer the complete number is entered.
D395-94-880A - Operaon
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