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Operation
D395-93-880 Issue A
4.3.3 Vent valve screen
If you have a TAV solenoid vent valve connected to the turbo pump podule the operation of the valve is controlled
by the vent valve screen. When the Vent Valve screen is selected, the Vent LED is lit and the current vent valve
control setting is displayed. The default is "50%". The Vent Valve menu is not available if the Turbo is running.
To change the vent valve setting press the ENTER key, then use the NEXT key to choose between 50%, Ctrld and FAN.
Press the ENTER key again to confirm the selection.
4.3.3.1 Vent valve screen key actions
4.3.4 Turbo set-point screen
The Turbo Set-Point screen is used to configure the start delay of the turbo pump. When the Turbo Set-point screen
is selected, the TSP LED is lit and the current set-point is displayed. The default is "OFF". The Turbo Set-point menu
is not available if the Turbo is running or the selected units are Volts.
To change the turbo set-point press the ENTER key, then use the NEXT key to choose between off, time delay and
pressure set-point. Press the ENTER key again to confirm the selection.
When time delay is selected the display will show the delay time in seconds. The default time is 120 s. This means
that the turbo pump will start after a delay of 120 s from when the START key is pressed. To change the value of
the delay time press and hold the ENTER key to start number entry mode.
If you have an Active Gauge connected to your system you can use the pressure set-point to start the turbo pump
once the pressure has fallen below the set-point value. When pressure is selected the display shows the set-point
pressure. The default Pressure is "5.0
0
" mbar shown as an exponential. To change the pressure set-point, press and
hold the ENTER key to start number entry mode.
50% The vent valve will open when the speed of the turbo pump has dropped to 50%
Ctrld Controlled venting from 100% to 50% full rotational speed; vent valve opens fully below 50%
Fan The socket on the turbo pump podule is permanently powered so the vent valve will remain closed.
This can also be used to provide power to an air cooler (e.g. ACX75) for remote mounting the turbo
pump.
Keys Short Press Long Press
START Go to Turbo Screen -
ENTER Enter edit mode, or confirm selection -
NEXT Next vent option, or
go to TSP Control Screen
Scroll through vent options in edit mode
or Scroll through menu screens
Change
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