Installation, Operating & Maintenance Instructions
Series 651 DN 320-400 (I.D. 12“ - 16”), Logic
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel +41 81 771 61 61 Fax +41 81 771 48 30 CH@vatvalve.com www.vatvalve.com
267736ED
2008-02-26
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3.6.2 Valve and sensor configuration
Basic valve configuration must be adapted according to application needs.
• Definition of valve plate position (CLOSE or OPEN) after power up sequence. Default is ‘close‘.
• Definition of valve plate position (CLOSE or OPEN) in case of a power failure. Default is ‘not defined‘.
Only for versions that have Power Fail Option equipped [651 . . - . . C . - . . . . or 651 . . - . . H . - . . . . ].
• ZERO function. This may be ‘disabled’ or ‘enabled’. Default is ‘enabled‘. Refer also to «ZERO».
• Sensor configuration for 2 sensor version [651 . . - . . . E - . . . .].
Refer also to «Pressure control operation with 2 sensors».
Local operation:
(‘Control View’, ‘Control Performance Analyzer’ or
‘Service Box 2‘)
Remote operation:
1. Do power up configuration in menu
‘Setup / Valve’.
2. Do power fail configuration in menu
‘Setup / Valve’.
Note: It’s not possible to do ‘Valve and sensor
configuration‘ via remote operation.
3. Enable or disable ZERO function in menu
‘Setup / Sensor’.
4. Do 2 sensor configuration in menu
‘Setup / Sensor’.
3.6.3 ZERO
ZERO allows for the compensation of the sensor offset voltage.
When ZERO is performed the current value at the sensor input is equated to pressure zero. In case of a 2 sensor system
both sensor inputs will be adjusted. A max. offset voltage of +/-1.4V can be compensated
. The offset value can be read
via local and remote operation.
Local operation:
(‘Control View’, ‘Control Performance Analyzer’ or
‘Service Box 2‘)
Remote operation:
(Refer to chapter «Digital inputs» for details)
1. Send OPEN VALVE
2. Wait until process chamber is evacuated and
sensor signal is not shifting anymore.
Go to menu ‘Zero / ZERO’ and follow instructions.
3. Send ZERO
Note: Do not perform ZERO as long as pressure gauge voltage is shifting otherwise incorrect pressure reading is the
result. Refer to manual of sensor manufacturer for warm up time.
Note: Do not perform ZERO, if the base pressure of your vacuum system is higher than 1‰ of sensor full scale. We
recommend disabling ZERO function in this case; refer to «Valve configuration» of the setup procedure. Otherwise
incorrect pressure reading is the result.
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