Installation, Operating & Maintenance Instructions
Series 650 DN 100-250 (I.D. 4“ - 10”), RS485
VAT Vakuumventile AG, CH-9469 Haag, Switzerland
Tel ++41 81 771 61 61 Fax ++41 81 771 48 30 Email
www.vatvalve.com
271149EA
2007-06-12
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3.6.3 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 ‘Close‘.
•
Only for versions that have Power Fail Option equipped [650 . . - . . U . - . . . .; 650 . . - . . W . - . . . .].
Note: This definition must be set on Master and Slave valves.
•
ZERO function (Master only). This may be ‘disabled’ or ‘enabled’. Default is ‘enabled‘.
Refer also to «ZERO».
•
Sensor configuration for 2 sensor version [650 . . - . . . K - . . . .] (Master only).
Refer also to «Pressure control operation with 2 sensors».
Local operation
:
(‘Control View’, ‘Control Performance Analyzer’ or
‘Service Box 2‘)
Remote operation
:
(Refer to chapter «setup commands» for details)
1. Do power up configuration in menu
‘Setup / Valve’.
2. Do power fail configuration in menu
‘Setup / Valve’.
1. Send VALVE CONFIGURATION
3. Enable or disable ZERO function in menu
‘Setup / Sensor’.
4. Do sensor configuration in menu
‘Setup / Sensor’.
2. Send SENSOR CONFIGURATION
3.6.4 ZERO
This function is available on the Master valve only.
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 +/- 1.4 V 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 «control commands» resp. «setup
commands» 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 and sensor configuration» of the setup procedure.
Otherwise incorrect pressure reading is the result.