VAT 650 Series Installation, Operating, & Maintenance Instructions page 74

Failure
Pressure reading is wrong
or
pressure reading is negative
ZERO does not work
Pressure is not '0' after ZERO
PRESSURE CONTROL does not
work
PRESSURE CONTROL not optimal
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
Installation, Operating & Maintenance Instructions
Series 650 DN 100-250 (I.D. 4" - 10"), CC-Link
Check
- Sensor(s) connected?
- 2 sensor version present at
valve controller?
- ZERO done?
- Does sensor power supply
provide enough power for
sensor(s)?
- Valve in open position, check
for O on display?
- ZERO disabled?
- Sensor voltage shifting?
- System pumped to base
pressure?
- Sensor offset voltage
exceeds ±1.4V
- Safety mode active, check for
D on display?
- PRESSURE CONTROL
selected, check for P on
display?
- LEARN done?
- Setup done completely?
- LEARN done?
- ZERO performed before
LEARN?
- LEARN interrupted?
- Was gas flow stable during
LEARN?
- Tuning done?
- Is sensor range suited for
application?
- Noise on sensor signal?
Action
- Refer to «Electrical connection».
- Check valve version on page 1. Verify configuration. Refer
to «Setup procedure».
- Refer to «Pressure control operation with 2 sensors».
- Perform ZERO when base pressure is reached. Refer to
«ZERO» for details.
- Verify sensor supply voltage.
- OPEN VALVE and bring chamber to base pressure before
performing ZERO.
- Enable ZERO.
Refer to «Valve and sensor configuration» for details.
- Wait until sensor does not shift any more before
performing ZERO.
- OPEN VALVE and bring chamber to base pressure before
performing ZERO.
- Replace pressure gauge.
- Provide power to motor to allow for operation.
- Refer to «Electrical connection» for details.
- Select PRESSURE CONTROL mode.
Refer to «Pressure control» for details.
- Perform LEARN.
Refer to «Setup procedure» for details.
- Perform «Setup procedure» completely.
- Perform LEARN.
Refer to «LEARN» for details.
- Perform ZERO then repeat LEARN.
Refer to «Setup procedure» for details.
- Repeat LEARN.
Refer to «LEARN» for details.
- Repeat LEARN with stable gas flow.
Refer to «LEARN» for details.
- Tune valve for application.
- Refer to «Tuning of control performance» for details.
- Use a sensor with suitable range (controlled pressure
should be >3% and < 98% of sensor full scale).
- Make sure a shielded sensor cable is used.
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2010-12-15