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 - Setup done completely?
If you need any further information, please contact one of our service centers. You will find the
addresses on our website: www.vatvalve.com.
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TROUBLE SHOOTING
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?
- 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?
Edition 2014-07-10
Action
- Refer to «Electrical connection».
- Check valve version on page 1. Verify configuration.
Refer to «Setup procedure».
- 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.
Series 651
605451EC