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Series 642
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
If you need any further information, please contact one of our service centers. You will find the
addresses on our website: www.vatvalve.com.
605593EC
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?
- 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?
Edition 2017-11-24
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 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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