TROUBLE SHOOTING
Series 642
50/73
Edition 2013-08-22
603685EA
Failure
Check
Action
Pressure reading is wrong
or
pressure reading is negative
-
Sensor(s) connected?
-
Refer to «Electrical connection».
-
2 sensor version present at
valve controller?
-
Check valve version on page 1. Verify configuration.
Refer to «Setup procedure».
-
ZERO done?
-
Perform ZERO when base pressure is reached. Refer to
«ZERO» for details.
-
Does sensor power supply
provide enough power for
sensor(s)?
-
Verify sensor supply voltage.
CLOSE VALVE does not work
-
Safety mode active, check for
D on display?
-
Maintenance mode active
-
Provide power to motor to allow for operation.
-
Refer to «Electrical connection» for details.
-
Refer to “Display shows «
M C
»” in this table
OPEN VALVE does not work
-
Safety mode active, check for
D on display?
-
Maintenance mode active
-
Provide power to motor to allow for operation.
-
Refer to «Electrical connection» for details.
-
Refer to “Display shows «
M100
»” in this table
ZERO does not work
-
Valve in open position, check
for O on display?
-
OPEN VALVE and bring chamber to base pressure
before performing ZERO.
-
ZERO disabled?
-
Enable ZERO.
Refer to «Valve configuration» for details.
Pressure is
not ‘0’ after ZERO
-
Sensor voltage shifting?
-
Wait until sensor does not shift any more before
performing ZERO.
-
System pumped to base
pressure?
-
OPEN VALVE and bring chamber to base pressure
before performing ZERO.
-
Sensor offset voltage
exceeds ±1.4V
-
Replace pressure gauge.
PRESSURE CONTROL does not
work
-
Safety mode active, check for
D on display?
-
Provide power to motor to allow for operation.
-
Refer to «Electrical connection» for details.
-
PRESSURE CONTROL
selected, check for P on
display?
-
Select PRESSURE CONTROL mode.
Refer to «Pressure control» for details.
-
LEARN done?
-
Perform LEARN.
Refer to «Setup procedure» for details.
PRESSURE CONTROL not optimal
-
Setup done completely?
-
Perform «Setup procedure» completely.
-
LEARN done?
-
Perform LEARN.
Refer to «LEARN» for details.
-
ZERO performed before
LEARN?
-
Perform ZERO then repeat LEARN.
Refer to «Setup procedure» for details.
-
LEARN interrupted?
-
Repeat LEARN.
Refer to «LEARN» for details.
-
Was gas flow stable during
LEARN?
-
Repeat LEARN with stable gas flow.
Refer to «LEARN» for details.
-
Tuning done?
-
Tune valve for application.
-
Refer to «Tuning of control performance» for details.
-
Is sensor range suited for
application?
-
Use a sensor with suitable range (controlled pressure
should be >3% and < 98% of sensor full scale).
-
Noise on sensor signal?
-
Make sure a shielded sensor cable is used.
If you need any further information, please contact one of our service centers. You will find the
addresses on our website: www.vatvalve.com.
