WESTLOCK CONTROLS CORPORATION
280 N. MIDLAND AVE., STE. 258, SADDLE BROOK, NJ 07663 TEL: 201-794-7650 FAX: 201-794-0913
www.westlockcontrols.com
10/5/2013
TECH-477/D.W.O. 21424
Page 45 of 206
Message Meaning
Solution
Valve
position
unstable
Position is
unstable or
oscillating too
much during
calibration
Check:
Hall sensor connector and cable, especially if remote (see
Figure 5-4, connector J8)
Pressure supply stability
Actuator and tubing leaks
Magnet assembly in correct position and tightly coupled
Set-point
stability
Actuator/Valve assembly integrity
Sources of electromagnetic noise too close to the sensor
or to the positioner cables, like AC cables for motors,
inverters etc.
Perform a full auto CAL
Call factory for additional support
HALL
sensor rail
error
Position error
during PID
calibration
Check:
Hall sensor connector and cable, especially if remote (see
Figure 5-4, connector J8)
Pressure supply stability
Actuator and tubing leaks
Perform a full auto CAL
Call factory for additional support
PID gain
error
PID calibration
was not able to
find proper gain
values and
control the valve
position
Check:
Hall sensor connector and cable, especially if remote (see
Figure 5-4, connector J8)
Pressure supply stability
Actuator and tubing leaks
Actuator/Valve assembly integrity
Perform a full auto CAL
Remove power for at least 1 minute, perform a factory
default (see Appendix I) and retry a full auto CAL
Call factory for additional support
Transducer
PWM error
During
calibration an
error occurred
with the PWM
signal that
control the
spool-valve
driver
Check:
Cable between the inner canister and the pneumatic
transducer assembly is tightly connected
Cable and connector between the transducer board and
the spool-valve coil
Perform a full auto CAL
Remove power for at least 1 minute, perform a factory
default (see Appendix I) and retry the calibration
Call factory for additional support