Specifications

WESTLOCK CONTROLS CORPORATION
280 MIDLAND AVENUE, SADDLE BROOK, NJ 07663 TEL: [phone] FAX: [phone]
www.westlockcontrols.com
1/12/10 TECH-439/D.W.O. 19024 Page 38 of 58
7.2 LCD error messages
The ICoT positioner has built-in diagnostics that allow the user to identify and resolve
most of the common installation and operation problems. The following table lists the
available messages, their meaning and recommended solutions:
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 3-4, 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 3-4, connector J8)
 Pressure supply stability
 Actuator and tubing leaks
 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
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 3-4, 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