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 46 of 206
Message Meaning
Solution
Input
pressure
unstable
Pressure was
unstable during
calibration
Check:
Pressure supply stability
Actuator and tubing leaks
Manifold and transducer assembly are tightly coupled to
the enclosure and there are no leaks
Check if the cable between the inner canister and the
pneumatic transducer assembly is tightly connected
Actuator/Valve assembly integrity
Perform a full auto CAL
Call factory for additional support
Low
Pressure
The input
pressure is
below the
minimum input
pressure
specified.
Check if the input pressure gauge is measuring the
expected pressure value
In case you are expecting to use a lo pressure ICoT,
Check if the motor assembly is suitable for Lo
pressure
HALL span
too small
Hall sensor
used to read
position is
unstable
Check:
Hall sensor connector and cable, especially if remote (see
Figure 5-4, connector J8)
Air pressure supply
Can actuator move the valve full span
Check if the cable between the inner canister and the
pneumatic transducer assembly is tightly connected
Check the connector and cable between the transducer
board and the spool valve coil
Magnet
assembly:
o
For rotary magnets check if it is not rotated 90
degrees (see Figure 5-2 & Figure 5-3).
o
For linear magnets, check if the magnet assembly
center is matching the actuator mid position (see
Figure 7-1 & Figure 7-2)
Remove power for at least 1 minute, perform a factory
default (see 17 - Appendix G – Procedure to Reset the
Non-Volatile Memory to Factory Settings) and retry the
calibration
Grounding issues, cable shield is properly grounded;
positioner ground is properly connected to a clean ground
reference.
Sources of electromagnetic noise too close to the sensor
or to the positioner cables, like AC cables for motors,
inverters etc.
Try to replace the Hall sensor and/or the magnet
Call factory for additional support
