5/12/2017
TECH-538/D.W.O. 23160
Page 173 of 189
Message
Meaning
Solution
Posit. span
too small or
wrong
magnet .
1-Position
Sensor used to
read position is
not mounted
correctly.
2- No air supply
pressure
3- The valve
stroke (angular
or linear is too
small)
Check:
The position sensor (Hall-effect sensor) connector and cable. .
See Figure 5-1 and find the connector J6 for local or remote
sensor connection for the ICoT 5400. See
Figure 6-3 and find the connectors J3 and J4 for remote
sensor connection for the ICoT 6400. The connector J2 is
used for local sensor connection for the ICoT 6400.
•
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
o
For linear magnets, check if the magnet assembly
center is matching the actuator mid position.
•
Remove power for at least 1 minute, perform a factory
default initialization (see Section 9.2.2.4) 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 Position Sensor and/or the magnet.
•
Call Westlock- for additional support.
