AMOT 10GEF, Operation And Maintenance Manual, Page: 69 / 80

69
Troubleshooting
OMMG00012 Rev 12 – NOV 2019
Section 8
Troubleshooting
Contents
Para Page
8.1 Checklist .................................................................................. 69
8.1.1 Positioner Status Indicator ............................................... 71
8.1.2 Positioner Error Signal ..................................................... 71
8.2 Positioner Replacement .............................................................. 72
8.1 Checklist
The following table lists a number of possible faults that could be observed in
the system, with the relevant diagnostic and remedial actions.
Fault Indication Diagnostic Action Remedial Action
Valve is oscillating or
moving in large steps
Check PID values on PID
Controller
Adjust PID values
Check dead band settings on
PID Controller
Adjust dead band settings
Check location of
temperature sensor is away
from bends and junctions
(section 7.1, page 57)
Move temperature sensor
Check deadband setting of
the actuator (section 4.6,
page 34)
Adjust deadband setting
Switch off power, remove
actuator lid, and check that
gears are tight (Fig 13, page
40)
Adjust gears
Check coupling pin (Fig 10,
page 30, item 6)
Replace pin
Valve drives in one
direction only
Check electrical connections
Check operation of relays Replace relay
Check power to actuator
Check control system and
temperature sensor
Check setting of
Potentiometer (4.8.7, page
46)
Adjust position feedback
sensor