77
Troubleshooting
OMMGGE00217 Rev 4 – MAY 2019
Section 8
Troubleshooting
Contents
Para Page
8.1 Checklist .................................................................................. 77
8.2 EB Positioner Status Indicators .................................................... 79
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 65)
Move temperature sensor
Check deadband setting of
actuator (section 4.6, page
33)
Adjust deadband setting
Switch off power, remove
actuator lid, and check that
gears or pulleys are tight
(48, page 48)
Adjust gears or pulleys
Check coupling pin (Fig 8,
page 26, 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 Hall Sensor
(4.9.8, page 53)
Adjust position feedback
sensor
On Actuators with a
Positioner, Check status of
LED(s)
Valve will not drive in Check power supply
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