Flowserve 3400IQ Digital Positioner - Manual (Page 76)

Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
6
15 Troubleshooting
Table XVIII: Troubleshooting
Failure Probable Cause Corrective Action
No LED is
blinking
Voltage of supply source is not high enough
Verify that voltage source can supply at
least 9 V
Current draw incorrect
Verify current draw of device (23 mA) and
that of other devices on the loop aren’t
pulling too much current
Erratic
communica-
tions
Maximum cable length or cable impedance
exceeded
Check cable conduction size, length and
capacitance. Refer to Section 6.4, “Cable
Requirements”
Improper grounding Terminate and ground segment properly.
Interference with I.S. barrier Must use FF-compatible I.S. barrier
Host FB card not configured or connected
correctly
Check connections and configurations of
card
Unit does not
respond to
Final Value
commands
Unit is in Auto mode Put in OOS mode
Error occurred during calibration
Check blink codes on positioner and correct
calibration error. Recalibrate
Valve position
reading is
not what is
expected
Positioner tubing backwards Re-tube the actuator
Stem position sensor mounting is off 180° Remount position sensor
Stroke not calibrated Perform RE-CAL
Tight shutoff is active Verify settings using PC or handheld software
Customer characterization or soft stops
active
Verify customer characterization and soft
stops