Flowserve 505si Series Digital Positioner - Manual (Page 11)

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User Instructions Logix 505si - LGENIM0505-00 03/09
10 TROUbLESHOOTing LOgix 505Si DigiTAL POSiTiOnERS
Failure Probable Cause Corrective action
No LED is blinking 1. Current source below 3.6 mA
2. Incorrect wiring polarity
1. Verify current source is outputting at least 3,6 mA
2. Check wiring for correct polarity
Unit does not respond
to analog commands
1.Error occurred during calibration 1. Correct calibration error. Recalibrate
Valve position reading is
not what is expected
1. Stroke not calibrated
2. Stem position sensor mounting
is off 180 degrees
1. Recalibrate
2. Orient sensor properly
Position is driven fully
open or closed and will
not respond to command
1. Stroke not calibrated 1. Calibrate valve stroke
2. Inner-loop hall sensor not connected 2. Verify hardware connections
3. Wrong air action set on DIP switch 3. Check ATO (Air-to-open) and ATC
(Air-to-Close) settings. Recalibrate
4. Actuator tubing backward 4. Verify ATO/ATC actuator tubing
5. Electro-pneumatic converter 5. Replace electro-pneumatic converter
malfunctioning
Sticking or hunting
operation of the posi-
tioner
1. Contamination of the electro-
pneumatic converter.
1. Check air supply for proper filtering
and meeting ISA specifcations ISA-7.0.01
2. Control gain set too high 2. Switch to low gain setting