Flowserve 510si IOM Logix User Manual

Page 14

Troubleshooting Logix 510si Digital Positioners

Failure

Probable Cause

Corrective action

No LED is blinking

1. Current source below 3.6 mA

1. Verify current source is outputting at

least 3,6 mA

2. Incorrect wiring polarity

2. Check wiring for correct polarity

Unit does not respond

1.Error occurred during calibration

1. Correct calibration error. Recalibrate

to analog commands

Valve position reading is

1. Stroke not calibrated

1. Recalibrate

not what is expected

2. Stem position sensor mounting

2. 2.Orient sensor properly

is off 180 degrees

Position is driven fully

1. Stroke not calibrated

1. Calibrate valve stroke

open or closed and will

2. Inner-loop hall sensor not connected

2. Verify hardware connections

not respond to command

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

1. Contamination of the electro-

1. Check air supply for proper filtering

operation of the positioner

pneumatic converter.

and meeting ISA specifcations ISA-7.0.01

2. Control tuning parameters not

2. Lower gain switch settings

11 TROUBLE SHOOTING

Logix 510si Status Condition Codes

Colors Identifier

Indication and resolution

R - - -

Any sequence starting with a red light indicates that there is an operational problem with the unit.

RRYY

Bad electronic assembly - replace.

RGRR

Position Deviation – Indicates that he position has exceeded a fixed 20% error between command and
position for a period of time 5 times longer than the recorded stroke time. This error is usually seen when
the positioner is first mounted and powered up before a stroke calibration has been done. If the positioner
is properly calibrated, the air supply is correct, and the linkage is properly adjusted this error normally
indicates that there is a mechanical problem in the positioner, actuator, or valve that is preventing the valve
from stroking properly. If a regulated air supply connected to the actuator properly strokes the valve this

indicates a bad positioner and should be replaced if a calibration does not clear the error.

Version number checking- The version number of the embedded code may be checked at any time except during a
calibration by holding down the ∆ button. This will not alter the operation of the unit other than to change the blink
sequence to 3 blinks indicating the major version number. Holding the ∇ button will give the minor version number
without affecting operation. The version codes are interpreted by adding up the numbers assigned according to the
following table:

Color

First blink value

Second blink value Third blink value

Green

Yellow

Red

For example if holding the ∆ button gave a G-G-R code, and holding the ∇ button gave a Y-Y-G code then the resulting version number
would be (0+0+2).(9+3+0) or version 2.12.