Emerson Fisher 4320 Manuál s instrukcemi stáhnout pdf (Strana 61)

Instruction Manual

D103621X012

4320 Position Monitor

April 2014

Table 5. Instrument Troubleshooting

Symptom Possible Cause Action

1. Actuator does not move

1a. No (or low) supply air pressure 1a. Check supply air pressure

1b. Air connections are incorrect for actuator type 1b. Correct air connections

2. Display shows “Span Error” when performing a

manual calibration

2a. Rotary feedback magnet is off 90_ 2a. Rotate feedback magnet 90_ in either

direction

2b. Linear or arched array travels outside of

marked range, as indicated by the white end

marks on the array and the mid point on the back

of the 4320 housing. See page 20.

2b. Adjust array and travel to fall within range of

array end marks. See page 20.

3. Actuator moves once during automatic

calibration and then stops

3a. Rotary feedback magnet is off 90_ 3a. Rotate feedback magnet 90_ in either

direction

3b. Linear or arched array travels outside of

marked range, as indicated by the white end

marks on the array and the mid point on the back

of the 4320 housing. See page 20.

3b. Adjust array and travel to fall within range of

array end marks. See page 20.

3c. Actuator not reaching stable position 3c. Adjust supply pressure to ensure that actuator

reaches end-stops

4. No response / excessive calibration time when

performing Automatic Calibration

4a. Rotary feedback magnet is off 90_ 4a. Rotate feedback magnet 90_ in either

direction

4b. Linear or arched array travels outside of

marked range, as indicated by the white end

marks on the array and the mid point on the back

of the 4320 housing. See page 20.

4b. Adjust array and travel to fall within range of

array end marks. See page 20.

4c. Actuator not reaching stable position 4c. Adjust supply pressure to ensure that actuator

reaches end-stops

Replacing the instrument

To replace an instrument that has been previously mounted to a control valve, perform the following basic steps:

Instrument Removal

Remove the bolts connecting the 4320 housing to the mounting bracket.

Note

The magnet assembly may remain on the valve stem (or shaft).

When replacing the instrument, be sure to follow the appropriate mounting procedure. Once the instrument is

mounted, perform the calibration routine before putting back in to service.

WARNING

During calibration the valve will move full stroke. To avoid personal injury and property damage caused by the release of

pressure or process fluid, isolate the valve from the process and equalize pressure on both sides of the valve or bleed off the

process fluid.

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