FIELDVUE Instrumentation IssuesFIELDVUE Instrumentation Issues Steve Hagen

FIELDVUE Product Marketing Manager

[File Name or Event]Emerson Confidential27-Jun-01, Slide 2

Slide 2

DVC6000 - Customer IssuesDVC6000 - Customer IssuesDVC6000 - Customer IssuesDVC6000 - Customer Issues Severe service valve applications Feedback linkage failure on critical valves High temperature applications Dirt or desiccant in air Moisture in air Potentiometer wear

[File Name or Event]Emerson Confidential27-Jun-01, Slide 3

Slide 3

O-rings hardened or out of placeO-rings hardened or out of placeO-rings hardened or out of placeO-rings hardened or out of place Air escaping past o-rings due to various

reasons. Leaking around any pressure-containing

component (I/P, Relay, PWB pressure sensors, housing/module base).

Causes the DVC6000 to be sluggish and less responsive to input signal changes.

[File Name or Event]Emerson Confidential27-Jun-01, Slide 4

Slide 4

Moisture invasion Moisture invasion Moisture invasion Moisture invasion

Moisture in the supply air can destroy EVERY DVC6000 component.

Can make a “gurgling” sound while operating.

[File Name or Event]Emerson Confidential27-Jun-01, Slide 5

Slide 5

Dirt in the Supply AirDirt in the Supply AirDirt in the Supply AirDirt in the Supply Air

#1 “Killer” of an I/P Converter May sound like intermittent air output

[File Name or Event]Emerson Confidential27-Jun-01, Slide 6

Slide 6

Travel SensorTravel SensorTravel SensorTravel Sensor

DVC Travel Sensor: Provides travel reading from the

actuator to pwb. Out of 360o rotation, only 90o is

valid for travel readings (with ~15° “slop” on either side).

All of the Travel Sensor Calibration routines direct you to locate the feedback arm rotation from “A” to “B” within this 90o valid window. Anything outside this arc is invalid. .75 1 1.5 2

A

.75 1

1.5 2

A

B90o valid

travel range

“A” position

“B” position

90o valid travel range

invalid travel area

0 Ω

12K Ω

CW 20° 150° 170° 360° CCW

45K Ω

”A” ”B”