Flowserve ValveSight Diagnostics User Manual

Page 53

ValveSight Diagnostics for HART User Manual FCD VSENSF0001-02-AQ 03/15

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Indicator

Implications

Possible Solutions

Default

Settings

Enable/

Disable

Refer to DTM

Screen

Blink

Code

MPC Active

Mode

Indicates that tight shutoff (MPC) is

active. The command is beyond the user

set limit for tight shutoff feature. This

is a normal condition for all valves when

closed. The factory default setting triggers

this at command signals below 1%. This

indication may also occur on 3 way valves

at both ends of travel if the high MPC

value has been set.

If tight shutoff is not desired,

reset the tight shutoff limits to

the correct values or adjust the

command signal inside of the

specified MPC value.

110%

and 1%

Configuration

> Custom

> Position

Cutoff

GGGY

Local Inter-

face Enabled/

Disabled

Indicates PC software has been used to

disable the local interface. This code is

only present for a short time when the

QUICK-CAL button is pressed.

If local control is desired then

the local interface must be

re-enabled from the remote

software.

N/A

Configura-

tion> Basic/

Local Inter-

face

GGYG

Error History

Reset Alert

Indicates that a flag has been set for the

position to clear its internal history. The

positioner will automatically reset the flag

once the history has been cleared.

N/A

Alarms >

Alarm Status

None

16 Actuation Ra-

tio Warning

Indicates a decreased ability of the system

to actuate the valve. It is based on the

ratio of available force to required force to

actuate. It is affected by the process load,

friction, spring force, and available supply

pressure.

Increase the supply pressure.

Reduce the friction. Check the

actuator spring. Re size the

actuator, Adjust user set limits.

Start

90%

End

100%

Yes

Health >

Actuator

Health

YYYY

Pneumatic In-

ability to Fail

Safe Warning

Indicates that upon loss of air supply,

the valve may not move to the fail-safe

position. The spring alone is not adequate

to overcome the friction and process load

in the system. The system is relying on

pneumatic force to actuate in the direction

the spring is pushing. The fail-safe spring

may have failed or was not sized properly

for the application. Friction or process

load may have increased.

Check for high friction. Repair or

replace actuator spring. Reduce

process load.

N/A

Yes

Health >

Actuator

Health

YRRR

Friction High

Warning

Indicates the valve/actuator friction has

passed the user-set limit. High friction

can cause loop oscillations, poor position

control, jerky motion, or valve sticking.

It can be caused by build-up from the

process on the stem, trim or seat by

a failing bearing or guides in the valve

and actuator, galling of the trim or stem,

excessively tightened packing, linages or

other valve/actuator mechanical issues.

Determine if the friction is

significantly interfering with the

valve control. If not, consider

increasing the friction warning

limit. Consider the following to

reduce friction: Stroke the valve

to clear off build up. Clear any

external mechanical obstruc-

tion, loosen the packing, clean

the stem, repair or replace the

actuator. Highly localized friction

or very jerky travel can indicate

internal galling. Repair or replace

internal valve components.

10,000

lbs

Yes

Health >

Valve Health

YRYG

Friction Low

Warning

Indicates the friction has passed below

the user-set limit.

Check for packing leak. Tighten

or replace the valve packing.

0 lbs.

Yes

Health >

Valve Health

YRGY

Friction High

Alarm

Indicates the valve/actuator friction has

passed the user-set limit. The alarm

indicates a more severe condition than

the warning. High friction can cause

loop oscillations, poor position control,

jerky motion, or valve sticking. It can be

caused by build-up from the process on

the stem, trip, or seat by a failing bearing

or guides in the valve and actuator, calling

of the trim or stem, excessively tightened

packing, linkages, or other valve/actuator

mechanical issues.

Determine if the friction is

significantly interfering with the

valve control. If not, consider

increasing the friction warning

limit. Consider the following to

reduce friction: Stroke the valve

to clear off build up. Clear any

external mechanical obstruc-

tion, loosen the packing, clean

the stem, repair or replace the

actuator. Highly localized friction

or very jerky travel can indicate

internal galling. Repair or replace

internal valve components.

10,000

lbs.

Yes

Health >

Valve Health

RRGR