Flowserve Logix MD+ ValveSight - Manual (Page 110)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
110
•
Possible Solutions: Set the limit to a lower or higher value if more
travel is needed, or adjust the command signal back in the specified
range.
Command Frequency
•
Definition: The frequency of the command signal is above the warning
or alarm limit. This could mean the control loop is oscillating faster than
normal.
•
Possible Solutions: Verify the limits are set at an appropriate level.
Review the control loop parameters and equipment. Adjust as
necessary.
Command Amplitude
•
Definition: The amplitude of the command signal is above the warning
or alarm limit. This could mean the control loop has larger swings than
desirable.
•
Possible Solutions: Verify the limits are set at an appropriate level.
Review the control loop parameters and equipment. Adjust as
necessary.
Position Frequency
•
Definition: The frequency of the position signal is above the warning or
alarm limit. The positioner is controlling the position of the valve with
rapid corrections.
•
Possible Solutions: Verify the limits are set at an appropriate level.
Adjust the selectable Gain switch to a lower setting or use the "Hi
Friction" setting. Perform a QUICK-CAL which sets the gains based on
valve response. Check for high friction. If the problem persists replace
the relay.
Position Amplitude
•
Definition: The amplitude of the position signal is above the warning
limit. The positioner is controlling the position of the valve with large
corrections.
•
Possible Solutions: Verify the limits are set at an appropriate level.
Adjust the selectable Gain switch to a lower setting or use the "Hi
Friction" setting. Perform a QUICK-CAL which sets the gains based on
valve response. Check for high friction. If the problem persists replace
the relay.