STI DigitalTrak2 - Measurement Span Is Insufficient; User Characteristics Setting Error; Feedback over Limits; Input Current out of Work Range

INSTRUCTION MANUAL
DigitalTrak2™
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STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 4054 – rev.00 02/2021 – DT2 - 18 -
Display:
Solution:
Check the air supply pressure
In manual control mode, check whether the valve can be moved up and down
Check if the pneumatic output have gas
5.5.4 Measurement span is insufficient
During the positioner tuning, the feedback range is less than 20.0.
Display:
Solution:
Adjust the slider on the control rod components, making the feedback value range greater than 20.0.
5.5.5 User characteristics setting error
When the user defines the characteristics profile of the valve, the characteristics is non-monotonic up / down.
Display:
Solution:
Reset the parameters. Check positioner and valve connections
5.5.6 Feedback over limits
Feedback value is> 110% or <-10%.
Display:
Solution:
Check feedback sensor and, if necessary, replace the sensor.
Re-initialize the positioner.
5.5.7 Input current out of work range
If the input current value is greater than 21.6mA (>110%) or less than 3.8mA (<-10%).
Display:
Solution:
Check the input signal.
5.5.8 Actuator error
For some reason, the positioner cannot drive the valve to a specific position.
Display:
Solution:
Cleaning valve.
Check the valve connected institutions.