Yokogawa digitalYEWFLO (DY) - Manual (Page 98)

<10. OPERATION>
10-4
IM 01F06A00-01EN
1. Tuning method
(1) Ensure the condition of fl owrate
The necessary condition for tuning function is zero
fl ow.
(2) Executing the tuning function.
Set “ TUNING AT ZERO” of “K25:N.B MODE”.
Wait more 30 second.
(3) Finishing the tuning functions
Using the BT200
(a) Press “DATA” key of BT200 function key.
(b) Ensure the indication of “MANUAL” which is
“K25:N.B MODE”
(“NOW TUNING” is indicated during tuning
operation.)
Using the indicator
(a) Press “SHIFT” and “SET” key
simultaneously.
(b) Press “SET” key and ensure “01” of Lower
indication.
(“02” is indicated during tuning operation.
Execute (a), (b) once again.)
2. TLA value
TLA values is possible to change after executing
“TUNING”. In this case, minimum fl owrate is
increased.
Minimum fl owrate for TLA value is given by below
equation.
Minimum Flowrate
after changing TLA
Value Specified Minimum
Flowrate TLA Value after Tuning
TLA initial value or defalt value
F1004.ai
Ensure minimum fl owrate for changing TLA value.
3. Output
After tuning, ensure that the indication reads is zero
where no fl uid is fl owing.
If the indication reads over zero is done
continuously, retry the tuning and ensure the below
condition.
Does high vibrations occur in pipeline?
In this case, refer to Section 3.1 “Installation
Precautions”, and keep the pipeline properly.