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Auto 2 calibration (AUTO2)
All parameters necessary to operate valve are set. This calibration is used when YT-2300
is first installed with valve. Refer to the chapter of first auto calibration.
Auto 3 calibration (AUTO3)
All parameters necessary to operate valve are set except zero and end point. This
function is used to re-execute auto calibration without changing zero and end point after
adjusting them manually.
(1) Push <DOWN> at AUTO2 and AUTO3 is displayed.
(2) Push <ENTER> and AUTO3 calibration is started. The next procedure of this
calibration is as same as other calibrations.
BIAS calibration
BIAS means standard value of motor control that is used in positioner. It is affected by
supply pressure, KP and other values and therefore it should be re-adjusted if supply
pressure or KP is changed. Unless this value is correctly set, accuracy can be very low.
(1) Push <DOWN> at AUTO3 mode and BIAS mode is displayed.
(2) Push <ENTER> and BIAS calibration is started. The next procedure of this calibration
is as same as other calibrations.
Velocity calibration (V_0)
This is the function to find the standard value to recognize accurate valve speed. Unless
this value is correctly set, KI control can be slower or impossible. In order to check if
this value is accurately set, push <ESC> at RUN mode and RUN Vel is displayed. At
this time the number on the bottom line on LCD indicates the value close to zero. (After
valve is stopped) Usually the number is between -2 to 2. If the number is over 5,
execute this function again and reset V_0 value.
(1) Push <DOWN> at BIAS mode and V_0 mode is displayed.
(2) Push <ENTEr> and V_0 calibration is started. The next procedure of this calibration is
as same as other calibrations.
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Manual Mode
Manual mode is used to raise or lower the valve stem manually. At this mode valve
stroke is adjusted by only operating buttons not by current input signal. This mode
doesn't affect controlling data registered in YT-2300 and only makes to move valve stem
up and down.
(1) Keep pushing <ENTER> at RUN mode and AUTO CAL message is displayed.
(2) Push <DOWN> and MANUAL mode is displayed.
(3) Push <ENTER> again. Two lines on LCD are appeared. The upper one indicates
valve stroke by percentage and the lower one indicates absolute value of inner resistance
of YT-2300. *MA means that Manual mode is in operation.
(4) Push <UP> or <DOWN> and valve stem moves up or down. Regardless of RA/DA, if
push <UP>, valve stem moves up (in case of linear valve) and if push <DOWN>, valve
stem moves down. In order to make the valve stem move fast, push <ENTER> with
<UP>, <DOWN>.
Button operation for valve stem movement
(5) Push <ESC> and MANUAL mode is displayed.
⇨
⇨
⇨
(1) Push <ENTER>
(2) Push <DOWN>.
(3) Push <ENTER>.
for 6 seconds.
⇨
⇨
⇨
(4) Push <UP>,<DOWN>.
(4) Push <ESC>.
(5)
MANUAL
mode
Push <UP>.
Valve stem is up slowly.
Push <UP> + <ENTER> at the same time.
Valve stem is up quickly.
Push <DOWN>.
Valve stem is down slowly.
Push <DOWN>+<ENTER> at the same time. Valve stem is down quickly.