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Parameter mode (PARAM)
Parameter types
There are four types in parameter of Dead Zone, KP, KI, KD.
These values are reflected as soon as they are changed, therefore the appropriate values
are found with checking valve's motion by real time.
Dead Zone (dEAdZONE)
This is the section of Error % that I control is not operated. If there are hunting or
oscillation continuously due to the friction between stem and packing, they are prevented
with this parameter.
KP
This is proportion constant value of correction that is correcting by Error %. If this value
is too big, there can be hunting though it finds position by input signal. If the value is
too small, accuracy gets worse.
KI
This is integral constant value adding or subtracting the correction that is correcting by
Error % on previous correction signal. If this value is too big, there can be oscillation. If
it is too small, the time to find the exact position gets longer.
KD
This
is
differential
constant
value
adding
previous
correction
signal
with
changing
correction signal by Error % change rate.
Adjustment of Parameter
Dead zone (dEAdZONE)
(1) Push <ENTER> at RUN mode for 6 seconds and AUTO CAL message is appeared.
(2) Push <DOWN> twice and PARAM mode is displayed.
(3) Push <ENTER> and dEAdZONE mode is displayed.
(4) Push <ENTER> again and *EAdZONE message is appeared.
(5) Adjsut dEAdZONE value by <UP> or <DOWN>. Adjusted value is applied right away
without additional operation, so users can easily check its adjustment by changing current
input signal to YT-2300. It means that optimum control value is found by adjusting values
during valve operation.
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(6) Push <ENTER> to save the value. +EAdZONE message is on LCD.
(7) Push <ESC> three times to return to RUN mode.
⇨
⇨
⇨
(1) Push <ENTER>
(2) Push <DOWN> twice.
(3) Push <ENTER>.
for 6 seconds.
⇨
⇨
⇨
⇨
(4) Push <ENTER>.
(5) Push <ENTER>
(6) Push <ESC>.
after adjustment
by <UP>, <DOWN>.
⇨
(7) Push <ESC> twice.
RUN
Mode
KP
(1)-(3) Adjustment method and procedure is as same as dEAdZONE.
(4) Push <DOWN> at dEAdZONE mode and KP mode is displayed.
(5) Push <ENTER> and *KP message is on LCD.
(6) Adjust KP values with <UP> or <DOWN>. Adjusted value is applied right away
without additional operation, so users can easily check its adjustment by changing current
input signal to YT-2300. It means that optimum control value is found by adjusting values
during valve operation.
(7) Push <ENTER> to save the value. +KP message is on LCD.
(8) Push <ESC>.
(9) Push <ESC> twice to return to RUN mode.
⇨
⇨
⇨
(1) Push <ENTER>
(2) Push <DOWN> twice.
(3) Push <ENTER>.
for 6 seconds.
