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41
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8.3.3 PV Start
PV start functions at multi SP switching or at turning on the power
during ramping or multi SP execution. However, it is limited to cases
in which the down rate setting is not 0 (OFF) if PV > target SP and the
up rate setting is not 0 (OFF) if PV < target SP at beginning of PV
start. At beginning of PV start, SP becomes equal to PV and then
ramping is executed for the target multi SP with the setting up/down
rate. If PV display is H or L (outside the range of PV error upper and
lower limit values), ramping is executed from SP = 0.
8.3.4 Anti-Overshoot
It functions when SP is changed in steps or ramped, and suppresses
overshoot near the target SP. It functions only when the control mode
is single output type and PID control.
8.4 Automatic Tuning
Output is changed as 0
100% (lower output limit upper output
limit for current output) to measure the process property from the change
in process variable.
Tuning is started by selecting
,
(subjecting 1st output in dual
output) or
(subjecting 2nd output in dual output) is selected in
on Operation screen, and TUNE lamp blinks. Tuning is stopped
when
is selected during automatic tuning, and PID does not
change. In addition, it changes automatically to
when tuning is
completed, and TUNE lamp goes OFF.
[Caution] Precautions in automatic tuning
The process value (i.e.: furnace temperature) increases/decreases
when tuning is executed. Be sure to check that there is no hitch for the
system or product before executing.
Summary of Contents for EC5500R
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