6. OPERATIONS OF THE BASIC FUNCTIONS
IMR02C15-E4
6-12
Requirements for Startup tuning (ST) start
Start the Startup tuning (ST) when all following conditions are satisfied:
PID control
Operation state
RUN
ST is set to ON. (Execute once, Execute always)
Parameter setting
Output limiter high ≥ 0.1 %, Output limiter low ≤ 99.9 %
[Heat/Cool control type: Output limiter high (heat-side) ≥ 0.1 %]
The Measured value (PV) is not underscale or over-scale.
At ST at setting change, the Measured value (PV) shall be stabilized.
Input value state
Set value (SV) > Measured value (PV) [Heat/Cool PID control]
Output value state
At startup, output is changed and saturated at the Output limiter high or the Output limiter
low [Heat/Cool control type: Output limiter high (heat-side)].
Requirements for Startup tuning (ST) cancellation
If the Startup tuning (ST) is canceled according to any of the following conditions, the controller
immediately changes to PID control. The PID values will be the same as before Startup tuning (ST)
was activated.
When the Autotuning (AT) is activated.
When the RUN/STOP mode is changed to the STOP mode.
Operation state
When the Auto/Manual mode is changed to the Manual mode.
When Startup tuning (ST) is set to “0 (ST unused).”
When the PV bias or the PV digital filter is changed.
Parameter changing
When the Output limiter value is changed.
Input value state When the Measured value (PV) goes to underscale or over-scale.
Startup tuning (ST) execution time When the Startup tuning (ST) does not end in hundred minutes after
Startup tuning (ST) started
Power failure When the power failure of more than 20 ms occurs.
(10 ms or more for RB100 with 24V AC/DC power supply.)
Instrument error When the instrument is in the FAIL state.
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