RKC INSTRUMENT RB Series User Manual

6. OPERATIONS OF THE BASIC FUNCTIONS
IMR02C15-E4 6-11
6.3 Startup Tuning (ST)
Startup tuning (ST) is a function which automatically computes and sets the PID values (Proportional
band: heat-side only) from the response characteristics of the controlled system at power ON, transfer
from STOP to RUN, and Set value (SV) change.
• As simple autotuning, the PID values can be found in a short time without disturbing controllability
for controlled systems with slow response at power ON.
• For controlled systems which require different PID values for each temperature setting, the PID values
can be found for each Set value (SV) change.
Time
Temperature
Set value (SV)
Starup tuning (ST) start
[When the pow er is turned on, operation is changed
from STOP to RUN
]
Calculating and setting PID values
Calculating and setting PID values
Startup tuning (ST) start
[When SV is changed]
Set value (SV)
[Change]
• The setting items related to Startup tuning (ST) are shown below. Set them according to the
application used.
Setting item Details Setting mode
Start
condition
0 (Factory set value)
When the power is turned on, operation is
changed from STOP to RUN, or the Set value
(SV) is changed.
Engineering mode
1
When the power is turned on or operation is
changed from STOP to RUN.
2 When the Set value (SV) is changed.
Execution 0 (Factory set value) ST unused
method 1 Execute once
Parameter setting
mode
2 Execute always
When the Startup tuning (ST) function is activated in Heat/Cool PID control, only heat-side
PID values are calculated and changed (the Proportional band [cool-side] is not calculated).
 Caution for using the Startup tuning (ST)
• For Startup tuning (ST) at power ON or transfer from STOP to RUN, always set the heater power to
ON simultaneously with the start of tuning or before the start of tuning.
• Start Startup tuning (ST) in the state in which the temperature differential of the Measured value
(PV) and Set value (SV) at the start of Startup tuning (ST) is twice the Proportional band, or
greater.
• If in Heat/Cool PID control, start activating the Startup tuning (ST) function under the condition of
“Set value (SV) > Measured value (PV).” Only the PID values on the heat-side are automatically
calculated but no PID values on the cool-side are changed. Execute the Autotuning (AT) function to
the PID valued on the cool-side.
• When the manipulated output value may be limited by the Output limiter setting, the optimum PID
values may not be calculated by Startup tuning (ST).
• When setting the Setting change rate limiter, the optimum PID values are not obtained even when
Startup tuning (ST) is executed at Set value (SV) change.

RKC INSTRUMENT RB Series Specifications

General

Brand	RKC INSTRUMENT
Model	RB Series
Category	Temperature Controller
Language	English