Multi Loop Controller
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● ON/OFF control setting and Hysteresis (HYS)
If proportional band (PB) is set to “0”, control method is changed from PID control to ON/OFF
control. For ON/OFF control, Hysteresis value is applied and setting can be completed at HYS
parameter.
OFF
ONON
OFF OFF
Output
SV
HYS
PV
Run
start
● Proportional Band (PB), Integral Time (TI), Differential time (TD)
Constant to control PID. These parameters are set up automatically if auto tuning (AT) is performed
● Auto tuning (AT)
Normally, for 2 DOF P.I.D control, Values of P.I.D constants such as proportional band (PB), integral
time (TI), differential time (TD) should be set to targeted temperature value of equipment to be
controlled, and proper values be applied. If auto tuning (AT) parameter is set to “1”, P.I.D constants
is automatically set up after pre-set control run is performed, and after AT parameter is changed to
“0”, P.I.D constant value applied control starts.
If auto tuning (AT) parameter is set to “1”, corresponding channel mode is changed to run mode,
run setting (R/S) is set to “1”, and it becomes run start (RUN) state.
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