Brainchild C21 User Manual page 55

The PID Heat-Cool is used for the above example.
To achieve this set the following parameters in the Setup Menu:
INPT=PT.DN INPT=PT.DN
UNIT= C UNIT= C
DP= 1-DP DP= 1-DP
OUT1=REVR OUT1=REVR
O1TY=RELY O1TY=RELY
CYC1=18.0 (sec.) CYC1=18.0 (sec.)
O1FT=BPLS O1FT=BPLS
OUT2=COOL OUT2=COOL
O2TY=4-20 O2TY=4-20
O2FT=BPLS O2FT=BPLS
Adjust SV at 120.0 C , CPB at 125 ( % ) and DB at -4.0 (%). Adjust SV at 120.0 C , CPB at 125 ( % ) and DB at -4.0 (%).
Apply Apply Auto-tuning Auto-tuning
values. values. See Section 3-11. See Section 3-11.
Adjustment of CPB is related to the cooling media used. If water is Adjustment of CPB is related to the cooling media used. If water is
used as cooling media instead of oil, the CPB is set at 250 (%). If air is used as cooling media instead of oil, the CPB is set at 250 (%). If air is
used as cooling media instead of oil, the CPB is set at 100 (%). used as cooling media instead of oil, the CPB is set at 100 (%).
Adjustment of DB is dependent on the system requirements. More Adjustment of DB is dependent on the system requirements. More
positive value of DB will prevent unwanted cooling action, but will positive value of DB will prevent unwanted cooling action, but will
increase the temperature overshoot, while more negative value of DB increase the temperature overshoot, while more negative value of DB
will achieve less temperature overshoot, but will increase unwanted will achieve less temperature overshoot, but will increase unwanted
cooling action. cooling action.
L L
L L
L L
at 120 C for a new system to get an optimal PID at 120 C for a new system to get an optimal PID
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