Brainchild P41 User Manual page 51

CPB Configuration : CPB Configuration : The cooling proportional band is measured by %
of PB with range 50~300. Initially set 100% for CPB and examine the
cooling effect. If cooling action should be enhanced then decrease
CPB, if cooling action is too strong then increase CPB. The value of
CPB is related to PB and its value remains unchanged throughout the
auto-tuning procedures.
Adjustment of CPB is related to the cooling media used. For air is Adjustment of CPB is related to the cooling media used. For air is
used as cooling media, adjust CPB at 100(%).For oil is used as used as cooling media, adjust CPB at 100(%).For oil is used as
cooling media, adjust CPB at 125(%). For water is used as cooling cooling media, adjust CPB at 125(%). For water is used as cooling
media, adjust CPB at 250(%). media, adjust CPB at 250(%).
DB Configuration: DB Configuration: Adjustment of DB is dependent on the system
requirements. If more positive value of DB ( greater dead band ) is
used, an unwanted cooling action can be avoided but an excessive
overshoot over the set point will occur. If more negative value of DB (
greater overlap ) is used, an excessive overshoot over the set point
can be minimized but an unwanted cooling action will occur. It is
adjustable in the range -36.0% to 36.0 % of PB. A negative DB value
shows an overlap area over which both outputs are active. A positive
DB value shows a dead band area over which neither output is active.
NOTE : The ON-OFF control may result excessive overshoot and NOTE : The ON-OFF control may result excessive overshoot and
undershoot problems in the process. The P ( or PD ) control will result undershoot problems in the process. The P ( or PD ) control will result
in a deviation process value from the set point. It is recommended to in a deviation process value from the set point. It is recommended to
use PID control for the Heat-Cool control to produce a stable and zero use PID control for the Heat-Cool control to produce a stable and zero
offset process value. offset process value.
Other configuration required: Other configuration required: CYC1, CYC2, O1FT and O2FT
CYC1 is adjusted according to the type of output device. Generally,
select 0.5~2 sec. for CYC1 if solid state relay drive or solid relay is
installed for output1, 10~20 sec. if relay is installed for output1 and
CYC1is ignored if linear output is selected. Similar condition is applied
for CYC2 selection.
See section 3-9 section 3-9
50
for O1FT and O2FT adjustment.
UM0P411A