Brainchild P41 User Manual page 49

Heat only PID control : Set Heat only PID control : Set
value of proportional band and integral time. Perform auto-tuning to value of proportional band and integral time. Perform auto-tuning to
the new process, or set correct values for PB1, TI1 and TD1. If the the new process, or set correct values for PB1, TI1 and TD1. If the
control result is still unsatisfactory, then perform manual tuning to improve control result is still unsatisfactory, then perform manual tuning to improve
the control. See section 3-11 for manual tuning. The unit contains a the control. See section 3-11 for manual tuning. The unit contains a
very clever PID and fuzzy very clever PID and fuzzy
and very quick response and very quick response
Cool only control: ON-OFF control, P ( or PD ) control and PID Cool only control: ON-OFF control, P ( or PD ) control and PID
control can be selected for cool only control through Output 1. Set control can be selected for cool only control through Output 1. Set
OUT1 to OUT1 to
ON-OFF ON-OFF control, control,
are same as descriptions for heat only control except that the output are same as descriptions for heat only control except that the output
variable ( and action ) for the cool control is inverse to the heat variable ( and action ) for the cool control is inverse to the heat
control. control.
Heat - Cool control: Heat - Cool control: Three types of combination for heat-cool
control are available as shown in table 3.1. The case1~case3 in
Fig 3.3 show the heat PID and cool PID operation. The case 4
show the heat PID and cool ON-OFF operation.
Output
Power (%)
Case 1 Case 1
100%
0%
48
algorithm to achieve a algorithm to achieve a
to the process if it is tuned properly. to the process if it is tuned properly.
, , or or
cool only P ( PD ) cool only P ( PD )
PB1 or PB2
Output 1
Output 2
or or for OUT1 and non-zero for OUT1 and non-zero
, the other functions for , the other functions for
control and control and
CPB
Process value
DB
negative
(overlap)
UM0P411A
very small overshoot very small overshoot
cool only cool only
cool only PID cool only PID
Output 2
Output 1
control control