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Heat only PID control : Set
or
for OUT1 and non-zero
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
control result is still unsatisfactory, then perform manual tuning to improve
the control. See section 3-11 for manual tuning. The unit contains a
very clever PID and fuzzy algorithm to achieve a very small overshoot
and very quick response to the process if it is tuned properly.
Cool only control: ON-OFF control, P ( or PD ) control and PID
control can be selected for cool only control through Output 1. Set
OUT1 to
,
or
, the other functions for cool only
ON-OFF control, cool only P ( PD ) control and cool only PID control
are same as descriptions for heat only control except that the output
variable ( and action ) for the cool control is inverse to the heat
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 (%)
PB1 or PB2
Case 1
100%
0%
Output 1
CPB
Output 2
DB
negative
(overlap)
48
UM0P411A
Output 2
Output 1
Process value