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35
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AT sensitivity setting
Character
Name
Description
Initial Value
1
SET3
CNT
Setting Mode Selection
Screen
Control Parameter Mode
Settings about Control
11
AT
AT start/stop
OFF
Stop AT
ON
Start AT
※
Start or stop AT by pressing the F key.
OFF
■
Proportional band setting for OUT1
Character
Name
Description
Initial Value
1
SET3
CNT
Setting Mode Selection
Screen
Control Parameter Mode
Settings about Control
12
P1
Proportional band
setting for OUT1
Setting Range: 0.1–200.0
Setting Unit: % that corresponds to
SLL
-
SLH
3
0
Sets the proportional band for Output 1.
In case of heating and cooling controls, the proportional band of the heating side will be set.
See the figure shown below on how the proportional band will be placed during the heating control. In case of cooling control,
the proportional band will be placed on top.
Proportional bandwidth can be calculated by the following formula:
Proportional Bandwidth = (SLH - SLL) x P1
SLH: Maximum Limit of SV Limiter
SLL: Minimum Limit of SV Limiter
Example: If SLH=1200°C, SLL=0°C, and P1=3.0%, then:
(1200°C -0°C)×3% = 36°C
Output gradually increases from the point where the temperature gets lower than SV by 36°C.
In general, setting the proportional band wider will make the startup slow.
If the proportional band is narrow, on the other hand, the startup is faster but may cause instability of control, such as
overshooting and hunting.