TOHO ELECTRONICS TTM200 - Manual (Page 196)

48-7009-E 6-48
■ Valve motor drive dead band
SEt04
CNt
Setting content Initial value
59 Vdb 0.0 to 100.0 (%) 1.0
Set a range such that the position proportional output is not provided even when the operating amount changes.
The range is represented as a ratio to the proportional band range.
When the proportional band is 200°C and Vdb (valve motor drive dead band) is set to 10.0 %, the actual range is 20°C.
Setting example: In such a case that the range of the valve motor drive dead band is 20°C as shown in the diagram below, no
output is provided when the temperature increases by 20°C.
Then, further increase by 5°C results in the output equivalent to 25 % (= 25°C ÷ 200°C).
When VLt (valve motor stroke time) is 10.0 seconds, the resultant time value is 2.5 seconds.
Temperature
２００
０
ＳＶ＝２００℃
Proportional
band range
200℃
Secondary control
output (close)
Primary control
output (open)
Ａ Ａ
PV increased by +20℃
and further by +5℃
■ Post-AT initial opening ratio
SEt04
CNt
Setting content Initial value
60 ASP 0.0 to 100.0 (%) 50.0
Set the valve opening ratio for a value to be after the auto-tuning is conducted in the position proportional control.
The value of 50 % is normally appropriate.
After the auto-tuning is complete, the calculated operating amount is compared to the set operating amount in order to
determine a first output.