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CHAPTER 4 FUNCTIONS
4
4.4 Manual Reset Function
4.4 Manual Reset Function
The position of the stable condition in P control or PD control can be shifted manually using this function.
By shifting the proportional band (P), an offset (remaining deviation) is manually reset.
The offset is reset by determining and setting the amount to shift the value of the manipulated value (MV) in a stable
condition from the reference value.
The reference value is 50% for standard control, and 0% for heating-cooling control.
This function can be active only in P control and PD control. This function is inactive when integral time (I) is other than 0.
CH Manual reset amount setting (Un\G724, Un\G740, Un\G756, Un\G772) is ignored even if it is set. (Note that a write
data error (error code: 4
H
) occurs if it is outside the setting range.)
(1) Standard control
The set value (SV) is set where the manipulated value (MV) is 50%. Due to this, as long as the temperature
process value (PV) and the set value (SV) is not in equilibrium at 50% of manipulated value, an offset (remaining
deviation) generates.
When an offset generates, the proportional band (P) can be manually shifted by the amount of the offset
(remaining deviation).
Ex.
When using the manual reset function in the following conditions
• Control method: P control
•CH Manual reset amount setting (Un\G724, Un\G740, Un\G756, Un\G772): 300 (30%)
The Q64TCN shifts the manipulated value (MV) by which the temperature is stabilized at the set value
(SV) from 50% to 80%.
Common
Set value (SV)
100%
0%
50%
Input range
Configure the settings
as follows:
Integral time (I): 0
Derivative time (D): 0
Manual reset
Manual reset range: -100.0 to 100.0% (every 0.1%)
(Set -1000 to 1000)
80%
Proportional band
(P)
(Percentage to the full scale)
Manipulated value
(MV)
The manipulated value (MV)
can be moved from 50% to 80%
to keep the set value (SV) stable.