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(2) P Control
P control is a control method in which the manipulated value (MV) is determined proportional to the deviation (E)
between the temperature process value (PV) and set value (SV).
(a) Standard control
The manipulated value is 50% in the following conditions.
• Temperature process value (PV) = Set value (SV)
•CH Manual reset amount setting (Un\G724, Un\G740, Un\G756, Un\G772) is set to 0 (0.0%).
( Page 152, Section 3.4.2 (75))
*1 The actual output value is restricted within the output limiter range set in CH Upper limit output limiter (Un\G42,
Un\G74, Un\G106, Un\G138) and CH Lower limit output limiter (Un\G43, Un\G75, Un\G107, Un\G139). ( Page
110, Section 3.4.2 (19))
*2 The set value (SV) is in the center of the proportional band.
(b) Heating-cooling control
The manipulated value for heating (MVh) and the manipulated value for cooling (MVc) are both 0% in the
following conditions.
• Temperature process value (PV) = Set value (SV)
•CH Manual reset amount setting (Un\G724, Un\G740, Un\G756, Un\G772) is set to 0 (0.0%).
( Page 152, Section 3.4.2 (75))
*1 The actual output value is restricted within the output limiter range set in CH Heating upper limit output limiter
(Un\G42, Un\G74, Un\G106, Un\G138) and CH Cooling upper limit output limiter (Un\G721, Un\G737, Un\G753,
Un\G769). ( Page 110, Section 3.4.2 (19))
(c) Setting method
Among proportional band (P), integral time (I), and derivative time (D), set any value to only proportional band
(P). Set 0 to integral time (I) and derivative time (D).
Manipulated value (MV)
*1
100%
0%
50%
Set value (SV)
*2
Proportional band (P)
Temperature process
value (PV)
100%
0%
Set value (SV)
Heating proportional
band (Ph)
Temperature process
value (PV)
Cooling proportional
band (Pc)
Manipulated value
for heating (MVh)
*1
Manipulated value
for cooling (MVc)
*1