151
CHAPTER 8 FUNCTIONS
8
8.
3 T
e
mperat
ure Cont
rol
M
ode
(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 (MV) is 50% in the following conditions.
• Temperature process value (PV) = Set value (SV)
• CH
Manual reset amount setting (address: 112H, 142H, 172H, 1A2H) is set to 0 (0.0%). (
*1
The value actually output is within the output limiter range set in CH
Upper limit output limiter (address: 105H, 135H,
165H, 195H) and CH
Lower limit output limiter (address: 106H, 136H, 166H, 196H). (
*2
The set value (SV) is in the center of the proportional band (P).
(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 (address: 112H, 142H, 172H, 1A2H) is set to 0 (0.0%). (
*1
The value actually output is within the output limiter range set in CH
Heating upper limit output limiter (address: 105H,
135H, 165H, 195H) and CH
Cooling upper limit output limiter (address: 1C5H, 1CAH, 1CFH, 1D4H). (
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
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