Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 30

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).
■Standard PID control
The manipulated value (MV) is 50% in the following conditions.
• Temperature process value (PV) = Set value (SV)
Manipulated value (MV)
100%
50%
0%
*1 A value to be actually output is within the output limiter range set in "Upper limit output limiter" and "Lower limit output limiter" of "Limiter
setting" in "Application Setting".
*2 The set value (SV) is the center of the proportional band (P).
■Heating-cooling PID control
The manipulated value for heating (MVh) and the manipulated value for cooling (MVc) are both 0% in the following conditions.
• If the overlap/dead band set value is 0 using temperature process value (PV)= set value (SV)
Manipulated value
for heating (MVh)
100%
0%
Heating proportional band (Ph) Cooling proportional band (Pc)
*1 A value to be actually output is within the output limiter range set in "Upper limit output limiter" and "Lower limit output limiter" of "Limiter
setting" in "Application Setting". (Page 78 Application Setting)
■Setting method
Make the settings as described below.
• 'CH1 Integral time (I) setting' (Un\G432): 0 to 0 (s) (Page 136 CH1 Integral time (I) setting)
• 'CH1 Derivative time (D) setting' (Un\G433): 0 to 0 (s) (Page 137 CH1 Derivative time (D) setting)
PI control
PI control is a control method in which derivative elements are added to P control, and thereby corrects an offset (remaining
deviation) that remains when the temperature is stable. By setting the integral time (I) properly, the temperature process value
(PV) matches the set value (SV).
■Setting method
Make the settings as described below.
• 'CH1 Derivative time (D) setting' (Un\G433): 0 to 0 (s) (Page 137 CH1 Derivative time (D) setting)
4 FUNCTION
28
4.3 Control Method
*1
*2
Set value (SV)
Proportional band (P)
Manipulated value
*1
for cooling (MVc)
Set value (SV)
Temperature
process value (PV)
*1
Temperature process value (PV)