Mitsubishi Electric MELSEC iQ-R Series - Page 1142

1140
9 PID OPERATION INSTRUCTION
9.1 Overview
Integral time: (s3)+4
Setting range: 0 to 32767 [ 100ms] (0 = ) (No integration)
PID control: Integral action
The integral time (T
I
) is the time from when an deviation occurs in integral action to when the output of the integral action
becomes the output of proportional action.
Reducing the integral time (T
I
) accelerates the integral operation.
Ex.
PI action in the case of cooling (direct action)
Derivative gain: (s3)+5
Setting range: 0 to 200 [%]
PID control: Derivative action
The output of the derivative action is filtered. The derivative gain (K
D
) affects only the derivative action.
• If the derivative gain (K
D
) is decreased, the output responds instantaneously to a change in the process value (PV) caused
by a disturbance.
• If the derivative gain (K
D
) is increased, the output takes time to respond to a change in the process value (PV) caused by a
disturbance.
First, set the derivative gain (K
D
) to 0 and adjust it using the input filter (). If the change in the output
responds too sensitive to the disturbance, increase the value.
Integral time (T
I
): 0 < T
I3
< T
I2
< T
I1
: Temperature
SV: Set value
MV: Manipulated value
t: Time
T
I2
T
I3
T
I1
T
I1
T
I2
T
I3
t
t
SV
MV

PV by P action
PV by PI action
Output by PI action
Output by P action