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Mitsubishi Electric FR-CS84-012 Instruction Manual Page 154

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Pr.
Name
132
PID lower limit
A602
133
PID action set point
A611
134
PID differential time
A615
 Basic configuration of PID control
 Pr.128 = "20 or 21" (measured value input)
Set point
To outside
 PID action outline
 PI action
PI action is a combination of proportional action (P) and integral action (I), and applies a manipulated amount according to the
size of the deviation and transition or changes over time.
[Example of action when the measured value changes in a stepped manner]
Set point
Deviation
Measured value
P action
Time
I action
Time
PI action
Time
(Note) PI action is the result of P and I actions being added together.
 PD action
PD action is a combination of proportional action (P) and differential action (D), and applies a manipulated amount according
to the speed of the deviation to improve excessive characteristics.
[Example of action when the measured value changes proportionately]
Set point
Deviation
Measured value
action
P
Time
D
action
Time
PD action
Time
(Note) PD action is the result of P and D actions being added together.
Initial value
Setting range
0 to 100%
9999
9999
0 to 100%
9999
9999
0.01 to 10 s
9999
9999
Deviation signal
+ -
*1
Terminal 1
Kp
0 to
10 VDC
(0 to
5 V)
Feedback signal (measured value)
Kp: Proportionality constant Ti: Integral time S: Operator Td: Differential time
Description
Set the lower limit. The FDN signal is output when the measured
value falls below the setting range. The maximum input (20 mA/5 V/
10 V) of the measured value is equivalent to 100%.
No function
Set the set point during PID control.
Set point set by Pr.128.
With deviation ramp input, this is the time (Td) used for obtaining the
manipulated amount only by proportional action (P). Response to
changes in deviation increase greatly as the differential time
increases.
The differential control is disabled.
Inverter circuit
Manipulated
PID operation
variable
1
1+
+Td S
Ti S
Motor
M
5. PARAMETERS
5.10 (A) Application parameters
2
2
3
4
5
6
7
8
9
10
153

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