B5 Pi Function; Pi Block Diagram; Pi Setpoint Options - YASKAWA P7 User Manual

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b5 PI Function

The capability to accept an analog signal as feedback for a PI (Proportional + Integral) control function is built into the Drive.
D1-04
D1-02
b1-01
4
D1-01
3
Option Card
Serial Com
2
1
1 0
PI Differential
Fdbk. H3-09=16
Terminal A1
MEMOBUS Reg. 06H
PI target value
Constant b5-19
0
Terminal A1
1
PI Differential
Fdbk. H3-09=16
0
Terminal A2
1
H3-09=B
PI Feedback 2
(U1-53)
The analog feedback to the Drive for the PI control is via the A2 terminal. The Drive must be programmed (H3-09= "B: PI
Feedback") to use terminal A2 as feedback for the PI functionality of the Drive.
The PI setpoint can be configured to come from one of many different inputs or parameters. The table below describes the
options for originating the PI setpoint.
Frequency Reference
using multi-step
command
Frequency reference
(U1-01)
Scaling
PI SFS cancel
o1-03
H1-xx=34
1
0
PI SFS
b5-17
1
0
Reg. 0Fh, bit 1
1
0
PI Set Point
b5-20
(U1-38)
b5-18
Scaling
1 0
Scaling
PI Differential
Fdbk. H3-09=16
b5-20
PI SFS cancel
H1-xx=34
1
+
0
-
PI SFS
b5-17
PI Feedback
(U1-24)
Scaling
b5-20
H3-09=16
b5-28
1 0
+
0
1
-
1 b5-29
0
P
PI Differential
Fdbk. H3-09=16
Table 1 PI Setpoint Options
The PI Setpoint
will be read from:
Parameter b5-19
Modbus Register
06H
D1-01
Terminal A1
Serial Comm.
Option PCB
b5-01=0
b5-01=3
OFF
b5-01=1
ON
PI control is OFF under the following
conditions:
- b5-01=0
- During JOG command input
- H3-xx=19 and the terminal status is H1
ON
PI Input
(U1-36)
PI Input
Characteristic
Caracteristic
I - limit
I-time
H1-xx=35
b5-03
0
0
+
P
1/t
+
Z 1
-1
Proportional
1
gain
Integral Hold
b5-02
H1-xx=31
Sleep function
selection b5-21 PI Snooze Function
+
2
+
0 or 1
0 1
b5-24
PI Differential PI Wake Up Level
Fdbk. H3-09=16
PI offset
(b5-07)
Fig. 15 PI Block Diagram
If these conditions are true
Status of
Status of Modbus
b5-18 Register
0Fh bit 1
= 1 N/A
= 0 ON
= 0 OFF
= 0 OFF
= 0 OFF
= 0 OFF
Programming 5 - 15
Enable / Disable reverse operation
when PI output is negative
Upper limit
Fmax x109%
+
0
+
b5-11
Lower limit 0
1
Upper limit
Fmax x109%
Lower limit
Fmax x109%
PI delay time
b5-04
b5-08
0
+ +
1/t
1
PI Limit
PI Output
Z
-1
b5-06
Integral Reset
Characteristic
H1-xx=30
PI Differential
Fdbk. H3-09=16
PI
+
Wake Up
-
Status of
b1-01
N/A
N/A
= 0
= 1
= 2
= 3
Sleep function
selection b5-21
2
1
+
RUN
b5-16
0
-
on/off
Delay
Timer
b5-15
Sleep Level
Sleep Function
Output
frequency
SFS
Sleep function
selection b5-21
2 0 r o 1
+
PI
b5-23
-
Snooze
Delay
b5-22
Timer
PI Snooze Level
PI Snooze Function
PI Output
Gain
0
+
b5-10
+
Z -1
1
b5-09
1
0
1
0
b5-30
b5-07
PI offset
PI output monitor
(U1-37)