Encoder Feedback Control - Mitsubishi Electric FR-A820-00046 Instruction Manual

(G) Control parameters
5.16.14

Encoder feedback control

By detecting the rotation speed of the motor with the speed detector (encoder) and feeding it back
to the inverter, output frequency of the inverter is controlled to keep the speed of the motor constant
even for the load change.
Vector control compatible option is required.
Pr.
144
M002
285
H416
359
C141 /
852
C241
367
G240
368
G241
369
C140 /
851
C241
The speed deviation excess detection frequency is used when a vector control compatible option
is mounted and vector control is performed. (For the details, refer to page 5-124.)
These parameters are available when a vector control compatible option is installed.
The parameter number is the one for use with the plug-in option (FR-A8AP/FR-A8APR). (Pr. 369 for
the FR-A8AP only)
The parameter number is the one for use with the control terminal option (FR-A8TP).
5 - 730
Name
Speed setting switchover
Overspeed detection
frequency
Encoder rotation direction
Speed feedback range
Feedback gain
Number of encoder pulses
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Initial
Setting range Description
value
0, 2, 4, 6, 8, 10,
12, 102, 104, Set the number of motor poles for the operation
4
106, 108, 110, by V/F control and the encoder feed control.
112
When the difference between the detected
frequency and the output frequency exceeds the
0 to 30 Hz
set value at the time of encoder feedback control,
9999
an inverter fault (E.MB1) is generated.
9999 Overspeed detection disabled.
Set when using a motor
0
for which forward
rotation (encoder) is
clockwise (CW) viewed
from the shaft.
100
1
Set when using a motor
1
for which forward
rotation (encoder) is
counterclockwise (CCW)
viewed from the shaft.
101
0 to 590 Hz Set the range of speed feedback control.
9999
9999 Disables encoder feedback control
Set when the rotation is unstable or response is
1 0 to 100
slow.
Set the number of encoder pulses output.
1024 0 to 4096
Set the number of pulses before it is multiplied by
4.
Parameters
Set for the operation at
120 Hz or less.
Set for the operation at
a frequency higher than
CW
120 Hz.
Set for the operation at
120 Hz or less.
Set for the operation at
a frequency higher than
CCW
120 Hz.