Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 932 / 1218

(G) Control parameters Parameters
5 - 730
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.
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).
Pr. Name
Initial
value
Setting range Description
144
M002
Speed setting switchover 4
0, 2, 4, 6, 8, 10,
12, 102, 104,
106, 108, 110,
112
Set the number of motor poles for the operation
by V/F control and the encoder feed control.
285
H416
Overspeed detection
frequency
9999
0 to 30 Hz
When the difference between the detected
frequency and the output frequency exceeds the
set value at the time of encoder feedback control,
an inverter fault (E.MB1) is generated.
9999 Overspeed detection disabled.
359
C141 /
852
C241
Encoder rotation direction 1
0
Set when using a motor
for which forward
rotation (encoder) is
clockwise (CW) viewed
from the shaft. Set for the operation at
120 Hz or less.
100
Set for the operation at
a frequency higher than
120 Hz.
1
Set when using a motor
for which forward
rotation (encoder) is
counterclockwise (CCW)
viewed from the shaft. Set for the operation at
120 Hz or less.
101
Set for the operation at
a frequency higher than
120 Hz.
367
G240
Speed feedback range 9999
0 to 590 Hz Set the range of speed feedback control.
9999 Disables encoder feedback control
368
G241
Feedback gain 1 0 to 100
Set when the rotation is unstable or response is
slow.
369
C140 /
851
C241
Number of encoder pulses 1024 0 to 4096
Set the number of encoder pulses output.
Set the number of pulses before it is multiplied by
4.
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
CW
CCW