Encoder Feedback Control (Pr. 144, Pr. 285, Pr. 359, Pr. 367 To Pr. 369) - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
6.24.6 Encoder feedback control (Pr. 144, Pr. 285, Pr. 359, Pr. 367 to
Pr. 369)
This controls the inverter output frequency so that the motor speed is constant to the load var-
iation by detecting the motor speed with the speed detector (encoder) to feed it back to the
inverter. For this function the Option FR-A7AP is necessary.
Pr. No. Bedeutung
144
Speed setting switchover
Overspeed detection
frequency
285
(Speed deviation excess
detection frequency)
Encoder rotation
359
direction
367
Speed feedback range
368
Feedback gain
Number of encoder
369
pulses
When exercising vector control with the FR-A7AP, this parameter changes to excessive
speed deviation detection frequency.
The above parameters can be set when the FR-A7AP (option) is mounted.
FR-A700 EC
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Initial Setting
Description
Value Range
Set the number of motor poles
0/2/4/6/8/10/
4 102/104/106/ when performing encoder feed-
108/110
back control under V/f control.
If (detected frequency) - (output
frequency) > Pr. 285 during
0–30Hz encoder feedback control, the
9999
inverter alarm (E.MB1) is pro-
vided.
9999 Overspeed is not detected.
0
Encoder
Clockwise direction as viewed from
A is forward rotation.
1
1
Encoder
Counter clockwise direction as viewed
from A is forward rotation
Set the region of speed feedback
0–400Hz
control.
9999
Encoder feedback control is
9999
invalid
Set when the rotation is unstable
1 0–100
or response is slow
Set the number of pulses of the
1024 0–4096
encoder before multiplied by four.
Special operation
Parameters referred to
81 Number of motor
pole
Refer to
Section
6.7.2
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