Mitsubishi Electric FR-A700 Instruction Manual page 309

Parameter
Control block diagram
Command
pulse
Fig. 6-38: Control block diagram
Example of operation
The speed command given to rotate the motor is calculated to zero the difference between the
number of internal command pulse train pulses (when Pr. 419 = 0, the number of pulses set by
parameter (Pr. 465 to Pr. 494) is changed to the command pulses in the inverter) and the
number of pulses fed back from the motor end encoder.
● When a pulse train is input, pulses are accumulated in the deviation counter and these droop
pulses act as position control pulses to give the speed command.
● As soon as the motor starts running under the speed command of the inverter, the encoder
generates feed back pulses and the droop of the deviation counter is counted down. The
deviation counter maintains a given droop pulse value to keep the motor running.
● When the command pulse input stops, the droop pulses of the deviation counter decrease,
reducing the speed. The motor stops when there are no droop pulses.
● When the number of droop pulses has fallen below the value set in Pr. 426 "In-position
width", it is regarded as completion of positioning and the in-position signal (Y36) turns on.
FR-A700 EC
Pr. 4–6
Pr. 465–Pr. 494
Pr. 24– 27
travel
Pr. 232– 239
Multi-speed,
communication
Pr. 7 Pr. 8
Pr. 44, Pr. 110
Pr. 44, Pr. 110
Command pulse selection
Pr. 428
Position command
source selection
Pr. 419
Position command
acceleration/
deceleration time
constant
Pr. 424
Electronic
gear
Pr. 420
Pr. 421
Position control by vector control
Position feed
forward command
filter
Position feed
forward gain
Pr. 425
Pr. 423
Position
loop
gain
Speed
Pr. 422
control
Deviation
counter
Pr. 429
Differentiation
Clear signal
selection
M
3~
I001535E
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