Filter
Top Products
58
Position control (Pr. 419 to Pr. 430,
Pr. 464 to Pr. 494)
(1) Position command source selection (Pr. 419)
(2) 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.
1) 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.
2) 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.
3) 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.
4) 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.
• For position control function by contact input, the STF and STR terminals provide the forward (reverse) command
signal. The motor can run only in the direction where the forward (reverse) signal is on.
• Opening STF-SD disables the forward rotation, and opening STR-SD disables the reverse rotation.
• The pulse train is rough during acceleration and fine at the maximum speed.
During deceleration the pulse train is rough and at last there are no pulses.
The motor stops shortly after the command pulses stop. This time lag is necessary for maintaining the stop
accuracy and called stop setting time.
Pr. 419 Setting Description
0
(factory setting)
Position control function by contact input. (using parameters)
1
Position command by pulse train input (when the FR-V5AP is fitted).
(Refer to the instruction manual of the option for details.)
Related parameters
• Servo on signal (LX)
⇒
Set "23" in any of Pr. 180 to Pr. 183 and Pr. 187 (input terminal function selection). (Refer to page 150.)
• In-position signal (Y36)
⇒
Set "36" in any of Pr.190 to Pr.192 and Pr.195 (output terminal function selection). (Refer to page 152.)
Acceleration
[PPS]
Time Deceleration
Stop settling time
Motor speed
Pulse distribution
Droop pulse value
Command pulse
frequency
Motor speed
[r/min]
Pulse train Rough Fine Rough
LX signal
Servo on
STF (STR)
Forward (reverse)
Y36 signal
in-position signal