Mitsubishi Electric FR-A800, Instruction Manual

Page: 348 / 1042

Position control under vector control and PM sensorless vector control Parameters
5 - 168
Roll feed mode (Pr. 1293)
●
If the roll feed mode is enabled in an application that needs repeated positioning in the same
direction, such as a conveyor, positioning can be performed repeatedly without position com-
mand overflow.
●
When the roll feed mode is enabled (Pr. 1293="1"), the position where the first position command
is created is set as the home position and the droop pulses are cleared.
When Pr. 1293="1", simple positioning is available even if home position return cannot be
completed.
●
Positioning modes with which the roll feed mode can be enabled:
– Point table mode
– Home position return mode
– JOG mode
●
Basic operation example
Input/output signals for point table positioning
I002827E
Fig. 5-65: Basic operation of roll feed mode
Input/
output
Signal name Function
Pr. 178 to
Pr. 189
setting
Pr. 190 to Pr. 196
setting
Positive
logic
Negative
logic
Input
X76 Proximity dog
ON: dog ON
OFF: dog OFF
76
⎯
X87 Sudden stop
When turned ON, the motor
decelerates and stops according to
Pr. 464.
87
⎯
Output
MEND Travel completed
Turns ON when the position
command operation has completed
while the number of droop pulses is
within the positioning completion
width.
⎯
38 138
ZA
Home position
return failure Turns ON while the home position
return warning occurs.
⎯
56 156
PBSY
During position
command
operation
Turns ON during position command
operation.
⎯
61 161
ZP
Home position
return completed Turns ON after home position return
operation is complete.
⎯
63 163
Tab. 5-60: Input/output signals for point table positioning
0 1000 1000 0
Position
command speed
Point table
selection signal
Servo-ON (LX)
Start signal (STF)
Indication of
position command
or current position