Mitsubishi A1SD75M1, User Manual

Page: 113 / 746

5 - 23
MELSEC-A
5 DATA USED FOR POSITIONING CONTROL
Pr.2 to Pr.4 Movement amount per pulse
Set the movement amount per pulse count when outputting a position/speed
command from the AD75. The setting is made with Pr.2 to Pr.4 . (The case
for the " Pr.1 Unit setting" is "mm" is explained below.)
The movement amount per pulse is expressed with the following expression.
Movement amount per rotation (Al)
Movement amount per pulse =
No. of pulses per rotation (Ap)
* When carrying out positioning, an error (mechanical error) could occur between
the designated movement amount and actual movement amount. In that case,
the error can be compensated with the "movement amount per pulse". (Refer to
section "12.3.2 Electronic gear function".)
POINT
If the movement amount per pulse is less than 1, command speed variations will
occur.
Smaller setting will increase variations and may cause machine vibration.
Make setting so that the movement amount per pulse is 1 or greater.
Pr.2 No. of pulses per rotation (Ap)
Set the number of pulses required for the motor shaft to rotate once (resolution per
servomotor revolution).
No. of pulses per revolution (Ap) = Resolution per servomotor revolution
Set this parameter to 16384 when using the encoder of 16384 pulses or more with
the MR-J2S-B.
Set this parameter to 8192 when using the MR-J2-03B5.
[Table 1]
Pr.1 setting value
Value set with peripheral device
(unit)
Value set with sequence program
(unit) *
0 : mm
0.1 to 6553.5 (
µ
m)
1 to 65535 (
×
10
-1
µ
m)
1 : inch 0.0001 to 0.65535 (inch)
1 to 65535 (
×
10
-5
inch)
2 : degree 0.00001 to 0.65535 (degree) 1 to 65535 (
×
10
-5
degree)
3 : pulse 1 to 65535 (pulse) 1 to 65535 (pulse)
* 1 to 32767 : Set as a decimal
32768 to 65535 : Convert into hexadecimal and set
Pr.