Mitsubishi Electric A1SD75P1-S3 User Manual page 47

2 SYSTEM CONFIGURATION
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Precautions for using stepping motor
When configuring the positioning system using a stepping motor, the following
points must be observed. Refer to section "12.6.6 Stepping motor mode functions"
for details.
(1) Setting the stepping motor mode
(a) When using a stepping motor with the AD75, the stepping motor mode
must be set.
If the stepping motor mode is not set, the stepping motor cannot be
controlled correctly.
(b) When the stepping motor mode is set, there will be limits to the control
method and positioning address, etc.
(2) Sharing of bias speed at starting
When using the stepping motor, by selecting the stepping motor mode and
setting the bias speed for starting, the motor rotation can be started smoothly.
(3) S-pattern acceleration/deceleration use inhibited
S-pattern acceleration/deceleration is not possible when using the stepping
motor. The motor may step out if used.
(4) Circular interpolation control inhibited
Circular interpolation control cannot be used when using the stepping motor.
An "Control method setting error" (error code: 524) will occur if used.
Precautions for using 3-axis module
When configuring a positioning system using a 3-axis module (A1SD75P3-S3,
AD75P3-S3), the following precautions must be observed.
(1) No. of FROM/TO commands executed in one scan
(Refer to section "6.1 Precautions for creating program" for details.)
The No. of FROM/TO commands (during 16-bit transmission), DFRO/DTO
commands (during 32-bit transmission) and special function module device
(U \G ) executed in one scan will be as follows.
•
When carrying out circular interpolation control or S-pattern
acceleration/deceleration: 4 times/axis
•
When CHG signal is simultaneously input for two axes with speed/position
changeover control: 4 times/axis
•
Control other than the above: 10 times/axis
(2) Execution of speed/position changeover control
If there is a timing at which the CHG signal is input simultaneously for 3 axes
with the speed/position changeover control, split the AD75. (Example: Split
into 1-axis and 2-axis.)
When using the stepping motor, this can cause step out.
Furthermore, machine vibration could occur because of the frequency
fluctuation.
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MELSEC-A