When A Positioning Error Occurs - Mitsubishi Electric MELSEC Q Series User Manual

Check item
Is proper wave output
displayed when the
QD73A1's speed command
terminal is connected to an
oscilloscope?
If proper wave output is not displayed, please consult your local Mitsubishi representative.
Is proper wave output
displayed when the drive
unit's encoder output
terminal is connected to an
oscilloscope?
14.2.4

When a positioning error occurs

Check item
Do the position errors occur by regular amount?
Is the motor rotating smoothly?
Is there noise effect?
Action
[Double-check the parameters.]
• Check if the set position is proper according to the machine position.
• Check the positioning parameters and positioning data.
• Check the accumulated pulse setting. (
• Check the multiplication setting. (
[Double-check the sequence program.]
• Check if a proper address is set.
• Check if a proper value is set for a current value change.
• Check if a stop signal is input.
• Check if the set movement amount is too small for operation in the speed-
position control switch mode.
Check if the feedback pulse frequency is within 1Mpulse/s using an
oscilloscope.
• Place signal lines away from power cables.
• Use shielded twisted pair cables for signal lines.
• Ground cables without fail.
• Place each device in the system away from noise source.
CHAPTER 14 TROUBLESHOOTING
Action
Page 102, Section 6.2.2)
Page 104, Section 6.2.3)
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