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CHAPTER 14 TROUBLESHOOTING
14
14.2 Troubleshooting
14.2.4 When a positioning error occurs
14.2.4 When a positioning error occurs
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?
Check item Action
Do the position errors occur by regular amount?
[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. ( Page 102, Section 6.2.2)
• Check the multiplication setting. ( Page 104, Section 6.2.3)
[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.
Is the motor rotating smoothly?
Check if the feedback pulse frequency is within 1Mpulse/s using an
oscilloscope.
Is there noise effect?
• 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.
Check item Action