When The Motor Does Not Stop; When Positioning Cannot Be Executed - Mitsubishi Electric MELSEC Q Series User Manual

14.2.2

When the motor does not stop

Check item
Is the QD73A1's zero adjustment performed properly?
Is the servo amplifier's zero adjustment performed properly?
Is a large value set to the gain value of the servo amplifier?
Are the speed command terminal on the QD73A1 and the
servo amplifier connected properly?
(when the motor does not stop even though the speed
command from the QD73A1 is 0V)
Is there noise effect?
14.2.3

When positioning cannot be executed

Check item
Is PLC READY signal
(Y2D) off?
Is Servo READY signal
(X1B) off?
Is the ERR. LED on?
Is the BUSY LED off?
Is Excessive error signal
(X17) on?
Is External stop signal
(X1D) on?
Is WDT error, H/W error
signal (X10) on?
Are the QD73A1 and the
drive unit connected
properly?
246
Turn on PLC READY signal (Y2D).
• Turn on Servo READY signal.
• Check if there is any error on the servo amplifier.
• Check if the QD73A1 and the servo amplifier are wired properly.
Read out the error code, and take the corrective action described in the error code list.
( Page 252, Section 14.3.4)
[Double-check the sequence program.]
• Check if an interlock is made at a start.
• Check if Stop signal (Y27) is on.
• Check if the start is kept reset.
• Check if the start signal is kept on.
[Check the QD73A1's status.]
• Check if the QD73A1 is mounted on the base unit properly.
• Check if the position setting is proper.
The accumulated pulse amount is outside the setting range.
• Check if the accumulated pulse setting is proper. (
• Check if the multiplication setting is proper. (
• Check if the encoder I/F setting is proper. (
• Check if the gain adjustment is proper. (
• Check if the QD73A1 and the encoder are connected properly. (
• Check if Stop signal (Y27) is on.
• Check if Stop signal (STOP) is on.
If WDT error, H/W error signal (X10) stays on even after resetting the CPU module, please consult your local
Mitsubishi representative.
Check if the QD73A1 and the drive unit are wired properly.
Perform zero adjustment. (
Refer to the manual for the servo amplifier, and perform zero adjustment.
Refer to the manual for the servo amplifier, and adjust the gain value of the
servo amplifier to a proper value.
Connect the speed command terminals properly.
• Place signal lines away from power cables.
• Use shielded twisted pair cables for signal lines.
• Ground cables without fail.
• Place the motor away from noise source.
Action
Page 102, Section 6.2.2)
Page 104, Section 6.2.3)
Page 105, Section 6.2.6)
Page 59, Section 4.5)
Action
Page 59, Section 4.5)
Page 66, Section 4.6.2)