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MELSEC-Q
15 TROUBLESHOOTING
(2) Troubleshooting when a motor does not rotate
Check items and corrective actions for troubleshooting when a motor does not
rotate are described below.
POINT
The following signals must be ON for the QD75 to operate (excluding when the
positioning test function of GX Works2 is used).
• QD75 READY signal (X0)
• Drive unit READY signal
• Upper limit signal and Lower limit signal
The status of the drive unit READY signal and upper/lower limit signals can be
checked in b0 to b2 of "
Md.30
External I/O signal".
Check item Action
re the QD75 READY signal (X0), drive
unit READY signal, and upper/lower
limit signals ON?
Review and correct the program and wiring so that all the
QD75 READY signal (X0), drive unit READY signal, and
upper/lower limit signals turn ON.
Is there an error in the QD75? (ERR.
LED is on or flashing)
Check the error code and take a corrective action.
Is the drive unit powered ON? Power on the drive unit.
Is there an error in the drive unit?
Check the error code of the drive unit and take a corrective
action.
Is the wiring between the QD75 and
drive unit correct?
Check the wiring between the QD75 and drive unit, and
correct it.
Is the wiring between the drive unit and
motor correct?
Check the wiring between the drive unit and motor, and
correct it.
Is the value in "
Md.20
Current feed
value" changed after positioning control
is performed?
Review the start program.
Is the number of the input pulses for
monitoring changed after positioning
control is performed?
1
Refer to the drive unit operating manual and check that the
function to suppress the motor rotation is not working.
Isn’t the value in "
Md.26
Axis
operation status" "1: Stopped"?
• Review the stop program.
• Check that the stop signal (STOP) is not input.
Does the pulse output mode setting
meet the specifications of the drive
unit?
Set the value in "
Pr.5
Pulse output mode" so that it
satisfies the specifications of the drive unit.
Does the output logic setting of the
command pulse signal meet the
specifications of the drive unit?
Set the value of the logic selection of the command pulse
signal (
Pr.23
Output signal logic selection: b0) so that it
satisfies the specifications of the drive unit.
1: This check item applies only for the drive unit having a monitor function for the number of input
pulses.
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