16 - 7
Chapter 16 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 QD77MS to operate (excluding when the
"positioning test function" of GX Works2 is used).
• QD77 READY signal [X0]
• Servo READY signal
• Upper limit signal and Lower limit signal
The ON status of signals can be checked by the following monitor data.
• Servo READY signal: "
Md.108
Servo status (high-order buffer memory address)
"
(b0,
b1).
• Upper limit signal and Lower limit signal: "
Md.30
External input signal
" (b0, b1).
Buffer memory address (high-order)
QD77MS2/QD77MS4
QD77MS16
Md.108
Servo status: b0, b1
877+100n 2477+100n
n: Axis No.-1
Check item
Action
Are all the QD77 READY signal
[X0], servo READY signal, and
upper/lower limit signals ON?
Review and correct the sequence program and wiring so
that all the QD77 READY signal [X0], servo READY
signal, and upper/lower limit signals turn ON.
Is there an error in the QD77MS?
(ERR. LED is on or flashing)
Check the error code and take a corrective action.
Is the servo amplifier powered ON? Power on the servo amplifier.
Is there an error in the servo
amplifier?
Check the error code of the servo amplifier and take a
corrective action.
Is the wiring between the QD77MS
and servo amplifier correct?
Check the wiring between the QD77MS and servo
amplifier, and correct it.
Is the wiring between the servo
amplifier and motor correct?
Check the wiring between the servo amplifier 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 cumulative command pulse of
servo amplifier changed after
positioning control is performed?
Refer to the "Servo amplifier Instruction 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.
If a motor does not rotate even after the above items are checked, the possible
cause is a hardware failure.
Please consult your local Mitsubishi representative, explaining a detailed
description of the problem.
Содержание MELSEC-Q QD77MS
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