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.
Summary of Contents for MELSEC-Q QD77MS
Page 1: ......
Page 27: ...A 26 MEMO...
Page 29: ...MEMO...
Page 101: ...3 34 Chapter 3 Specifications and Functions MEMO...
Page 232: ...5 111 Chapter 5 Data Used for Positioning Control MEMO...
Page 315: ...5 194 Chapter 5 Data Used for Positioning Control MEMO...
Page 337: ...6 22 Chapter 6 Sequence Program Used for Positioning Control...
Page 338: ...6 23 Chapter 6 Sequence Program Used for Positioning Control...
Page 339: ...6 24 Chapter 6 Sequence Program Used for Positioning Control...
Page 340: ...6 25 Chapter 6 Sequence Program Used for Positioning Control...
Page 341: ...6 26 Chapter 6 Sequence Program Used for Positioning Control...
Page 342: ...6 27 Chapter 6 Sequence Program Used for Positioning Control...
Page 343: ...6 28 Chapter 6 Sequence Program Used for Positioning Control...
Page 344: ...6 29 Chapter 6 Sequence Program Used for Positioning Control...
Page 345: ...6 30 Chapter 6 Sequence Program Used for Positioning Control...
Page 346: ...6 31 Chapter 6 Sequence Program Used for Positioning Control...
Page 347: ...6 32 Chapter 6 Sequence Program Used for Positioning Control...
Page 348: ...6 33 Chapter 6 Sequence Program Used for Positioning Control...
Page 349: ...6 34 Chapter 6 Sequence Program Used for Positioning Control...
Page 353: ...6 38 Chapter 6 Sequence Program Used for Positioning Control...
Page 354: ...6 39 Chapter 6 Sequence Program Used for Positioning Control...
Page 357: ...6 42 Chapter 6 Sequence Program Used for Positioning Control...
Page 359: ...6 44 Chapter 6 Sequence Program Used for Positioning Control...
Page 360: ...6 45 Chapter 6 Sequence Program Used for Positioning Control...
Page 361: ...6 46 Chapter 6 Sequence Program Used for Positioning Control...
Page 363: ...6 48 Chapter 6 Sequence Program Used for Positioning Control...
Page 364: ...6 49 Chapter 6 Sequence Program Used for Positioning Control...
Page 413: ...MEMO...
Page 433: ...8 20 Chapter 8 OPR Control MEMO...
Page 458: ...9 25 Chapter 9 Major Positioning Control MEMO...
Page 593: ...10 30 Chapter 10 High Level Positioning Control MEMO...
Page 625: ...11 32 Chapter 11 Manual Control MEMO...
Page 659: ...12 34 Chapter 12 Expansion Control MEMO...
Page 767: ...13 108 Chapter 13 Control Sub Functions MEMO...
Page 813: ...14 46 Chapter 14 Common Functions MEMO...
Page 831: ...15 18 Chapter 15 Dedicated Instructions MEMO...
Page 846: ...16 15 Chapter 16 Troubleshooting MEMO...
Page 892: ...16 61 Chapter 16 Troubleshooting MEMO...
Page 971: ...Appendix 62 Appendices MEMO...
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