Mitsubishi Electric MELSEC-Q QD75M User Manual page 748

15 TROUBLESHOOTING
Related buffer memory address
Axis 1 Axis 2 Axis 3
— — —
Regenerative resistor brake option
30102 30202 30302
Optional function 1
30123 30223 30323
— — —
— — —
— — —
Auto tuning
30108 30208 30308
Servo response
30109 30209 30309
Input signal logic selection
31 181 331
— — —
— — —
Check point
Axis 4
—
30402
30423
—
—
—
30408
30409
481
—
When the servomotor shaft is
rotated with the servo off,
the cumulative feedback pulses
— should vary in proportion to the
rotary angle. If the indication skips
or returns midway the encoder if
faulty.
Change the drive unit.
Change the DRU parameter value to within the
setting range.
Change the servo amplifier.
Set correctly.
• Change the drive unit or cooling fan.
• Reduce ambient temperature.
The drive method is reviewed.
Change the drive unit or cooling fan.
Review environment so that ambient temperature
is 0 to 40°C.
• Reduce load.
• Review operation pattern.
• Use servomotor that provides larger output.
Change the servomotor.
• Reduce load.
• Review operation pattern.
• Use servomotor that provides larger output.
• Repeat acceleration/deceleration to execute
" Pr.108 Auto tuning".
• Change " Pr.109 Servo response" setting.
• Set " Pr.108 Auto tuning" to OFF and make gain
adjustment manually.
• Review operation pattern.
• Install limit switches.
Connect correctly.
Change servomotor.
15 - 85
MELSEC-Q
Corrective action