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MELSEC-Q
15 TROUBLESHOOTING
Related buffer memory address
Axis 1 Axis 2 Axis 3 Axis 4
Error
check
timing
Error
process-
ing
Check point Corrective action
— — — —
• Reduce load.
• Review operation pattern.
• Use servomotor that provides
larger output.
Auto tuning
30108 30308 30508 30708
Auto tuning response
30109 30309 30509 30709
— — — —
• 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.
Input signal logic selection
31 181 331 481
• Review operation pattern.
• Install limit switches.
— — — —
Connect correctly.
— — — —
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 servomotor.
Input signal logic selection
31 181 331 481
• Review operation pattern.
• Install limit switches.
— — — —
Connect correctly.
Auto tuning
30108 30308 30508 30708
Auto tuning response
30109 30309 30509 30709
— — — —
• 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.
— — — —
Always
Imme-
date stop
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 servomotor.
:
The error check timing is shown below.
• When servo amplifier is power ON.
• When the QD75MH detects the rising edge (OFF
ON) of the PLC READY signal [Y0].
• When servo amplifier is reset.
• When the QD75MH is power ON.