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9. TROUBLESHOOTING
Phenomena Checkpoint Estimated cause Action
The servo motor
starts immediately
when the servo
amplifier power
supply is turned
on/The servo
motor starts
immediately when
servo-on is
executed.
Check that the servo-on (SON) is
not on.
1. Check with the external I/O
signal display in the diagnostic
mode.
2. Check with the "I/O interface
display" command on the
"Monitor" menu on MR
Configurator.
The servo-on (SON) is on status at
power-on.
1. Review the wiring of the servo-on
(SON).
2. Review the sequence of the
servo-on (SON).
Check the brake release timing for
the servo motor with an
electromagnetic brake.
1. The electromagnetic brake release
sequence is incorrect.
2. The power supply for the
electromagnetic brake is faulty.
1. Review the electromagnetic
brake release sequence.
2. Check the power supply for the
electromagnetic brake.
Check the status of the analog
speed command (VC) and the
analog torque command (TC).
1. Check with the status display.
2. Check with the "Display all"
command on the "Monitor"
menu on MR Configurator.
1. The analog speed command (VC)
and the analog torque command
(TC) has already input at power-on.
2. The offset voltage of the analog
speed command (VC) or the analog
torque command (TC) is incorrect.
Set the offset voltage of the analog
speed command (VC) and the
analog torque command (TC)
properly.
Check the power supply cable of
the servo motor.
An output circuit is open. Review the wiring of the servo
motor power supply cable.
The position is
misaligned at
home position
return.
A certain amount (one revolution)
of misalignment occurs.
The zero pulse detection occurs near
the dog off position. (dog type home
position return)
Adjust the proximity dog installation.
Check the in-position range
(parameter No.PA10).
The in-position range is too large. Set the in-position range smaller
than the current setting.
Check that the proximity dog
signal is set properly.
1. The proximity dog switch is
malfunction.
2. The proximity dog switch is not
installed properly.
1. Repair or replace the proximity
dog switch.
2. Adjust the proximity dog switch
installation.
Check the proximity dog switch
installation.
The proximity dog switch is
misaligned or not installed properly.
Adjust the proximity dog switch
installation.
Check the controller program.
1. The home position address
settings
2. The sequence programs and
others
The controller programs are incorrect. Review the controller programs.