3. TROUBLESHOOTING AND
TROUBLESHOOTING AND RECOVERY
(1) Make sure that the motor is not vibrating.
⇒ If a motor vibrates, the current flowing in it becomes more than
necessary, resulting in an alarm.
(2) Make sure that the power line to the motor is connected correctly.
⇒ If the connection is incorrect, an abnormal current flows in the
motor, resulting in an alarm.
(3) Make sure that the following parameters are set correctly.
⇒ An overload alarm is issued based on the result of calculation of
these parameters. Be sure to set them to the standard values.
Overload protection coefficient (OVC1)
Overload protection coefficient (OVC2)
Overload protection coefficient (OVCLMT)
(4) Attach the check board (A06B–6071–K290) to connector JX5 to
measure the waveform of the actual current (IR and IS) of the servo
amplifier module. Start the motor and measure the actual current (IR
⇒ If the actual current exceeds 1.4 times the rated current, the constant
for the acceleration/deceleration duration is too small,or the load on
the machine is too heavy for the capacity of the motor.
⇒ If the actual current exceeds 1.4 times the rated current during
normal operation, the load on the machine is too heavy for the
capacity of the motor.
This alarm is detailed with alarms 1 and 2 on the servo adjustment screen
0 1 CM alarm (α pulse coder) 1 1
0 1 Pulse coder disconnected (soft ware) 0 0
0 1 Separate pulse coder disconnected (hard ware) 1 1
For the CM alarm, go to 3.3.7.
For software disconnected, go to (1).
For hardware disconnected, go to (3).
(1) For a full–closed Series 0–C system, make sure that the phase C
signal is not connected to full–closed feedback pins 10 to 13. When
the connection is correct, or when the system is not a Series 0–C, go
(2) If there is a large backlash; or if the number of position feedback
pulses divided by the motor one–rotation signal is equal to or less than
640, and a software disconnected alarm is detected when it should
not, change the alarm level.