NSK M-EGA-15A2301, User Manual

Page: 199 / 237

8.Maintenance Trouble shooting when alarm occurs
8-9
■
Alarm code 41 (Overload 1)
Status at the time of alarm
Cause
1 2 3 4 5 6 7
Issued at input of servo ON.
✔
After command input, issued without rotating the motor.
✔ ✔ ✔
After command input, brief motor rotation
✔ ✔ ✔ ✔ ✔
◆
Corrective actions
Cause Investigation and corrective actions
1
■
Defect in internal circuit of driver.
■
Replace the driver.
2
■
Effective torque exceeds the rated
torque.
■
Monitor the load status using motor
usage ratio monitor (TRMS), and check
if effective torque exceeds the rated
value. Or, calculate the motor effective
torque from load conditions and
operation conditions. If the effective
torque is excessive, check the
operating or loading, or replace the
capacity of the large motor.
3
■
Defect in motor-driver combination.
■
Check if the motor in use matches with
the recommended type, and replace if
it is improper.
4
■
Holding brake of motor does not
release.
■
Check that the wiring and voltage of
the holding brake are acceptable; if
not, repair. If the above are OK,
replace the motor.
5
■
Wiring of U/V/W
–
phase between
driver and motor do not match.
■
Check the wiring conditions and
restore if improper.
6
■
One or all connections of U/V/W
-phase wiring of driver/ motor is
disconnected.
■
Check the wiring conditions and
restore if improper.
7
■
Machines collided.
■
Check the operating conditions and
limit switch.
✔
During the alarm caused by conditions in #2 (above), if OFF

ON of power supply control is repeated,
there is a risk of burning out the motor. Wait for longer than 30 min. for cooling purposes after power
shut OFF, and resume operations.