NSK M-EGA-15A2301, User Manual

Page: 200 / 237

8.Maintenance Trouble shooting when alarm activated
8-10
■
Alarm code 42 (Overload 2)
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
■
Rotation is less than 50min-1 and
torque command exceeds approx.
2 times of rated torque.
■
Check if torque command exceeds
approx. 2 times of the rated
torque-by-torque command monitor
(TCMON). If any of the conditions (load
condition when motor stops, operation
condition at low velocity, and load
condition) exceeds twice the rated torque,
review operation or load condition. Or
replace with larger sized motor.
3
■
Defect in motor-driver combination
■
Check the motor type setting and the
motor in use are matching. If not, correct
them.
4
■
Holding brake of motor does not
release.
■
Check that wirings and voltage for holding
brake are correct. If not, repair them. If
they are appropriate, 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.