Panasonic minas a series Operating Manual page 68

Alarm
Protection
Code No.
Overload protection is activated via the
16
Overload
specified time limiting operation when the
error
integration of a torque command exceeds
the specified overload level. Caused by a
long operation with a torque that exceeds
the specified torque limit.
1) Long operation with more load and
torque than the rating.
2) Vibration or hunting due to incorrect
gains. Cause vibration and/or abnormal
sound.
3) Motor wires connected wrong or broken
4) The machine is hit against a heavy hing,
or suddenly becomes heavy in operation.
The machine is en tangled.
5) The electromagnetic brake is ON.
6) In a system of multiple drivers, some
motors are wired incorrectly to other axis.
The regenerative energy is larger than the
Regenerative
18
capacity of the regenerative discharge re-
discharge sistor.
1) When the load inertia is too large,the
converter voltage increases due to the
large energy regener ated during decel-
eration, and in creases more due to the
shortage of energy consumption by the
regenerative discharge resistor.
2) When the velocity of the motor is too high,
the regenerative energy cannot be con-
sumed within the
Cause
- 67 -
Countermeasures
Monitor the torque (current wave) using an
oscilloscope to check whether the torque is
surging or not. Check the
overload alarm messages.
1) Increase the capacity of the driver and
motor. Lengthen the ramp time of accel-
eration/deceleration. Reduce the motor
load.
2) Readjust the gains.
3) Correct the motor wiring per the wiring
diagrams. Replace cables.
4) Free the machine of any tangle .
Reduce the motor load.
5) Measure the voltage at the brake wiring
connections. Turn off the brake.
6) Correct the motor and encoder wiring to
eliminate the mismatching between the
mo
Check the load rate of the regenerative re-
sistor in the Monitor mode. The driver
should not be used with continuous regen-
erative braking.
1) Check the operation pattern (using the
velocity monitor). Check the load rate of
the regenerative resistor and the over-re-
generation alarm on display.
Increase the capacity of the driver and
motor. Increase the deceleration time.
Use an external regenerative resistor.
Check the connection wire between B1
and B2 terminals.
2) Check the operation pattern (using the
velocity monitor). Check the load rate of
the regenerative resistor and
load factor and