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Alarm
Protection
Code No.
16
Overload
error
Regenerative
18
discharge
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Cause
Overload protection is activated via
the specified time limiting operation
when the integration of a torque com-
mand 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 incor-
rect gains. Cause vibration and/or
abnormal sound.
③ Motor wires connected wrong or
broken
④ The machine is hit against a heavy
thing, 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 capacity of the regenerative dis-
charge resistor.
① When the load inertia is too large,
the converter voltage increases
due to the large energy regener
ated during deceleration, and in
creases more due to the shortage
of energy consumption by the re-
generative discharge
resistor.
② When the velocity of the motor is
too high, the regenerative energy
cannot be consumed within the
Monitor the torque (current wave)
using an oscilloscope to check
whether the torque is surging or not.
Check the
alarm messages.
① Increase the capacity of the driver
and motor. Lengthen the ramp time
of acceleration/deceleration. Re-
duce 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 misma-
tching between the mo
Check the load rate of the regenera-
tive resistor in the Monitor mode. The
driver should not be used with con-
tinuous regenerative braking.
① Check the operation pattern (using
the velocity monitor). Check the
load rate of the regenerative resis-
tor and
the over-regeneration alarm on display.
Increase the capacity of the driver
and motor. Increase the decelera-
tion time. Use an external regen-
erative resistor. Check the connec-
tion wire between B1 and B2 ter-
minals.
② Check the operation pattern (using
the velocity monitor). Check the
load rate of the regenerative resis-
tor and
− 67 −
Countermeasures
load factor and overload
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