8-8
8-3 Troubleshooting
Troubleshooting
8
14
Overcurrent
The current on the inverter circuit
exceeded the specified value.
1 The Servo Drive has failed.
(Failure of circuit, IGBT parts, etc.)
2 Short circuit on Servomotor lines U,
V, and W.
3 Ground fault on the Servomotor
lines.
4 Servomotor burnout.
5 Contact failure on the Servomotor
lines.
6 The dynamic brake relay has been
consequently welded.
7 The Servomotor is not compatible
with the Servo Drive.
8 The operation command input is
received simultaneously with or
before Servo-ON.
1 If the alarm is triggered
immediately when the Servo Drive
is turned ON with the Servomotor
lines disconnected, replace the
Servo Drive.
2 Check for short circuit in the
Servomotor lines U, V, and W.
Connect the Servomotor lines
correctly.
3 Check the insulation resistance
between Servomotor lines U, V, W
and the ground line. If there is
insulation failure, replace the
Servomotor.
4 Measure the interphase
resistances of the Servomotor. If
they are unbalanced, replace the
Servomotor.
5 Check the connector pins for
connections U, V, and W of the
Servomotor. If they are loose or
have come off, securely fix them.
6 Replace the Servo Drive.
7 Check and match the capacity of
the Servomotor and the Servo
Drive.
8 After the Servo ON, wait for at least
100 ms before inputting an
operation command.
15
Servo Drive overheat
The temperature of the Servo Drive
radiator or power elements exceeded
the specified value.
1 The Servo Drive's ambient
temperature has exceeded the
specified value. Radiation
performance has dropped.
2 There is excessive load.
1 Reduce the Servo Drive's ambient
temperature, and improve the
cooling conditions.
2 Increase the capacity of the Servo-
motor. Reduce the effective load
ratio, for example with a longer
acceleration / deceleration time.
16
Overload
The effective values of the torque
commands have exceeded the over-
load level set by the Overload Detec-
tion Level Setting (Pn072). Operation
is performed with reverse time charac-
teristics.
1 The load is excessive, and the
effective torque has exceeded the
set level and operation has been
performed for a long time.
2 Oscillation, hunching, and vibration
are occurring due to improper gain
adjustment.
3 Servomotor phases are incorrectly
wired and/or are disconnected.
4 The mechanical load is increasing.
There is a problem with the
mechanics.
5 The holding brake is ON.
6 The Servomotor lines are
incorrectly wired between multiple
axes.
Check that the torque (current) wave-
form is not oscillating, and that it is not
fluctuating significantly in the vertical
direction. Check the overload warning
display and the load ratio.
1 Increase the capacity of the Servo
Drive and Servomotor, or reduce
the load. Or increase the
acceleration / deceleration time to
reduce the effective torque.
2 Readjust the gain to stop oscillation
and hunching.
3 Connect the Servomotor lines as
specified in the wiring diagram.
Replace the cables.
4 Check that the mechanics operate
smoothly.
5 Measure the voltage at the brake
terminal. Turn OFF the brake.
Note You cannot reset the warning
for at least 10 seconds after it
occurred.
Alarm
code
Alarm Name
Cause
Countermeasure