Omron OMNUC G User Manual page 393

Alarm
Alarm Name
code
14 Overcurrent
15 Servo Drive overheat
16 Overload
Cause
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.
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.
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.
8-3 Troubleshooting
Countermeasure
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.
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.
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.
8
8-8