Omron OMNUC G Series

8-9
8-3 Troubleshooting
Troubleshooting
8
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.
18
Regeneration
overload
The regenerative energy exceeded the
capacity of the regeneration resistor.
1 The converter voltage was
increased by regenerative energy
during deceleration due to a large
load inertia. The voltage was
further increased due to insufficient
energy absorption of the
regeneration resistance.
2 Because the Servomotor’s rotation
speed is too high, regenerative
energy cannot be fully absorbed
within the specified deceleration
time.
3 The operating limit of the External
Regeneration Resistor is limited to
10%.
Check the regeneration resistance
load ratio. Continuous regenerative
braking is not acceptable.
1 Check the operation pattern (speed
monitor). Check the regeneration
resistance load ratio and the over-
regeneration warning display.
Increase the capacity of the
Servomotor and the Servo Drive to
slow down the deceleration time.
Use an External Regeneration
Resistor.
2 Check the operation pattern (speed
monitor). Check the regeneration
resistance load ratio and the over-
regeneration warning display.
Increase the capacity of the
Servomotor and the Servo Drive to
slow down the deceleration time.
Lower the Servomotor rotation
speed. Use an External
Regeneration Resistor.
3 Set Pn06C to 2.
21
Encoder
communications error
Communications between the encoder
and the Servo Drive failed for a
specified number of times, thereby
activating the error detection function.
(No response to request from the
Servo Drive.)
Check that the encoder line is properly
connected.
Check that there is no damage to the
encoder due to incorrect connections.
Replace the Servomotor and check
again.
Alarm
code
Alarm Name Cause Countermeasure