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11-29
11-4 Troubleshooting
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
11
Error and Maintenance
The Servomotor does not
rotate in the Servo lock
state.
The host controller does not
give a command.
If it is the position command,
check that the speed and
position are not set to 0.
Enter a position and
speed data.
Start up the Servomotor.
The torque command value
is too small, while the host
controller commands the
torque control.
Check the control mode set by
the host controller and the
given torque command.
Change the setting of
control mode by the host
controller to position.
Check for the servo lock.
Hard to determine that the
motor rotates.
Check that the speed
command given by the host
controller is not too small.
Check the speed
command from the host
controller.
The holding brake works.
Check the brake interlock
output (BKIR) signal and the
+24 VDC power supply.
Check that the holding
brake on a Servomotor
with brake is released by
Servo lock.
The torque limits on No.1
Torque Limit (Pn013) and
the No.2 Torque Limit
(Pn522) are too small.
Check that the torque limits on
Pn013 and Pn522 are not set
to a value close to 0.
Set the maximum torque
to be used for each of
these parameters.
In torque control mode, the
Speed Limit Value Setting
(Pn321) is set to 0.
Check the value set on the
Pn321.
Set a larger value on the
Pn321.
The Servo Drive breaks
down.
Replace the Servo Drive
with a new one.
The Forward or Reverse
Drive Prohibition (POT or
NOT) signal is OFF.
Check the ON-OFF status of
POT and NOT signals in the
monitor mode.
• Turn on the POT and
NOT signals.
• Set to disable, when
the POT and NOT
signals are not used.
The control mode does not
conform with the command.
Check the value set on the
Control Mode Selection
(Pn001).
Set the Pn001 in
accordance with the
command.
The motor power cable is
wired incorrectly.
Check the wiring.
Wire correctly.
The encoder cable is wired
incorrectly.
The power is not supplied.
Check the power supply and
the 7-segment LED state.
Turn on the power.
Check the voltage between
the power terminals.
Wire the power-on
circuits correctly.
The Servo Drive breaks
down.
Replace the Servo Drive
with a new one.
The motor operates
momentarily, but then it
does not operate after
that.
The position commands
given are too little.
Check the position data and
the electronic gear ratio on the
host controller.
Set the correct data.
The motor power cable is
wired incorrectly.
Check the wiring of the motor
power cable's phases U, V,
and W.
Wire correctly.
The encoder cable is wired
incorrectly.
Check the encoder cable's
wiring.
Wire correctly.
Symptom
Probable cause
Items to check
Measures