12-31
12 Troubleshooting and Maintenance
G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
12-4 Troubleshooting
12
12-4-3 Troubleshooting Using the Operation State
The servo locks but the
Servomotor does not
rotate.
The host controller does not
give a command.
For a position command, check
to see if the speed and position
are set to 0.
Enter position and speed data.
Start the Servomotor.
The Servo Drive received a
command but it is not
accepted.
Check to see if the Servo Drive
retains the object value for two
communications cycles or more
in Profile position mode (pp).
Set the Servo Drive so that it
retains the object value for two
communications cycles or
more.
It is hard to determine if the
Servomotor is rotating
Check to see it the speed
command given by the host
controller is too small.
Check the speed command
from the host controller.
The holding brake is
operating.
Check the brake interlock
output (BKIR) signal and the
+24 VDC power supply.
Check to see if the holding
brake on a Servomotor with
brake is released when the
servo is locked.
The torque limits set in the
Positive torque limit value
(60E0 hex) and the
Negative torque limit value
(60E1 hex) are too small.
Check to see if the torque limits
in objects 60E0 hex and
60E1 hex are set to a value
close to 0.
Set the maximum torque to be
used for each of these objects.
The Servo Drive has broken
down.
− Replace the Servo Drive.
The Forward or Reverse
Drive Prohibition Input
(POT or NOT) is OFF.
Check the ON/OFF state of the
POT and NOT signals from the
CX-Drive.
• Turn ON the POT and NOT
signals.
• Disable them in the settings
when the POT and NOT
signals are not used.
The control mode does not
conform to the command.
Check the set value of the
Control Mode Selection
(3001 hex).
Set the control mode according
to the command.
The Servomotor power
cable is wired incorrectly.
Check the wiring. Wire correctly.
The encoder cable is wired
incorrectly.
Power is not supplied. Check the power supply and
the 7-segment display.
Turn ON the power.
Check the voltage between the
power terminals.
Wire the power-ON circuit
correctly.
The Servo Drive has broken
down.
− Replace the Servo Drive.
The Servomotor 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 at the host
controller.
Set the correct data.
The Servomotor power
cable is wired incorrectly.
Check the wiring of the
Servomotor power cable's
phases U, V, and W.
Wire correctly.
The encoder cable is wired
incorrectly.
Check the encoder cable's
wiring.
Wire correctly.
The Servomotor rotates
without a command.
There are inputs of small
values in speed control
mode.
Check if there is an input in
speed control mode.
Set the speed command to 0.
Alternatively, change the mode
to position control mode.
The Servo Drive has broken
down.
− Replace the Servo Drive.
Symptom Probable cause Items to check Measures
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