11-12
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Error and Maintenance
21
Encoder
communications error
Occurs during operation.
• The encoder is
disconnected.
• Connector contacts
are faulty.
• Fix the locations that
are disconnected.
• Wire correctly.
• The encoder is wired
incorrectly.
• Wire correctly.
• The encoder is damaged. • Replace the motor.
• The driver is faulty.
• Replace the driver.
• The motor is
mechanically held.
• If the motor shaft is
held, release it.
23
Encoder
communications data
error
Occurs when the power
supply is turned ON.
Or, occurs during
operation.
• The encoder signal line
is wired incorrectly.
• Wire correctly.
• Noise on the encoder wiring
causes incorrect operation.
• Take measures against
noise on the encoder wiring.
• The encoder power
supply voltage has
dropped (especially
when the cable is long.)
• Provide the required
encoder power supply
voltage (5 VDC
±
5%).
24
Error counter overflow
Occurs when the motor
does not rotate even when
command pulses are
input.
• The motor power line or the
encoder wiring is incorrect.
• Wire correctly.
• The motor is
mechanically held.
• If the motor shaft is
held, release it.
• Release the
electromagnetic brake.
• Control PCB error
• Replace the driver.
Occurs during high-speed
rotation.
• The motor power line
or the encoder wiring is
incorrect.
• Wire correctly.
Occurs when a long string
of command pulses is
given.
• Gain adjustment is
insufficient.
• Adjust the gain.
• The acceleration/
deceleration is too rapid.
• Extend the acceleration/
deceleration times.
• The load is too large.
• Reduce the load.
• Select a suitable motor.
Occurs during operation.
• The set value for the
Error Counter Overflow
Level (Pn014) is
exceeded.
• Increase the set value
of Pn014.
• Reduce the rotation speed.
• Reduce the load.
• Extend the acceleration/
deceleration times.
25
Excessive hybrid
deviation error
Occurs for full closing
control.
• There is deviation
between the load
position according to
the external scale and
the motor position
according to the
encoder.
• Check the motor and
load connection.
• Check the external scale
and driver connection.
• Check the external scale
load position and encoder
motor position settings.
Alarm
display
Error conditions
Status when error
occurs
Cause
Measures