Omron SMARTSTEP 2 SERIES User Manual page 299

Alarm
Error
code
18 Regeneration
overload
21 Encoder
disconnection
detected
Status when error
occurs
• Load inertia is too large.
Occurs when the Ser-
vomotor is decelerat-
ing.
• The deceleration time is
too short.
• The Servomotor rotation
speed is too high.
• The operating limit of the
External Regeneration
Resistor is limited to
10%.
• Gravitational torque is
Occurs during descent
(vertical axis). too large.
• The operating limit of the
External Regeneration
Resistor is limited to
10%.
• The encoder is discon-
Occurs during opera-
tion. nected.
• Connector contacts are
faulty.
• The encoder wiring is in-
correct.
• The encoder is dam-
aged.
• The Servo Drive is faulty.
• The Servomotor is me-
chanically being held.
8-3 Troubleshooting
Cause Countermeasure
• Calculate the regenera-
tive energy, and connect
an External Regenera-
tion Resistor with the re-
quired regeneration
absorption capacity.
• Extend the deceleration
time.
• Reduce the Servomotor
rotation speed.
• Extend the deceleration
time.
• Calculate the regenera-
tive energy, and connect
an External Regenera-
tion Resistor with the re-
quired regeneration
absorption capacity.
• Set Pn6C to 2.
For details, refer to Param-
eter Details on page 5-32.
• Add a counterbalance to
the machine to lower
gravitational torque.
• Slow the descent speed.
• Calculate the regenera-
tive energy, and connect
an External Regenera-
tion Resistor with the re-
quired regeneration
absorption capacity.
• Set Pn6C to 2.
For details, refer to Param-
eter Details on page 5-32.
• Fix the locations that are
disconnected.
• Correct the wiring.
• Correct the wiring.
• Replace the Servomotor.
• Replace the Servo Drive.
• If the Servomotor shaft is
being held by external
force, release it.
8
8-8