104
(3) Cold-start level alarms
Code Error
name
Cause/Action
B8 Pole sense error
This controller will conduct excitation phase detection when the servo is
first turned ON after the power was input. This alarm indicates that the
specified encoder signal level cannot be detected after 100 ms of
excitation.
Cause: (1) Loose or disconnected motor-relay cable connector
(2) Brake cannot be released on a controller equipped with
brake.
(3) Large motor load due to application of external force
(4) Power was input when the actuator was contacting a
mechanical end.
(5) Large slide resistance of the actuator itself
Action: (1) Check the wiring condition of the motor relay cable.
(2) Check the wiring condition of the brake cable, and also turn
on/off the brake release switch to see if the brake makes
“click” sounds.
(3) Check for abnormality in the assembly condition of
mechanical parts.
(4) Move the actuator away from the mechanical end and then
reconnect the power.
(5) If the load is normal, cut off the power and move the
actuator by hand to check the slide resistance.
If the actuator is suspected to be the cause, please contact IAI.
D8 Deviation overflow
The position deviation counter has overflowed.
Cause: (1) The speed dropped during movement due to the effect of
an external force, etc.
(2) The pole sense detection operation after power on is
unstable.
Action: (1) Check the load conditions—such as whether the load is
contacting a surrounding object or the brake is
disengaged—and then correct the abnormality, if any
(2) An overload condition is suspected, so review the load
weight. Reconnect the power and then execute home
return.
E8 Phase-A/B
disconnection
detection
E9 Phase-A
disconnection
detection
EA Phase-B
disconnection
detection
The encoder cable is disconnected.
Cause: (1) Loose or disconnected encoder-relay cable connector
(2) Disconnected cable on the actuator end
Action: Check the connection condition of the encoder relay cable and
conduct continuity check. If the results are normal, please
contact IAI.
F8 Damaged
nonvolatile
memory
Abnormal data was detected during the nonvolatile memory check after
starting.
Cause: (1) Faulty nonvolatile memory
(2) The memory has been rewritten more than 100,000 times.
(The nominal rewrite limit of the nonvolatile memory is
around 100,000 times.)
Action: If the alarm generates again after reconnecting the power,
please contact IAI.
FA CPU error
The CPU is not operating properly.
Cause: (1) Faulty CPU
(2) Malfunction due to noise
Action: If the alarm generates again after reconnecting the power,
please contact IAI.