HarmonicDrive H A - 800A, Manual

Page: 266 / 314

11-1 Alarms and remedial actions
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Appe
Troubl
esh
oot
ing
Alarm
code
Alarm name Description
Condition at
occurrence
Action
AL86 Communicati
on error
*2
Data could not
be received in
the driver at
least 4
consecutive
times.
－

Defective encoder connector (CN1)
→ Confirm that the encoder connector is
inserted securely.
→ Confirm that the encoder lead lines are
soldered properly.
→ Check the encoder extension connector
for poor contact.

Malfunction due to noise, etc.
→ Confirm that the ground wire is
connected properly.
→ Confirm that the encoder cable is
shielded properly.
→ Confirm that the encoder and motor wires
are not bundled together.
Not lit LED display is
not turned ON
even when the
control power
supply is turned
ON.
The alarm
occurs when the
control circuit
power is turned
on:

The overload protective function in the
driver internal power supply circuit was
activated due to a short period of power
failure, etc.
→ Cut off the control power supply, wait for
about one minute, and reconnect the
power.

Fuse disconnection in the driver
→ Contact our sales office.
*1: This alarm does not occur when an actuator equipped with a 17-bit absolute encoder is combined.
*2: AL80 to AL86: These alarms may occur when an actuator equipped with a 17-bit absolute encoder is
combined. With the 17-bit encoder incremental model, if AL80-AL86 is generated, then after the power is
turned OFF then ON again, if AL80-AL86 is generated again, an abnormality in the 17-bit encoder is
conceivable. Contact our sales office.