YASKAWA Sigma-V Series User Manual page 263

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
(Alarm Description)
A.810:
Encoder Backup Error
(Only when an absolute
encoder is connected.)
(Detected on the encoder
side.)
A.820:
Encoder Checksum
Error
(Detected on the encoder
side.)
A.830:
Absolute Encoder
Battery Error
(The absolute encoder
battery voltage is lower
than the specified value.)
A.840:
Encoder Data Error
(Detected on the encoder
side.)
A.850:
Encoder Overspeed
(Detected when the con-
trol power supply was
turned ON.)
(Detected on the encoder
side.)
8-14
Cause
Alarm occurred when the power
to the absolute encoder was ini-
tially turned ON.
The encoder cable disconnected,
and connected again.
The power from both the control
power supply (+5 V) from the
multi-winding drive unit and the
battery power supply is not being
supplied.
An absolute encoder fault
occurred.
A fault occurred in the multi-
winding drive unit.
An encoder fault occurred.
A fault occurred in the multi-
winding drive unit.
The battery connection is incor-
rect.
The battery voltage is lower than
the specified value 2.7 V.
A fault occurred in the multi-
winding drive unit.
An encoder malfunctioned.
Malfunction of encoder because
of noise interference, etc.
The servomotor speed is higher
-1
than 200 min when the control
power supply was turned ON.
An encoder fault occurred.
A fault occurred in the multi-
winding drive unit.
Investigative Actions
Check to see if the power was
turned ON initially.
Check to see if the power was
turned ON initially.
Check the encoder connector bat-
tery or the connector contact status.
−
−
−
−
Check the battery connection.
Measure the battery voltage.
−
−
−
Check the motor rotating speed
(Un000) to confirm the servomotor
speed when the power is turned ON.
−
−
(cont'd)
Corrective Actions
Set up the encoder (Fn008).
Confirm the connection and set up
the encoder (Fn008).
Replace the battery or take similar
measures to supply power to the
encoder, and set up the encoder
(Fn008).
If the alarm cannot be reset by set-
ting up the encoder again, replace
the servomotor.
The multi-winding drive unit may
be faulty. Replace the multi-wind-
ing drive unit.
• Absolute encoder
Set up the encoder again using
Fn008. If the alarm still occurs,
the servomotor may be faulty.
Replace the servomotor.
• Absolute encoder that shows val-
ues for a single rotation or incre-
mental encoder
The servomotor may be faulty.
Replace the servomotor.
The multi-winding drive unit may
be faulty. Replace the multi-wind-
ing drive unit.
Reconnect the battery.
Replace the battery.
The multi-winding drive unit may
be faulty. Replace the multi-wind-
ing drive unit.
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Correct the wiring around the
encoder by separating the encoder
cable from the servomotor main cir-
cuit cable or by checking the
grounding and other wiring.
Reduce the servomotor speed to a
-1
value less than 200 min , and turn
ON the control power supply.
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.