YASKAWA SGDV-OFB03A Product Manual page 99

Sigma-5 and Sigma-7 Series SERVOPACKs
Alarm Number: Alarm
Name (Alarm Description)
A.830: Encoder Battery
Alarm
A.840:Encoder Data Alarm
A.850: Encoder Overspeed
A.860: Encoder Overheated
A.C80: Encoder Clear Error
or Multiturn Limit Setting
Error
A.C90: Encoder Communi-
cations Error
A.C91: Encoder Communi-
cations Position Data Accel-
eration Rate Error
A.C92: Encoder Communi-
cations Timer Error
| | Feedback Option Module Type 3 - Manual version C - Revision 0 | en |
Cause
The battery voltage was
lower than the specified
level after the control power
supply was turned ON.
An encoder fault occurred
Malfunction of encoder
because of noise interfer-
ence, etc.
Wiring incorrect or one
signal is missing.
Noise
Note: If the scale file is configured for Hall sensor connectivity, a Hall sensor must be con-
nected. Disabling Hall sensor connectivity (Pn080.0 = 1) and trying to work without the
sensor will cause error A.840.
The encoder was operating
at high speed when the
power was turned ON.
The internal temperature of
the encoder is too high.
The multiturn data for the
absolute encoder was not
correctly cleared or set.
The absolute encoder reset
was not completed or not
supported.
Communications between
the encoder and SERVO-
PACK is not possible.
The noise interference
occurred on the input/output
signal line because the
encoder cable is bent and
the sheath is damaged.
The encoder cable is bun-
dled with a high-current line
or near a high-current line.
Noise interference occurred
on the input/output signal
line from the encoder.
Errors in Semi-closed Loop Control with Rotary Motors
Investigative Actions
Measure the battery voltage. Replace the battery.
Turn the power supply OFF
and then ON again.
-
-
-
Check the speed monitor
(Un000) to confirm the ser-
vomotor speed when the
power is turned ON
Measure the ambient oper-
ating temperature around
the servomotor.
Turn the power supply OFF
and then ON again.
Turn the power supply OFF
and then ON again.
Check the encoder con-
nector contact status. Check
the encoder cable.
Check the encoder cable,
the connector and the
encoder cable layout.
Check the operating envi-
ronment.
Error Lists
Corrective Actions
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 circuit
cable or by checking the
grounding and other wiring.
Recheck the wiring.
Connect shield properly as
recommended.
Reduce the servomotor
speed to a value less than
-1
200 min , and turn ON the
control power supply.
The ambient operating tem-
perature of the servomotor
must be 40 °C or less.
If the alarm still occurs, the
servomotor may be faulty.
Replace the servomotor
If the alarm still occurs, the
SERVOPACK may be faulty.
Replace the SERVOPACK.
Re-insert the encoder con-
nector and confirm that the
encoder is correctly wired.
Use the encoder cable with
the specified rating.
Confirm that there is no
problem with the encoder
cable layout.
Confirm that there is no
surge voltage on the
encoder cable.
Take countermeasures
against noise.
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