YASKAWA E-S Series User Manual

10.1 Alarm and Warning Displays
10.1.3 Troubleshooting Alarms
10-10
A.840:
Encoder Data
Alarm
There is a faulty con-
tact in the connector or
the connector is not
wired correctly for the
encoder.
Check the condition of
the encoder connector.
Reconnect the encoder
connector and check
the encoder wiring.
−
There is a cable dis-
connection or short-
circuit in the encoder.
Or, the cable length or
impedance is outside
the specified values.
Check the condition of
the Encoder Cable.
Use the Encoder Cable
within the specified
specifications.
−
One of the following
has occurred: corro-
sion caused by
improper temperature,
humidity, or gas, a
short-circuit caused by
entry of water drops or
cutting oil, or faulty
contact in connector
caused by vibration.
Check the operating envi-
ronment.
Improve the operating
environmental, and
replace the cable. If the
alarm still occurs,
replace the SERVO-
PACK.
−
A malfunction was
caused by noise.
−
Connect the cables
around the encoder
correctly (e.g., separate
the Encoder Cable from
the Servomotor Power
Cable and ground the
encoder).
−
A failure occurred in
the SERVOPACK.
−
Connect the Servomo-
tor to another SERVO-
PACK, and turn ON the
power supply. If no
alarm occurs, the SER-
VOPACK may be faulty.
Replace the SERVO-
PACK.
−
A failure occurred in
the encoder.
−
Connect the SERVO-
PACK to another Servo-
motor, and turn ON the
power supply. If no
alarm occurs, the
encoder may be faulty.
Replace the Servomo-
tor.
−
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction
Reference
for
Correction

YASKAWA E-S Series Specifications

General

Brand	YASKAWA
Model	E-S Series
Category	Servo Drives
Language	English