YASKAWA SGM-A3 - Page 410

INSPECTION, MAINTENANCE, AND TROUBLESHOOTING
6.2.1 Troubleshooting Problems with Alarm Display cont.
398
Status When Alarm Occurred
C
At control power ON
Cn-01 Bit 1 = 0
Cn-01 Bit 1 = 1
During servomotor
operation
A
,
B
,
C
A
,
B
,
D
,E
Cause Remedy
A Incorrect absolute encoder wiring (PA, PB,
RESET, SEN signal (for speed control),
etc.)
Check and correct the absolute encoder
wiring.
B Absolute encoder malfunctioned
• When Cn-01 Bit 1 = 0, turn SEN signal OFF
and back ON.
• When Cn-01 Bit 1 = 1, turn Servopack con-
trol power OFF and back ON.
C Circuit board (1PWB) defective Replace Servopack.
D
Error occurred in absolute encoder.
D When Cn-01 Bit 1 = 0, turn SEN signal
OFF and back ON (if servomotor is
rotating, first turn servo OFF).
Another encoder alarm displayed when
SEN signal or power supply turned back
ON.
D When Cn-01 Bit 1 = 1, turn Servopack
control power OFF and back ON.
E Servopack miscounted pulses (positional
displacement) or malfunctioned due to
noise.
• Separate encoder wiring from main wiring
circuits.
• When Cn-01 Bit 1 = 0, turn SEN signal OFF
and back ON (if servomotor is rotating, first
turn servo OFF).
• When Cn-01 Bit 1 = 1, turn Servopack con-
trol power OFF and back ON.
D Display and Outputs
Digital Operator
Di l
d
Alarm Output
g
p
Display and
Alarm
Name
Alarm Code Output
Alarm Output
Al
arm
N
ame
ALO1 ALO2 ALO3
p
A.81
Absolute encoder
back-up error
(only if absolute
encoder is used)
OFF OFF OFF OFF
OFF: Output transistor is OFF
ON: Output transistor is ON
6