YASKAWA S Series User Manual page 276

Alarm Code
(Alarm/warning History)
"DO" No feedback pulse after mov-
O v e r f l o w i n g
Overflow during high-speed
running
Normal running by overflow
with large move reference
input
"71"
Lit during driving
Operation resumes after
Instantaneous overload
turning power OFF and ON.
"72" Lit during operation
Operation resumes after
Continuous overload
turning power OFF and ON.
"80" At control power supply ON
Absolute encoder error
(only if an absolute
encoder is used)
During Servomotor driving
Status When Lit
Servomotor wiring incorrect.
reference input
Encoder wiring incorrect.
Control board (1PWB) defective.
Servomotor wiring incorrect.
Encoder wiring incorrect.
User constant setting incorrect.
Control board (IPWB) defective.
SERVOPACK adjustment incorrect. Increase speed loop gain
Load capacity too large.
Feed speed too large.
Load greatly exceeds the rated torque
from several seconds to tens second.
Load greatly exceeds the rated torque
from ten seconds to hundreds
second.
Faulty absolute encoder wiring (PA,
PB, PC).
Absolute encoder malfunction.
Control board (1PWB) defective.
Absolute encoder error occurred.
SERVOPACK miscounted pulses
(incorrect position) or malfunctioned
due to noise.
Number of encoder pulses set incor-
rectly.
12 -7
Cause
• Check and correct Servo-
motor wiring.
• Check to see if the Phase-A,
-B and -C pulses are correct
at 2CN, and repair (discon-
nection, short, no power
supply, defective circuit
board.) if necessary.
Replace SERVOPACK.
• Check and correct Servo-
motor wiring.
• Check to see if the Phase-A,
-B and -C pulses are correct
at 2CN, and repair (discon-
nection, short, no power
supply, defective circuit
board.) if necessary.
Set the correct user constant.
Replace SERVOPACK.
(Cn-0004).
Review the load. (overload or
load inertia)
Decrease the feed speed.
Review the load. (overload)
Review the load. (overload)
Check absolute encoder con-
nections.
Send the SENS_OFF com-
mand and resend the
SENS_ON command.
Replace SERVOPACK.
Send the SENS_OFF com-
mand and resend the
SENS_ON command.
Separate encoder wiring from
main circuits, transfer the
SENS_OFF command (servo
OFF if driving) and resend the
SENS_ON command.
Reset the correct number of en-
coder pulses.
12.2 Troubleshooting
Remedy