Delta ASDA-A3 Series User Manual page 1217

Troubleshooting
AL500 STO function is enabled
Trigger condition
and cause
Checking method
14
and corrective action
How to clear the
alarm?
AL501 SF1 lost (signal loss or signal error)
Trigger condition
and cause
Checking method
and corrective action
How to clear the
alarm?
AL502 SF2 lost (signal loss or signal error)
Trigger condition
and cause
Checking method
and corrective action
How to clear the
alarm?
AL503 STO self-diagnostic error
Trigger condition
and cause
Checking method
and corrective action
How to clear the
alarm?
14-70
Safe torque off function (STO) is enabled.
Safe torque off function (STO) is enabled. Check why it is enabled.
Reset by using DI.ARST (Alarm reset), OD 6040h [Bit 7] (Fault reset), or
1.
setting P0.001 to 0.
If not using the STO function, plug the short circuit connector into CN10 or
2.
wire to short-circuit the CN10 STO connector. Follow the instructions in
Chapter 3 for the STO wiring.
Loss of SF1 signal, or SF1 and SF2 signals are not synchronized for more than 1
second.
Make sure the wiring of SF1 is correct.
Cycle power on the servo drive. If the alarm cannot be cleared, keep the servo
drive in the safe state and contact the distributor.
Loss of SF2 signal, or SF1 and SF2 signals are not synchronized for more than 1
second.
Make sure the wiring of SF2 is correct.
Cycle power on the servo drive. If the alarm cannot be cleared, keep the servo
drive in the safe state and contact the distributor.
An error occurs during STO self-diagnosis, which may be caused by an abnormality
in the STO circuit.
N/A
Contact the distributor.
ASDA-A3