Delta ASDA-A3 Series User Manual page 209

Wiring
(2) AL501(SF1 lost) / AL502 (SF2 lost) (signal loss or signal error)
When either SF1 signal or SF2 signal becomes OFF, the STO function is activated, the
circuit cuts off the current to the motor within 10 ms, and the servo drive is Off, triggering
3
AL500. After 1 second, AL501 or AL502 is triggered. The following diagram illustrates how
AL501 is triggered.
The panel displays either "AL500" or "-STO-" according to the setting of P1.120.
Note: when SF1 becomes OFF, AL501 occurs. When SF2 becomes OFF, AL502 occurs.
3-128
SF1
SF2
Motor current
EDM
DO.SRDY(0x01)
Alarm No alarm
ON
ON
Max.10 ms
ON
Close
Max.10 ms
ON
AL500
OFF
OFF
OFF
1 s
AL501
ASDA-A3