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Wiring

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ASDA -A3

3

(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

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.

SF1

ON

OF F

SF2

Motor current

ON

Max.10 ms

ON

OF F

EDM

OF F

DO.SRDY(0x01)

ON

Alarm

No alarm

Max.10 ms

OF F

1 s

AL500

AL501

Note: when SF1 becomes OFF, AL501 occurs. When SF2 becomes OFF, AL502 occurs.

3-122

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