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Wiring

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ASDA -A3

3

3.10.5 How does the STO function work?

The STO function controls the motor current by two individual circuits. When the STO function is

activated, it cuts off the power to the motor, so the motor is free from torque force. The following

table details how this function works.

STO

Signal

SF1+

SF1-

SF2+

SF2-

Servo drive output status

Diagnostic output (EDM)

Alarm

Note:

ON

ON

Ready

OFF

N/A

Status of opto-isolator

ON

OFF

OFF

Torque off

(SF2 lost)

OFF

AL502

ON

Torque off

(SF1 lost)

OFF

AL501

OFF

OFF

Torque off

(STO activated)

ON

AL500

1. AL500 is triggered only when P1.120 is set to 1 or 3.

2. Definition of STO signal status: ON = 24V; OFF = 0V.

3. Definition of EDM signal status: OFF = open (open circuit); ON = close (closed circuit).

4. The status of the EDM signals changes at once according to the status of the safety signals (SF1 and

SF2 signals).

3.10.5.1 Response time

When either SF1 signal or SF2 signal becomes OFF, the circuit cuts off the current to the motor

within 10 ms.

SF1 / SF2

ON

OF F

Motor current

ON

Max.10 ms

OF F

3-120

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