How Does The Sto Function Work; Response Time - Delta ASDA-A3 Series User Manual

Wiring

3.11.5 How does the STO function work?

The STO function controls the motor current by two individual circuits. When the STO function is
3
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
Servo drive output status
Diagnostic output (EDM)
Note:
AL500 is triggered only when P1.120 is set to 1 or 3.
1.
ON = 24V; OFF = 0V.
2.
Open = open circuit; Close = closed circuit.
3.
The status of the EDM signals changes at once according to the status of the safety signals (SF1 and
4.
SF2 signals).

3.11.5.1 Response time

When either SF1 signal or SF2 signal becomes OFF, the circuit cuts off the current to the motor
within 10 ms.
3-126
Signal
SF1+
ON
SF1-
SF2+
ON
SF2-
Ready
Open
Alarm N/A
Status of opto-isolator
ON OFF
OFF ON
Torque off Torque off
(SF2 lost) (SF1 lost)
Open Open
AL502 AL501
ASDA-A3
OFF
OFF
Torque off
(STO activated)
Close
AL500