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ASDA-B3 Wiring
3-71
3
3.9.4 How does the STO function work?
The STO function controls the motor current by two individual circuits. It cuts off the power
supply to the motor when needed, after which the motor is free from torque force. When an STO
alarm occurs, determine the alarm type according to the pin status of the feedback monitor
signal (FDBK). The following table details how this function works.
Description of action and feedback status:
Signal
Safety
signal
source
Status of opto-isolator
STO
STO_A
~ / STO_A
ON
ON
OFF
OFF
STO_B
~ / STO_B
ON
OFF
ON
OFF
Servo drive output status
Ready
Torque off
(STO_B lost)
Torque off
(STO_A lost)
Torque off
(STO mode)
Feedback monitor signal
(FDBK status)
Open
Close
Open
Open
Alarm
N/A
AL500
AL501
AL502
Note:
1.
ON = 24V; OFF = 0V.
2.
Open = open circuit; Close = short circuit.
3.
The status of the feedback monitor signal switches immediately based on the safety signal source
changes.
4.
Contact the distributor if AL503 occurs. Refer to Chapter 12 Troubleshooting for more details.
3.9.4.1 Activation status
STO reaction time:
When one of the safety signal source is low, the circuit cuts off the motor current within 20 ms.
Max. 20 ms
ON
OFF
Motor current
STO_A / STO_B
H
L
Содержание ASDA-B3 Series
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