User Manual

Gold Bell Installation Guide Installation
MAN-G-BELIG (Ver. 1.004)
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4.8. STO (Safe Torque Off) Inputs
Activation of Safe Torque Off causes the drive to stop providing power that can cause rotation
(or motion in the case of a linear motor) to the motor.
This function may be used to prevent unexpected motor rotation (of brushless DC motors)
without disconnecting the drive from the power supply.
The motor is active only as long as 5 V is provided to both STO1 and STO2. Whenever any input
voltage is no longer present, power is not provided to the motor and the motor shaft continues
to rotate to an uncontrolled stop.
The STO inputs are latched which means that the motor can be re-enabled by a software
command only.
In circumstances where external influences (for example, falling of suspended loads) are
present, additional measures such as mechanical brakes are necessary to prevent any hazard.
This function corresponds to an uncontrolled stop in accordance with Stop Category 0 of IEC
60204-1.
Note: This function does not protect against electrical shock, and additional measures to
turn the power off are necessary.
The following table defines the behavior of the motor as a function of the state of the STO
inputs:
Signal – STO1 Signal – STO2 Function
Not Active Not Active Motor is disabled
Not Active Active Motor is disabled
Active Not Active Motor is disabled
Active Active Motor can be enabled
Table 12: Motor Behavior According to Safety Inputs
Note : In the Gold Bell, STO1 also latches a software disable condition.
Pin (J1) Signal Function
12 STO1 Safety 1 input
11 STO2 Safety 2 input
10 STO_RET STO return
Table 13: STO Inputs Pin Assignments