Sto (safe torque off) inputs (j2) – ElmoMC ExtrIQ Gold Line Servo Drives-Gold Solo Hornet User Manual
Page 43
Gold Solo Hornet Installation Guide (EtherCAT and CAN)
Installation
MAN-G-SOLHORIG-EC (Ver. 1.009)
43
4.8. STO (Safe Torque Off) Inputs (J2)
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 24 VDC (or 5 V for the TTL option) 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 11: Motor Behavior According to STO Inputs
Note:
In the Gold Solo Hornet, STO1 also latches a software disable condition.