Sto (safe torque off) inputs (j1) – ElmoMC Gold Line Digital Servo Drives-Gold Trombone User Manual
Page 49
Gold Trombone Installation Guide (EtherCAT and CAN)
Installation
MAN-G-TROIG-EC (Ver. 1.604)
49
4.8. STO (Safe Torque Off) Inputs (J1)
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.
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 Safety Inputs
Note:
In the Gold Trombone, STO1 also latches a software disable condition.
Pin (J1)
Signal
Function
14
STO1
Safety 1 input (default 24 V)
13
STO2
Safety 2 input (default 24 V)
12
STO_RET
Safety signal return
Table 12: Safety Inputs Pin Assignments
See Figure 14 for the PLC option connection and Figure 15 for the TTL option connection.