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Functional safety technology
Page 55
Product Manual
“Servo drive DIS-2 310/2 FB FS STO“
Version 4.0
6.2.2
Description of the STO safety function
Use the "Safe Torque Off" (STO) function if you need to disconnect the motor safely from the energy
supply for your application.
The "Safe Torque Off" function disconnects the driver supply for the power semiconductors and the
PMW signals, thereby preventing the power output stage from supplying the voltage that is required by
1
Safety circuit (switch, relay, safety circuit)
2
Disconnection paths 1 and 2 (control inputs STO1 and STO2)
3
Power output stage
4
Supply for the output stage drivers
5
PWM signal block
6
Feedback contact
Figure 6:
Mode of operation in the case of the DIS-2 310/2 FB FS STO
When the "Safe Torque Off" (STO) function is active, the energy supply to the drive is interrupted in a
safe manner. The drive cannot generate any torque and, thereby, neither any dangerous movements.
In the case of suspended loads or other external forces, additional measures must be taken in order to
prevent them from sagging (e.g. mechanical holding brakes). In the "Safe Torque Off" (STO) state, the
standstill position will not be monitored.
The machine must be stopped in a safe manner, e.g. via a safety switching device. This applies
particularly to vertical axes without a self-locking mechanism, arresting device, or weight
compensation.
The "Safe Torque Off" (STO) function requires a configuration with two channels, i.e. a restart must be
safely prevented via two, completely independent, separate channels. These two channels for
interrupting the energy supply to the drive with the safe pulse inhibitor are called disconnection paths:
floating
feedback contact
driver supply feedback
PWM signal feedback
1
st
disconnection path
PWM signal block
2
nd
disconnection path
deactivation of the driver supply
adjustable linear
15 V controller
with enable pin
linear controller 5V
Output stage
driver
Output stage
driver
PWM driver
inverting
power module
driver IC