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Functional safety technology
Page 54
Product Manual
“Servo drive DIS-2 310/2 FB FS STO“
Version 4.0
For stopping, the standard EN 60204-1 describes three stop categories that can be used based on a
risk analysis.
Table 25:
Stop categories
Stop category 0
Uncontrolled stop by an immediate
removal of power.
EMERGENCY OFF or
EMERGENCY STOP
Stop category 1
Controlled stop and removal of power
supply when the machine has come to a
standstill.
EMERGENCY STOP
Stop category 2
Controlled stop without the removal of
power when the machine is at a standstill.
Not suitable for EMERGENCY OFF
or EMERGENCY STOP
6.2
Integrated "Safe Torque Off (STO)" function
DANGER!
The "Safe Torque Off" function does
not
protect against electric shock! It only protects
against dangerous rotary movements!
6.2.1
General information concerning the STO function
Performance characteristics:
Realisation of the "Safe Torque Off" (STO) function
Floating feedback contact for the operating status and diagnosis
The STO function is integrated in the basic device
The "Safe Stop 1" (SS1) function can be realised with a suitable external safety switching device
and a suitable wiring of the DIS-2 310/2 FB FS STO basic device.
There are three suitable measures for realising the "STO" function:
Contactor between the mains power supply and drive system (mains contactor)
Contactor between the power unit and drive motor (motor contactor)
Safe pulse inhibitor (blocking of the pulses of the power semiconductors, integrated in the DIS-2
310/2 FB FS STO)
The integrated solution (safe pulse inhibitor) offers several advantages:
fewer external components, e.g. contactors
reduced wiring and space required in the control cabinet
and, thereby, lower costs.
Another advantage is the availability of the system. In the case of the integrated solution, the
intermediate circuit of the servo drive can remain charged. As a result, there are no significant waiting
times when the system is restarted.