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Functional safety technology
Page 53
Product Manual
“Servo drive DIS-2 310/2 FB FS STO“
Version 4.0
6
Functional safety technology
6.1
General, intended use
The DIS-
2 310/2 FB FS STO servo drives support the integrated safety function “Safe Torque Off”
(STO) according to the requirements of the standard EN ISO 13849-1.
Furthermore, the principles for testing “Additional requirements for electrical power drive systems
according to EN 61800-5-
2” have been considered.
Safety indices:
Category / Performance level:
Category 3, Performance level e
PFH value
(probability of dangerous failure per hour):
PFH = 4,45 · 10
-8
/h
Note
The indicated values are only reached under the following condition:
Regular testing of the STO function by a superordinated control system (at least once a
week), if such process-related testing is not provided anyway, and test at every switch-on
of the machine / system (see the note in
section 6.2.2
The machine stop must be initiated and ensured by the control system of the machine. This applies
particularly to vertical axes without a self-locking mechanism or weight compensation. Vertical axes
require further safety measures.
Following a hazard analysis/risk assessment in accordance with the machinery directive 2006/42/EC,
the machine manufacturer must plan the safety system for the entire machine whilst taking into
account all of the integrated components. This also includes the electric drives. The requirements that
must be fulfilled by the control system, i.e. the performance level that must be selected, depend on the
actual risk.
The "Safe Torque Off (STO)" function is not the same as an electrical isolation. As a result, it cannot
protect against an electric shock. This is why, in the sense of the standard, an EMERGENCY-OFF
device cannot be realised with the "Safe Torque Off (STO)" function, since an EMERGENCY OFF
requires the disconnection of the entire system from the mains power supply via the mains power
disconnection system (main switch or mains contactor).