cyber
®
simco
®
drive 2 operating manual
Revision: 02
5022-D057946
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10 STO safety function instructions
The STO safety function (
S
afe
T
orque
O
ff) is used for safe torque shutdown and to reliably
protect drives from restarting. The drive amplifier is fitted with a two-channel STO function
as standard in the basic model.
Advantages of the STO safety function:
Intermediate circuit and main circuit can remain active
No contact wear because only control voltages are switched on and off
Less wiring required
Single-channel or two-channel control possible
SIL 2 or SIL 3 systems possible
The STO safety function equates to stop category 0 (uncontrolled stoppage) defined by
EN 60204-1. The STO safety function of the server amplifier can be triggered by external
safety relays or by an external safety control with safe outputs.
The circuit design has been tested and subsequently assessed by TÜV. According to that
assessment, the circuit design used for the
“Safe Torque Off” safety function in the simco
drive series of drive amplifiers is suitable for meeting the requirements for SIL 3 in
accordance with EN 61508 and category 4 PLe in accordance with EN ISO 13849-1:2015.
10.1 Installation space
A drive amplifier in protection class IP20 design should be installed in a space that will ensure
reliable operation of the drive amplifier. The installation space must meet the requirements
of protection class IP54 at least.
10.2 STO wiring
In the case of single-channel control, if the wiring for the STO signals is situated outside a
control cabinet, it must be routed in a permanent installation and protected from external
damage (e.g. by means of a cable duct or hard conduit). Observe all instructions on
connections in the standard DIN EN13849-2 table D.4 to exclude any faults. Further
instructions for wiring can be found in the standard DIN EN 60204-1.
10.3 Important information for STO
If the STO function is actuated during operation, the drive will coast
to a stop in an uncontrolled manner and the drive amplifier reports
the
“Error_amp_sto_active” fault. Controlled braking of the drive
will not be possible.
If an application requires controlled braking before the use of STO,
the drive must first be braked under control and then the STO
function must be triggered with a time delay.
Danger from short-term limited movements when STO function
is activated.
Simultaneous breakdown of two power transistors in the output stage
can cause short-term movement up to 180° / pole pair number of the
motor.
Make sure that a limited movement of this kind cannot cause any
damage.
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