Safety Function Sto; Safety Characteristic Data; Enclosure; Wiring - Kollmorgen S700 Instruction Manual

Kollmorgen
5.9

Safety function STO

A frequently required application task is the safe torque off and the protection of person-
nel against unintentioned restarting of drives. The S700 servo amplifier offers, even in the
basic version, a two channel STO function (Safe Torque Off). The function blocks the trig-
ger pulses of the power transistors (pulse inhibitor).
Advantages of the safety function STO:
—
—
—
—
—
The STO safety function corresponds to stop category 0 (uncontrolled stopping) acc. to
EN 60204-1. The safety function STO can be operated from external safety switch gears
(relays), from a safe external control (semiconductor output or driven contact) or from the
built-in safety card S1-2 or S2-2 (see p. 152).
The STO safety concept is certified by the TÜV. The safety circuit concept for realizing
the safety function "Safe Torque Off" in the servo amplifiers S700 is suited for SIL CL3
according to IEC 62061 and PLe according to ISO 13849-1.
SIL2 / PLd solutions can be implemented with single-channel or dual-channel control with
simple safety switching devices.
A SIL3 / PLe solution requires a safety control that periodically tests the safe switching of
the pulse inhibitor by analyzing the feedback signal.
5.9.1

Safety characteristic data

The subsystems (servo amplifiers) are totally described for safety technics with the
characteristic data SIL CL, PFH
Device
STO
STO
STO
5.9.2

Enclosure

Since the servo amplifier meets enclosure IP20, you must select the enclosure ensuring a
safe operation of the servo amplifier referring to the enclosure. The enclosure must meet
IP54 at least.
5.9.3

Wiring

When using STO wiring leads outside the control cabinet, the cables must be laid durably
(firmly), protected from outside damage (e.g. laying in a cable duct), in different sheathed
cables or protected individually by grounding connection.
Wiring remaining within the demanded enclosure must meet the requirements of the stan-
dard IEC 60204-1.
S701x2-S724x2 Instructions Manual
the DC bus link remains charged up, since the mains supply line remains active
only low voltages are switched, so there is no contact wear
very little wiring is required
single or dual channel control possible
SIL2 or SIL3 solutions possible
Operation mode
STO single channel
STO dual channel
STO dual channel +
periodical testing
07/2014
and T .
D M
EN 13849-1 EN 62061
PLd, Cat 3 SIL CL2
PLd, Cat 3 SIL CL2
PLe, Cat 4 SIL CL3
Technical description
PFH [1/h] T [Year]
D M
7.05E-08
7.05E-08
1.04E-09
20
20
20
41