Siemens Sirius 3TK2826 User Manual

3TK2826 safety relay
Manual, 08/2007, GWA NEB 926 1579-02 DS 02
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Configuration / project engineering
9
9.1 General remarks
SIRIUS safety relays and the safety chain
A safety chain generally consists of the Sense, Evaluate and Deactivate functions.
Sensing
This involves sensing a safety requirement, e.g. when an EMERGENCY STOP facility is
actuated or a hazardous area protected by sensors such as light arrays or laser scanners is
entered.
Evaluation
This involves detecting a safety requirement and safely initiating the reaction, e.g. the
undelayed deactivation of the SIRIUS safety relay's enabling circuits.
Deactivation
This involves the reaction in an emergency or under a risk, e.g. by deactivating hazarouds
drives via subsequently connected contactors.
Result
Within this safety chain, SIRIUS safety relays act in the areas of evaluation and deactivation.

Siemens Sirius 3TK2826 Specifications

General

Relay Type	safety relay
Type of voltage	AC/DC
Category acc. to EN ISO 13849-1	Category 4
Rated operational current	6 A
Mechanical durability	10, 000, 000 cycles
Electrical durability	100, 000 cycles
Protection class	IP20
Rated Control Voltage	24 V
Supply voltage	24 V
Stop category	0
SIL claim level safety integrity level acc. to IEC 61508	SIL 3
Performance level (PL) acc. to EN ISO 13849-1	e
Operating temperature range	-25°C to +55°C
Operating Temperature	-25°C to +55°C