Description of the individual safety relays
3.6 3TK28 safety relays with relay enabling circuits
3TK28 safety relays
64
Manual, 07/2016, NEB926157502000/RS-AB/003
3.6.5
3TK2824-.A.20 safety relay
3.6.5.1
Applications
Applications of 3TK2824-.A.20 safety relay
You can use the 3TK2824-.A.20 safety relay in EMERGENCY STOP devices according to
DIN EN ISO 60947-5-5 and in safety circuits according to DIN EN IEC 60204-1, e.g. for
movable guards and protective doors. With the device, a maximum performance level
PL
c
/Cat. 1 in accordance with DIN EN ISO 13849-1 or SILCL 1 in accordance with
DIN EN/IEC 62061 can be achieved. Depending on the hazard assessment, additional
measures may be necessary in the sensor circuit (e.g. protected cable installation). When
the safety relay is used in "automatic start" mode, automatic restart (acc. to
DIN EN IEC 60204-1, Sections 9.2.5.4.2 and 10.8.3) after shutdown in an emergency
(EMERGENCY STOP) must be prevented by the higher-level control.
Table 3- 2
Achievable SIL CL/PL as an evaluation unit
1-channel
2-channel
SILCL (in accordance with IEC 62061)
1
1
PL (DIN EN ISO 13849)
c
c
Cat. (DIN EN ISO 13849)
1
1
3.6.5.2
Description of function and connection information
The 3TK2824 safety relay has two enabling circuits (safe circuits) as NO circuits. The
number of enabling circuits can be increased by adding one or more 3TK2830 expansion
blocks. The operating state and functioning are indicated by three LEDs.
When the EMERGENCY STOP buttons or limit switches are released and the ON button is
pressed, the internal circuit of the safety relay and the external contactors are monitored to
ensure that they are functioning correctly.
Connect the EMERGENCY STOP button or the limit switch to terminals Y11, Y12 and Y21,
Y22. The ON button is connected in series with the NC contacts of the external contactors
(feedback circuit) at terminals Y33, Y34.
Содержание 3TK28
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