3Tk28 Safety Relays With Solid-State Enabling Circuits; 3Tk2840 Safety Relay; Applications; Description Of Function And Connection Information - Siemens 3TK28 Manual

Description of the individual safety relays

3.7 3TK28 safety relays with solid-state enabling circuits

3.7 3TK28 safety relays with solid-state enabling circuits
3.7.1

3TK2840 safety relay

3.7.1.1

Applications

Applications of the 3TK2840 safety relay
You can use the 3TK2840 safety relay in EMERGENCY STOP devices according to
DIN EN / IEC 60947-5-5 and in safety circuits according to DIN EN / IEC 60204-1, e.g. for
movable guards and protective doors. Depending on the external circuitry, a maximum
performance level PL
accordance with IEC 62061 can be achieved.
3.7.1.2

Description of function and connection information

The 3TK2840 safety relay has two solid-state outputs. The operating state and functioning
are indicated by three LEDs.
All internal parts of the circuit are cyclically monitored for faults during operation.
Connect the EMERGENCY STOP button or the position switch to terminals Y11, Y12, and
Y21, Y22. The ON button is connected in series with the NC contacts of the external
actuators (feedback circuit) at terminals Y33, Y34.
The 3TK2840 safety relay and the controlled contractors Q1 and Q2 require the same
ground potential.
Performance level PL
with IEC 62061 is only achieved in conjunction with 2 external actuators with positive-action
feedback contacts.
110
/ Cat. 3 in accordance with DIN EN ISO 13849-1 or SILCL 2 in
d
in accordance with DIN EN ISO 13849-1 or SILCL 2 in accordance
d
Manual, 07/2016, NEB926157502000/RS-AB/003
3TK28 safety relays