Description of the individual safety relays
3.8 3TK28 safety relays with contactor relay enabling circuits
3TK28 safety relays
158
Manual, 07/2016, NEB926157502000/RS-AB/003
3.8.3
3TK2853 safety relay
3.8.3.1
Applications
Applications of the 3TK2853 safety combination
You can use the 3TK2853 safety combination 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 and contactless protective equipment. Depending on
the external circuitry, a maximum performance level PL
e
/ Cat. 4 in accordance with
DIN EN ISO 13849-1 or SILCL 3 in accordance with IEC 62061 can be achieved.
3.8.3.2
Description of function and connection information
The 3TK2853 solid-state safety combination has two contactor relays as switching elements,
one safe solid-state output, one safe input for cascading and one input for functional
switching.
The operating state and functioning are indicated by three LEDs.
On startup, the device runs a self-test in which the internal electronics are checked for
correct functioning.
All internal parts of the circuit are cyclically monitored for faults during operation.
With safe output 2, expansion units, such as 3TK2830/56/57 and external actuators or loads,
can be switched. Also, cascading with units 3TK2841/42/45/53 is possible via safe output 2.
In the case of PL
d/e
or SILCL 2/3, single-channel cascading is only possible within one
cabinet.
Make sure that the actuator/load and the 3TK2853 safety combination have the same
ground potential.
