Siemens 3TK28 User Manual

Description of the individual safety relays
3.6 3TK28 safety relays with relay enabling circuits
3TK28 safety relays
Manual, 07/2016, NEB926157502000/RS-AB/003
105
3.6.9.5
Display of the operating state
The operating state and functioning of the device are indicated by five LEDs:
● POWER
● S 1 ON
● S 2 ON
● CHANNEL 1
● CHANNEL 2
Operating states of 3TK2834
= off
= on
LED
Operation
POWER
S 1 ON
S 2 ON
Channel 1
Channel 2
Button
Not pressed
Only S1 pressed
Only S2 pressed
S1 and S2 pressed
The device cannot start with the following faults:
● Short-circuit, e.g. between the buttons
● Defective relay coils
● Wire break
● Jammed contacts
The output relays do not pick up if
● simultaneity (< 0.5 s) is not achieved
● only one button is pressed
● feedback circuit Y11, Y12 is open.

Siemens 3TK28 Specifications

General

Type	Safety relay
Mounting Type	DIN rail mounting
Type of Voltage	AC/DC
Control Supply Voltage at DC	24 V
Performance Level According to EN ISO 13849-1	PL e
Category According to EN ISO 13849-1	Category 4
Mechanical Durability	10, 000, 000 cycles
Electrical Durability	100, 000 cycles
Protection Class	IP20
Product Function	Safety Monitoring
Suitability for Use	Emergency stop, safety doors
Supply Voltage Frequency	50/60 Hz
Control Supply Voltage at AC at 50 Hz	24 V
Control Supply Voltage at AC at 60 Hz	24 V
Stop Category	0
SIL According to IEC 61508	SILCL 3
Type of Electrical Connection	Screw Connection
Rated Control Supply Voltage	24 V