Display Of The Operating State - Siemens 3TK28 Manual

Description of the individual safety relays
3.7 3TK28 safety relays with solid-state enabling circuits
3.7.2.5

Display of the operating state

The operating state and functioning of the device are indicated by three LEDs:
● POWER
● RUN
● FAULT
Operating states of 3TK2841
= off
= on
= flashing
LED
POWER RUN
Sensor circuits open; cross-circuit between sensors; short-circuit of sensors to ground.
1)
Only on circuit variant with "cross-circuit detection"
2)
120
FAULT Line supply
On
Self-test on startup approx. 7 s
Fault in electronics
•
Change of pin assignment during operation
•
Short-circuit to 24 V
•
Supply voltage missing
Operation
EMERGENCY ON
STOP
Not pressed Pressed
Pressed Not pressed
1)
Not pressed Not pressed
Fault
2)
Manual, 07/2016, NEB926157502000/RS-AB/003
Outputs
On
Off
Off
Off
3TK28 safety relays