Siemens 3TK28 - Display of the Operating State

Description of the individual safety relays
3.7 3TK28 safety relays with solid-state enabling circuits
3TK28 safety relays
112 Manual, 07/2016, NEB926157502000/RS-AB/003
3.7.1.5
Display of the operating state
The operating state and functioning of the device are indicated by three LEDs:
● POWER
● RUN
● FAULT
Operating states of 3TK2840
= off
= on
LED
Operation
POWER RUN FAULT Line supply EMERGENCY
STOP
ON Outputs
On Not pressed Pressed On
Pressed
Not pressed
Off
Not pressed
Not pressed
Off
Fault
• Fault in electronics
• Cross-circuit in EMERGENCY STOP circuits
Off
Supply voltage missing