Display Of The Operating State - Siemens 3TK28 Manual

Description of the individual safety relays
3.6 3TK28 safety relays with relay enabling circuits
3.6.1.5

Display of the operating state

The operating state and functioning of the device are indicated by three LEDs:
● DEVICE
– lights up green during operation
– lights up red on internal device faults
● OUT
– lights up yellow on EMF > U
– flashes green when t
– green steady light on enabling the output contacts
● SF
– flashes on faults in the measurement and feedback circuit and on insufficient auxiliary
LED flashing codes of the red LEDs "SF" in order of priority
24
elapses
s
voltage U (see flashing code)
H
an
Manual, 07/2016, NEB926157502000/RS-AB/003
3TK28 safety relays