Description of the individual safety relays
3.6 3TK28 safety relays with relay enabling circuits
3TK28 safety relays
24
Manual, 07/2016, NEB926157502000/RS-AB/003
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
an
–
flashes green when t
s
elapses
–
green steady light on enabling the output contacts
●
SF
–
flashes on faults in the measurement and feedback circuit and on insufficient auxiliary
voltage U
H
(see flashing code)
LED flashing codes of the red LEDs "SF" in order of priority
