Description of the individual safety relays
3.8 3TK28 safety relays with contactor relay enabling circuits
3TK28 safety relays
Manual, 07/2016, NEB926157502000/RS-AB/003
145
Display of the operating state
The operating state and functioning of the device are indicated by three LEDs:
● POWER
● RUN
● FAULT
Operating state of 3TK285
= off
= on
POWER RUN FAULT EMERGENCY
ON Outputs Cause
Not pressed Pressed On Normal operation
Pressed No function Off EMERGENCY STOP
(protective door) pressed
Not pressed Not pressed Contactors opened;
• Fault in electronics
• Change of pin assignment
during operation
• Short-circuit to 24 V
(protective door) not
pressed
⇒ device errors
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