Display Of The Operating State - Siemens 3TK28 Manual

3.6.7.5

Display of the operating state

The operating state and functioning of the device are indicated by five LEDs:
● POWER
● CHANNEL 1
● CHANNEL 2
● CH 1 (t)
● CH 2 (t)
Operating states of 3TK2827/28
= off
= on
LED
POWER Ch 1
Ch1 = Channel 1
Ch2 = Channel 2
FK1 = enabling circuit 1, instantaneous
FK2 = enabling circuit 2, instantaneous
FK1 (t) = enabling circuit 1, time-delayed
FK2 (t) = enabling circuit 2, time-delayed
3TK28 safety relays
Manual, 07/2016, NEB926157502000/RS-AB/003
Ch 2 Ch 1 (t) Ch 2 (t)
Description of the individual safety relays
3.6 3TK28 safety relays with relay enabling circuits
Line EMERGENCY
supply STOP
On Not pressed
Pressed, delay
time running
Pressed
Not pressed
Relay welded
•
Motor contactor welded
•
Fault in electronics
•
Short-circuit in ON circuit
•
Cross-circuit in EMERGENCY STOP circuit (minimum fault
current I = 0.5 A;
Kmin
PTC fuse responds) or supply voltage missing
Operation
ON Enabling circuit
Pressed Closed
Not pressed FK1 & FK2 open,
FK1 (t) & FK2 (t)
closed
Not pressed Open
Not pressed Open
Fault
Open
85