Electrical installation
Control terminals
Safe torque off
78
EDBCSXS064 EN 4.0
5.3.3.7
Example: Wiring with electromechanical safety switching device "Siemens 3TK2827"
for Performance Level Pl
d
S
tart
Not
-H
a
l
t
/ E
mergenc
y
stop
S
iemens
3
TK
2827
Y
22
Y
21
Y
12
Y
11
58
57
4
8
4
7
1
4
13
Y
10
Y
3
4
Y
33
2
4V
DC
T
1
T
2
2
4
23
A
1
A
2
E
C
SxS/P/
M
/A
QSP
SI
1
X
25
X
6
SI
2
S
2
4
S
0
B
D1
B
D2
B-
B
+
G
ND
D
I
1
H
1
ECSXA035
Fig. 5−13
Example: Wiring with "Siemens 3TK2827" safety switching device
T1 Test key 1
T2 Test key 2
ƒ
The motor is shut down in accordance with stop category 1 of EN 60204 when the
safety function is requested.
ƒ
The delay time of the safety switching device and the quick stop deceleration time
have to be coordinated with the brake closing time.
Description of the function
ƒ
The "Siemens 3TK2827" safety switching device has a two−channel effect on the
controller. In the case of an emergency stop request the two channels (terminals 48
and 58) become deenergised. The safety switching device monitors the diagnostic
output of the controller.
ƒ
If the "safe torque off" safety function is activated, output X6/SO is at HIGH level.
This state is shown to the operator by means of the indicator light H1. Afterwards
switch−on is possible again using the Start pushbutton.
ƒ
At least once a year a manual test has to be carried out to verify the independence
and cutout ability of the two disconnecting paths.
