3 safe torque off, Safe torque off, Electrical installation – Lenze ECSCAxxx User Manual
Page 80: Stop, Control terminals safe torque off, The circuit for the internal control, The final power stage
Electrical installation
Control terminals
Safe torque off
l
80
EDBCSXA064 EN 3.2
5.3.3
Safe torque off
The axis modules support the "safe torque off" safety function (formerly "safe standstill"),
"protection against unexpected start−up", in accordance with the requirements of
EN ISO 13849−1, Performance Level Pld. For this purpose, the axis modules are equipped
with two independent safety paths. The Performance Level Pld is obtained if the output
signal is additionally checked with regard to correctness at X6/SO.
5.3.3.1
Implementation
In the axis module, the "safe torque off" connection is implemented with optocouplers.
The optocouplers isolate the following areas electrically from each other:
ƒ
The digital inputs and outputs:
– input X6/SI1 (controller enable/inhibit)
– input X6/SI2 (pulse enable/inhibit)
– brake output X6/B+, B−
– output X6/SO ("safe torque off" active/inactive)
ƒ
The circuit for the internal control
ƒ
The final power stage
>1
µP
U
V
W
X
Y
Z
X6
X25
X2
Sl2
Sl1
U
V
W
SO
GND
S24
B+
BD1
B-
BD2
&
&
&
&
&
&
ECSXA100
Fig. 5−11
Implementation of the "safe torque off" function
Area 1:
Inputs and outputs
Area 2:
Circuit for the internal control
Area 3:
Power output stage
(
Stop!
Use insulated wire end ferrules when wiring the "safe torque off" circuits to
X6.