B&R X20cSC2212 Manual page 12

X20(c)SC2212
7.1.2 Using external GND without GND from connection element
24 V
SELV
GND
Fault sequence:
• Fault ① (defective protective component):
A component connected to GND on the output short circuits or behaves like an ohmic resistor. This fault
is not always detected.
• Fault ② (open circuit on module GND):
The module loses its direct connection to GND and current begins to flow through the defective protective
component → I
OUT
As a result, current above the maximum value permitted by the module is supplied to the actuator.
Danger!
This type of installation can cause hazardous situations and is therefore NOT permitted.
12
2
Figure 4: External GND only
→ actuator.
Type B output
Logic
IOUT
Protection
1
IGND
Data sheet V1.141 X20(c)SC2212 Translation of the original documentation
Actuator
SOx
GND