Fig. 28 Potential Connection Diagram (Example Ek1814) - Beckhoff EK18 Series Documentation

E-bus power supply
The EK18xx units supply the E-bus with max. 1000 mA E-bus current.
Power feed terminals are to be inserted if the added terminals require more current!
Input for power contacts
The connections with spring-loaded terminals can be used for the peripheral supply. The spring-loaded
terminals are linked with a power contact. The feed for the power contacts has no connection to the voltage
supply for the Bus Coupler. The design of the feed permits voltages of up to 24 V. The current load via the
power contacts may not permanently exceed 10 A; the supply line must therefore be protected by a 10 A
fuse (slow-blow).
Power contacts
On the right hand face of the Bus Coupler there are two spring contacts for the power contact connections.
The spring contacts are hidden in slots so that they can not be accidentally touched. By attaching a Bus
Terminal the blade contacts on the left hand side of the Bus Terminal are connected to the spring contacts.
The tongue and groove guides on the top and bottom of the Bus Coupler and of the Bus Terminals
guarantees that the power contacts mate securely.
The current load of the power contacts may not permanently exceed 10 A.
Electrical isolation
The bus couplers operate by means of three independent potential groups. The supply voltage feeds the E-
bus electronics in the bus coupler and the E-bus itself, which are electrically isolated. The supply voltage is
also used to generate the operating voltage for the fieldbus.
Note: All the Bus Terminals are electrically isolated from the E-bus. The E-bus is thus electrically isolated
from everything else.
Fig. 28: Potential connection diagram (example EK1814)
EK18xx
NOTE
Version: 2.2
Mounting and wiring
35