Power supply

WARNING

Risk of injury through electric shock and damage to the device!

Bring the Bus Terminals system into a safe, de-energized state before starting mounting, disassembly or wiring of the components!

Supply of Bus Terminal Controller and Bus Terminals (Us)

The Bus Terminal Controller requires a supply voltage of 24 VDC.

The connection is made by means of the upper spring-loaded terminals labelled 24 V and 0 V. This supply voltage is used for the electronic components of the Bus Coupler / Bus Terminal Controllers and (via the K-bus) the electronic components of the Bus Terminals. It is galvanically separated from the field level voltage.

Power supply 1:
Terminal points for the Bus Terminal Controller supply
Power supply 2:
UL identification

CAUTION

Power supply 3:

Note the UL requirements for the power supply.

To comply with the UL requirements, the 24 VDC supply voltage for Us must originate

  • from an isolated source protected by a fuse of max. 4 A (according to UL248) or
  • from a voltage supply complying with NEC class 2.
    An NEC class 2 voltage source must not be connected in series or parallel with another NEC class 2 corresponding voltage source!

CAUTION

Power supply 4:

No unlimited voltage sources!

To comply with the UL requirements, Us must not be connected with unlimited voltage sources.

Power contacts supply (Up)

The bottom six connections with spring-loaded terminals can be used to feed the supply for the peripherals. The spring-loaded terminals are joined in pairs to a power contact. The feed for the power contacts has no connection to the voltage supply for the BC electronics.

The spring-loaded terminals are designed for wires with cross-sections between 0.08 mm2 and 2,5 mm2.

The assignment in pairs and the electrical connection between feed terminal contacts allows the connection wires to be looped through to various terminal points. The current load from the power contact must not exceed 10 A for long periods. The current carrying capacity between two spring-loaded terminals is identical to that of the connecting wires.

Power contacts

On the right hand face of the Bus Terminal Controller there are three spring contacts for the power contact connections. The spring contacts are hidden in slots so that they cannot 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 Terminal Controllers and of the Bus Terminals guarantees that the power contacts mate securely.