Power supply

CAUTION

Power supply 1:

Note the UL requirements for the power supply.

These UL requirements apply to all supply voltages of the BX controller (Us and Up)!

To comply with UL requirements, the BX controllers may only be connected to supply voltages (24 VDC) that originate

    • from an isolated source protected by a fuse of max. 4A (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 voltage source!

    CAUTION

    Power supply 2:

    No unlimited voltage sources!

    In order to comply with UL requirements, the BX controllers must not be connected to unlimited voltage sources!

    Power supply 3:
    Terminal points for the Bus Terminal Controller supply
    Power supply 4:
    UL marking of the BX Controller

    Supply of Bus Terminal Controller and Bus Terminals (Us)

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

    The BX controller is connected via the upper terminal points labelled 24 V and 0 V. This voltage supplies the Bus Terminal Controller electronics, and the Bus Terminal electronics via the K-bus. It is galvanically separated from the field level voltage.

    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 BX electronics. The design of the feed permits voltages of up to 24 V.

    The spring-loaded terminals are designed for wires with cross-sections from 0.08 mm2 to 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.