BK9500 - Bus Coupler for USB

BKxx50 and BKxx51

The Bus Couplers / Bus Terminal Controllers require an operating voltage of 24 VDC. Use a 4 A fuse or a Class 2 power supply to comply with the UL requirements.

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

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Power supply connections for BKxx50 and BKxx51
 ul_label_us
UL identification
 
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DANGER
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. 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!
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DANGER
No unlimited voltage sources!
To comply with the UL requirements, Us must not be connected with unlimited voltage sources.