Mounting and wiring
BC3150
19
Version: 2.1.0
3.2.2
Power supply
DANGER
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 V
DC
.
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.
Fig. 8: Terminal points for the Bus Terminal Controller supply
Fig. 9: UL identification
DANGER
Note the UL requirements for the power supply.
To comply with the UL requirements, the 24 V
DC
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!
