15
Figure 3 below details the wiring for terminal blocks in Figure 2, items 3 through 10.
Figure 3: Connection details for terminal blocks
Power Input
AC power input for the NAC is provided via the two unpolarised AC terminals.
Power is typically provisioned from the transformer fitted to the enclosure in
which the NAC is installed.
The NAC AC voltage requirements are specified in Specifications.
The enclosure installation manual provides further details for the transformer,
along with fuse location and specifications.
Notice! Transformers supplied by Carrier Fire & Security have internal thermal
fuses. Shorting the AC leads together may blow the thermal fuse before the
replaceable fuse can react, rendering the unit inoperative.
Notice! In case of a worn, pinched or otherwise damaged transformer lead, the
transformer must be replaced in order to avoid hazard.
The transformer leads supply high currents to the board. Poor connections lead
to excessive voltage drop and can affect system performance.
At the board connection, the installer must ensure that:
a) Terminal wiring is performed with the transformer power input disconnected.
b) The bare wire ends are neatly dressed and fully inserted into the terminal
housing. Less than 2mm of exposed wire should be visible after termination.
To Next Page
Loading...
