I have noticed a couple of installs where the technician connecting the Jack Fuse Power Port 8FR has made extra work for themselves by either interfacing a VDC fire trip locally with a separate relay or alternatively I have found one or two situations where the DC power supply voltage has been separately wired back through a FIP N/C dry contact then back to the fire trip (FT) inputs on the PP8FR.
The main design principal of the Power Port modules is to simplify the fire trip interface. The above connections are made on board the PP8FR and DO NOT need to be made separately. All common forms of fire trip signal are able to be connected directly to the FT- and FT+ terminals. The installer needs only to choose appropriate link settings, see the diagram below.
The whole idea is to eliminate the mess of relays, terminal block and interconnecting wires that traditionally make up a fire trip interface.
12 or 24VDC fire trips and N/C (going open in alarm) signals can be connected directly to the PP8FR. The only other signal you may come across is an N/O fire signal. The PP8FR can not correctly use a N/O signal, this is deliberate as a N/O signal can not be made fail safe.