Connect DC Power to a PA-220R Firewall

1. Verify that the DC power source that will power the firewall is powered off.
   In the following procedure, connect the DC power cables—and ground cable if you do not use the screw-on ground point—to the DC terminal block before you attach the DC terminal block to the firewall.
2. Connect one end of a 16-22AWG ground cable to the firewall and connect the other end to earth ground. There are three ground locations on the firewall: one screw-on ground point above the DC power inputs and two ground inputs on the DC terminal block (last two inputs to the right of the DC inputs); use only one of the three ground locations even if you will connect a second set of DC power cables for redundancy.
   • Screw-on ground point (Option 1)—Remove the ground screw from the screw-on ground point, hold the 6-32 ring lug (that you previously attached to the ground cable) over the screw hole, and then re-attach the screw to secure the cable to the firewall. Do not torque the screw to more than 6 in-lbs.
   • DC terminal block ground inputs (Option 2)—Insert the cable into one of the two ground input terminals and then secure the cable by turning the flat-head terminal screw clockwise. Do not torque the terminal screws to more than 2 in-lbs.
3. Insert the positive DC cable into terminal A+ and secure the cable by turning the flat-head terminal screw clockwise until tight. Insert the negative cable into terminal A- and secure the cable using the terminal screw. Do not torque the terminal screws to more than 2 in-lbs.
4. (Optional) Repeat step 3 to connect a second DC power source to terminals B+ and B-.
5. Plug the cabled DC terminal block into the DC inputs on the firewall. Secure the terminal block by turning the two screws on each side of the block clockwise and torque to 3 in-lbs.
6. Power on the DC power source to power on the firewall. The firewall powers on and the power (PWR) LED turns green.