Connect DC Power to a PA-7080 Firewall
The following procedure describes how to connect power to DC power supplies in a PA-7080 firewall. The power supplies require -40VDC to -60VDC power input. For details on power requirements, see Determine PA-7000 Series Firewall Power Configuration Requirements.
You must connect each of the eight DC power connections (four on each PEM) to separate 60-amp protected circuit breakers, minimum -48VDC, and a double pole on the input to the DC power.
Due to the various DC cable lengths required in your environment, DC power cables are not provided with the PA-7080 DC model.
- Read Product Safety Warnings.
- Put the provided ESD wrist strap on your wrist ensuring that the metal contact is touching your skin. Then attach (snap) one end of the ground cable to the wrist strap and remove the alligator clip from the banana clip on the other end of the ESD grounding cable. Plug the banana clip end into one of the ESD ports located on the front of the chassis before handling ESD sensitive hardware. For details on the ESD port location, see PA-7080 Front Panel (AC).
- Remove the two nuts and star washers from the ground studs located on the back of the chassis on the upper left side.
- Crimp a 6-AWG wire to the grounding lug and connect the other end to your earth ground point.
- Connect the two-post lug connector to the two-post studs on the chassis using the provided star washers and nuts and then torque the nuts to 50 in-lbs. You can install the lug in a vertical or horizontal position. Be careful not to strip the threads on the nuts and lug studs.
- While facing the back of the chassis, remove the plastic covers that protect the DC power connections for PEM A (1 and 2) and PEM B (1 and 2).If you are installing additional DC power supplies on the front of the chassis, remove the plastic covers for the corresponding PEM numbers. For example, to install two additional power supplies, remove the covers over PEM A (3) and PEM B (3).
- Remove the two nuts and star washers from the DC power studs on the PEMs and then remove the power lugs. In this case, you are connecting four power supplies, so remove a total of eight lugs from PEM A (1 and 2) and PEM B (1 and 2).
- Crimp each two‑hole power lug (eight total) to enough 6-AWG wire to reach from the DC lug on the PEM to your DC power source. Connect lugs (not included) designed for your DC power source to the other end of each cable. Use red wire for the positive cables and black wire for negative cables.Do not connect the cables to the live power source at this point.
- Power off your DC power feed.
- Connect a positive cable (red) from your power source to the two-post RTN studs for PEM A 1 and then connect a negative cable (black) from your power source to the two-post studs for PEM A 1 ‑48VDC studs. Do the same for PEM A 2, ensuring that you connect each connection using the correct polarity and that each connection goes to a 60-amp protected circuit breaker.
- Using DC power connected to a different 60-amp protected circuit breaker, connect a positive cable (red) from your power source to the two-post RTN studs for PEM B and then connect a negative cable (black) from your power source to the two-post studs PEM B 1 -48VDC. Do the same for PEM B, ensuring that you connect each connection using the correct polarity. This will connect the four power supplies located at the front of the chassis numbered 1 A and 1 B and 2 A and 2 B.
- Re-attach the plastic covers over the exposed DC power studs and cables.
- Confirm that all front slot cards are properly inserted.
- After each DC cable is securely connected, power on the DC power source and the chassis will power on.
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