For the DC input circuit, make sure there
is a 60-amp protected circuit breaker, minimum -40VDC to -60VDC,
and a double pole on the input to the DC power. The power cables
used to connect DC power are provided with the PA-7050 firewall,
but not the PA-7080 firewall.
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-7050
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 provided 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. Be careful not to strip the nuts and
Power off your DC power feed.
Connect each of the four DC power supplies to a -48VDC
power source using the provided DC power cables.
Crimp the bare wire ends of the cables using
lugs (not included) designed for your DC power source. Each cable
has two red (positive) and two black (negative) wires. Crimp the
two black wires together and connect to your DC negative terminal
and then crimp the two red wires together and connect to the positive
terminal. Do this for each of the four power supplies, ensuring
that the first two power supplies on the left are connected to one
power circuit breaker and the second pair on the right is connected
to a different circuit breaker. This ensures power redundancy and
allows for planned electrical circuit maintenance.
Connect the other ends of the DC cables to the front
of the DC power supplies by pushing the plastic connector into the
DC power supply until it clicks into place. Ensure that you connect
each pair of power supplies to a different circuit breaker.
When cabling the DC power supply to your power source, ensure
that you route the cable in such a way that it does not put pressure
on the plastic clips located at the front of the DC power supplies.
It is best to route the cables first and then plug the cables into
the power supplies.