EX Series Redundant Power System Quick Start
See the complete RPS documentation
at http://www.juniper.net/techpubs/ .
To install and configure a Juniper Networks EX Series Redundant Power Supply (RPS),
you need:
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Two mounting brackets and eight mounting screws for rack mounting (provided)
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One RPS cable per switch (one is provided, six is the maximum needed)
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At least one EX-PWR3-930-AC power supply (one provided in a separate box)
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Electrostatic discharge (ESD) grounding strap (not provided)
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Phillips (+) screwdriver, number 1 (not provided)
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Screws to secure the chassis to the rack or cabinet (not provided)
Part 1: Mount the RPS in a Rack
Installing the RPS requires one person to lift the switch and a second person to secure it
to the rack. Mount an RPS on two posts of a 19-in. rack or cabinet by using the mounting
brackets provided with the switch. You can also mount an RPS on four posts of a 19-in.
rack or cabinet by using the separately orderable four-post rack-mount kit. There is no
traditional front and back on an RPS. You can position either the switch connector side or
the power supply side of the RPS at the front of the rack.
Part 2: Install Power Supplies
Install one, two, or three power supplies. Install the first one in the center slot.
1. Remove the cover from an RPS power supply slot---use the center slot first.
NOTE:
RPS will not power up if the center power supply is not installed first.
2. Use the screwdriver to loosen the locking lever screw on the power supply.
3. Push down on the locking lever until it is in its lowest position.
4. Using both hands, slide the power supply into the uncovered power supply slot.
5. Push the locking lever up to its highest position.
6. Using the screwdriver, tighten the locking lever screw.
Each power supply can provide backup power for one switch, with a maximum of three
switches concurrently supported by three power supplies.
Part 3: Connect AC Power to Each Power Supply
1. Squeeze the two sides of the power cord retainer clip and insert the L-shaped ends of
the wire clip into the holes in the bracket on each side of the AC appliance inlet.
2. Insert the coupler end of the power cord into the AC appliance inlet.
3. Push the cord into the slot in the adjustment nut of the power cord retainer. Turn the
nut until it is snug against the base of the coupler and the slot in the nut is turned 90°
from the top of the switch.
4. If the AC power source outlet has a power switch, set it to the OFF (0) position.
5. Plug the power cord into the power source outlet.
6. If the AC power source outlet has a power switch, set it to the ON (|) position.
The RPS powers up as soon as the first power supply is installed in the center slot. Install
up to two additional power supplies with the power on (hot-swap)---be sure to connect a
power cord to each power supply.
Part 4: Connect Each Supported Switch to the RPS
Each configured switch has a priority assigned to it when you connect it to the RPS.
Those priority values determine which switches receive power from the RPS first. Priority
is determined by connector position. By default, looking at the connectors, the leftmost
connector has lowest priority and the rightmost one has highest priority. Position your
switches accordingly. (You can also configure switch priority from switches---see
Optionally Override Default RPS Priority Configuration
on the next page.)
1. Attach the ESD grounding strap to your bare wrist and to the ESD point on the RPS
chassis.
2. If the RPS connector on the switch is covered with a panel, remove the cover panel.
3. Connect the RPS cable to a powered switch.
Locking lever
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Tighten captive screw.
Tighten
adjustment nut.
AC
DC
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