Juniper Networks T1600 Benutzerhandbuch
Connecting a Three-Input 240-A Power Supply
To connect a three-input 240-A power supply to the power sources, follow this
procedure:
procedure:
1.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and
connect the strap to one of the ESD points on the chassis. See “Preventing
Electrostatic Discharge Damage” on page 47.
connect the strap to one of the ESD points on the chassis. See “Preventing
Electrostatic Discharge Damage” on page 47.
2.
Verify that a licensed electrician has attached cable lugs to the power cables that
you supply.
you supply.
3.
Verify that the voltage across the DC power source cables leads is 0 V and that
there is no chance that the cables might become active during installation. If
needed, switch off the external circuit breakers.
there is no chance that the cables might become active during installation. If
needed, switch off the external circuit breakers.
4.
Verify that the circuit breakers on the power supply faceplate are in the
OFF
position (
O
).
5.
Remove the clear plastic cover protecting the terminal studs on the faceplate.
6.
Remove the nut and washer from each power terminal stud.
CAUTION: You must ensure that power connections maintain the proper polarity.
The power source cables might be labeled
The power source cables might be labeled
(+)
and
(–)
to indicate their polarity. There
is no standard color coding for DC power cables. The color coding used by the external
DC power source at your site determines the color coding for the leads on the power
cables that attach to the terminal studs on each power supply.
DC power source at your site determines the color coding for the leads on the power
cables that attach to the terminal studs on each power supply.
7.
Attach the lugs on the DC source power cables to the terminal studs.
a.
Attach the positive (+) DC source power cable lugs to the
RETURN
(return)
terminals.
b.
Attach the negative (–) DC source power cable lugs to the
–48V
(input)
terminals.
Secure the cable lugs to the terminal studs, first with a washer, then with a nut
(see Figure 17 on page 26). Use a 7/16-in. (11-mm) nut driver or wrench to
tighten the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque
to each nut.
(see Figure 17 on page 26). Use a 7/16-in. (11-mm) nut driver or wrench to
tighten the nut. Apply between 23 lb-in. (2.6 Nm) and 25 lb-in. (2.8 Nm) of torque
to each nut.
NOTE: For power supplies set to
3-INPUT
mode (required for the T1600 routing node),
connect two DC power cables to each of the three inputs.
8.
Loosen the captive screw or screws on the cable restraint on the right edge of
the power supply faceplate.
the power supply faceplate.
9.
Route the DC power cables through the cable restraint.
10.
Tighten the cable restraint captive screw or screws to hold the power cables in
place.
place.
Upgrading the DC Power Supplies
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25
Upgrading the DC Power Supplies