Juniper MX480 Hardware Manual page 286

MX480 3D Universal Edge Router Hardware Guide
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256
Ensure that the polarity of the DC input wiring is correct. Under certain conditions,
connections with reversed polarity might trip the primary circuit breaker or damage
the equipment.
For personal safety, connect the green and yellow wire to safety (earth) ground at both
the router and the supply side of the DC wiring.
The marked input voltage of –48 VDC for a DC-powered router is the nominal voltage
associated with the battery circuit, and any higher voltages are only to be associated
with float voltages for the charging function.
Because the router is a positive ground system, you must connect the positive lead to
the terminal labeled
RETURN
earth ground to the chassis grounding points.
DC Power Supply Electrical Specifications for the MX480 Router on page 280
Calculating Power Requirements for MX480 Routers on page 269
DC Power Circuit Breaker Requirements for the MX480 Router on page 281
DC Power Cable Specifications for the MX480 Router on page 282
DC Power Electrical Safety Warnings for Juniper Networks Hardware Equipment on
page 256
DC Power Electrical Safety Warnings for Juniper Networks Hardware Equipment
When working with DC-powered equipment, observe the following warnings:
DC Power Copper Conductors Warning on page 256
DC Power Disconnection Warning on page 257
DC Power Wiring Terminations Warning on page 258
DC Power Copper Conductors Warning
WARNING: Use copper conductors only.
Waarschuwing Gebruik alleen koperen geleiders.
Varoitus Käytä vain kuparijohtimia.
Attention Utilisez uniquement des conducteurs en cuivre.
Warnung Verwenden Sie ausschließlich Kupferleiter.
Avvertenza Usate unicamente dei conduttori di rame.
Advarsel Bruk bare kobberledninger.
Aviso Utilize apenas fios condutores de cobre.
¡Atención! Emplee sólo conductores de cobre.
, the negative lead to the terminal labeled
Copyright © 2011, Juniper Networks, Inc.
, and the
–48V