Juniper Networks J-series Services Router J2320 - Manual (Page 277)

NOTE: Primary overcurrent protection is provided by the building circuit breaker.
This breaker should protect against excess currents, short circuits, and earth faults
in accordance with NEC ANSI/NFPA70.
■ 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
RTN , the negative lead to the terminal labeled
–48 VDC , and the earth ground to the chassis grounding points.
Power Sources for Redundant Power Supplies
If your J6350 Services Router includes an optional redundant DC power supply, make
sure that the two DC power supplies are powered by dedicated power feeds derived
from feed A and feed B. This configuration provides the commonly deployed A/B
feed redundancy for the system. Failure to do so makes the router susceptible to
total power failure if one of the power supplies fails.
DC Power Disconnection Warning
WARNING: Before performing any of the following procedures, ensure that power
is removed from the DC circuit. To ensure that all power is off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit breaker to
the
OFF position, and tape the switch handle of the circuit breaker in the OFF position.
Waarschuwing Voordat u een van de onderstaande procedures uitvoert, dient u te
controleren of de stroom naar het gelijkstroom circuit uitgeschakeld is. Om u ervan
te verzekeren dat alle stroom UIT is geschakeld, kiest u op het schakelbord de
stroomverbreker die het gelijkstroom circuit bedient, draait de stroomverbreker naar
de UIT positie en plakt de schakelaarhendel van de stroomverbreker met plakband
in de UIT positie vast.
Varoitus Varmista, että tasavirtapiirissä ei ole virtaa ennen seuraavien toimenpiteiden
suorittamista. Varmistaaksesi, että virta on KATKAISTU täysin, paikanna tasavirrasta
Safety Guidelines and Warnings ■ 255
Chapter 14: Safety and Regulatory Compliance Information