Dc Power Disconnection Warning - Juniper QFX Series Manual

QFX3000 Hardware Documentation
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DC Power Disconnection Warning

198
The marked input voltage of –48 VDC for a DC-powered device 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 device 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 device grounding points.
General Safety Guidelines and Warnings on page 161
General Electrical Safety Guidelines and Warnings on page 191
DC Power Disconnection Warning on page 198
DC Power Grounding Requirements and Warning on page 200
DC Power Wiring Sequence Warning on page 201
DC Power Wiring Terminations Warning on page 202
Connecting DC Power to an EX2200 Switch
Connecting DC Power to an EX3200 Switch
Connecting DC Power to an EX4200 Switch
Connecting DC Power to an EX4500 Switch
Connecting DC Power to an EX6200 Switch
Connecting DC Power to an EX8200 Switch
Connecting DC Power to an XRE200 External Routing Engine
Connecting DC Power to a QFX3500 Device on page 267
This topic applies to hardware devices in the EX Series product family, which includes
switches and the XRE200 External Routing Engine.
This topic also applies to hardware devices in the QFX Series.
WARNING: Before performing any of the DC power 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 device 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.
Copyright © 2012, Juniper Networks, Inc.