Juniper QFX10016 Hardware Manual page 226

QFX10016 Switch Hardware Guide
202
to chassis ground at the battery plant, you can use a multimeter to verify the resistance
of the and DC cables to chassis ground:
–48V RTN
The cable with very high resistance (indicating an open circuit) to chassis ground
is negative (–) and will be installed on the
The cable with very low resistance (indicating a closed circuit) to chassis ground is
positive (+) and will be installed on the
CAUTION: You must ensure that power connections maintain the proper
polarity. The power source cables might be labeled
their polarity. There is no standard color coding for DC power cables.
Install each power cable lug on the DC power input terminal, securing it with the nut
10.
(see Figure 103 on page
of torque to each nut. (Use the 13/32 in. [10 mm] nut driver or socket wrench.)
a. Secure each positive
input terminal.
b. Secure each negative
input terminal.
Each power supply has two independent sets of DC power input terminals (
: and
RTN –48V/–60V INPUT 2: : RTN –48V/–60V
supply must be powered by dedicated power feeds derived from feed
feed INPUT 2 . This configuration provides the commonly deployed INPUT 1 / INPUT
2 feed redundancy for the switch.
–48V
(return) DC power input terminal.
RTN
203). Apply between 24 in.-lb (2.7 Nm) and 25 in.-lb (2.8 Nm)
DC source power cable lug to the
(+)
(–) DC source power cable lug to the
). For feed redundancy, each power
(input) DC power input terminal.
and to indicate
(+) (–)
(return) DC power
RTN
–48V (input) DC power
INPUT 1:
INPUT 1
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