Juniper JRR200, Hardware Manual

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Connecting Power to a DC-Powered JRR200 Route Reflector
Before you begin connecting DC power to a JRR200 Route Reflector:
•
Ensure that you have taken the necessary precautions to prevent electrostatic discharge
(ESD) damage.
• Ensure that you have connected the chassis to earth ground.
CAUTION: Before you connect power to the JRR200 route reflector, a
licensed electrician must attach a cable lug to the grounding cable that
you supply. A cable with an incorrectly attached lug can damage the device
(for example, by causing a short circuit).
To meet safety and electromagnetic interference (EMI) requirements and
to ensure proper operation, you must properly ground the JRR200 route
reflector chassis before connecting power.
•
Check that the power supplies are fully inserted into the chassis.
Ensure that you have the following parts and tools available:
•
DC power source cables (14–16 AWG) with ring lug
• Phillips (+) screwdriver, number 2
• Multimeter
To connect DC power:
WARNING: Before performing the following procedure, ensure that there is
no power in the DC circuit. To ensure that all power is cut off, locate the circuit
breaker on the panel board that services the DC circuit, switch the circuit
breaker to the off (0) position, and tape the switch handle of the circuit
breaker in the off position.
1.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to the ESD point on the rear of the chassis.
2.
Ensure that the voltage across the DC power source cable leads is 0 V and that the
cable leads do not become active while you are connecting DC power.
3.
Verify that the DC power cables are correctly labeled before making connections to
the power supply. In a typical power distribution scheme where the return is connected
to chassis ground at the battery plant, you can use a multimeter to verify the resistance
of the -48V and RTN DC cables to chassis ground.
•
The cable with very high resistance (indicating an open circuit) to chassis ground
is negative (–) and will be installed on the
V–
(input) DC power input terminal.
Copyright © 2018, Juniper Networks, Inc. 46
JRR200 Route Reflector Hardware Guide