•
A DC-powered device is equipped with a DC terminal block that is rated for the power requirements of
a maximally configured device.
NOTE:
To supply sufficient power, terminate the DC input wiring on a facility DC source that is
capable of supplying:
•
Minimum of 60 A at –48 VDC for MX10008 routers
Incorporate an easily accessible disconnect device into the facility wiring. Be sure to connect the ground
wire or conduit to a solid office earth ground. A closed loop ring is recommended for terminating the
ground conductor at the ground stud.
•
Run two wires from the circuit breaker box to a source of 48 VDC.
•
A DC-powered device that is equipped with a DC terminal block is intended only for installation in a
restricted-access location. In the United States, a restricted-access area is one in accordance with Articles
110-16, 110-17, and 110-18 of the National Electrical Code ANSI/NFPA 70.
NOTE:
Primary overcurrent protection is provided by the building circuit breaker. This breaker
must protect against excess currents, short circuits, and earth grounding faults in accordance
with NEC ANSI/NFPA 70.
•
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 device and
the supply side of the DC wiring.
•
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.
347
Summary of Contents for MX10008
Page 1: ...MX10008 Universal Routing Platform Hardware Guide Published 2019 11 11 ...
Page 19: ......
Page 89: ......
Page 129: ......
Page 170: ......
Page 278: ...5 CHAPTER Troubleshooting Hardware Restoring Junos OS 283 Alarm Messages 287 ...
Page 279: ......
Page 287: ......
Page 318: ...Restricted Access Warning 321 ...
Page 333: ...Jewelry Removal Warning 336 ...
Page 336: ...Operating Temperature Warning 339 ...
Page 345: ...DC Power Disconnection Warning 348 ...
Page 349: ...DC Power Wiring Sequence Warning 352 ...
Page 352: ...DC Power Wiring Terminations Warning 355 ...
Page 361: ...Translation The emitted sound pressure is below 92 dB A per GR63 CORE 364 ...