T640 Dc Power Supply Electrical Specifications; Table 37: T640 Two-Input 160-A Dc Power Supply Electrical Specifications; Table 38: T640 Three-Input 240-A Dc Power Supply Electrical - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide

T640 DC Power Supply Electrical Specifications

348
T640 DC Power System Requirements on page 350
Maintaining the T640 Power Supplies on page 159
General Electrical Safety Guidelines and Electrical Codes for M Series, MX Series, and
T Series Routers on page 324
Use a customer site circuit breaker for each power supply input. We recommend that
you provision a circuit breaker for each DC power supply input rated for at least 125% of
the continuous current that the input draws at –48 VDC, or as required by local code.
Table 37 on page 348 lists the power supply electrical specifications for the two-input
160-A DC power supply.
Table 37: T640 Two-Input 160-A DC Power Supply Electrical
Specifications
Item Specification
DC input voltage Nominal –48 VDC, –60 VDC
Operating range: –40.5 to –72 VDC
NOTE: If the input voltage from the DC power source drops below –40.5
VDC, the router automatically shuts down. During automatic shutdown,
the circuit remains active. When the input voltage returns to –42.75 VDC,
the router automatically starts up again and the system returns to normal
operation within 30 minutes. No operator intervention is required.
Input DC current 68 A @ –48 VDC (nominal) for each input (3264 W)
rating
Table 38 on page 348 lists the power supply electrical specifications for the three-input
240-A DC power supply in

Table 38: T640 Three-Input 240-A DC Power Supply Electrical

Specifications
Item Specification
DC input voltage Nominal –48 VDC, –60 VDC
Operating range: –40.0 to –72.0 VDC
NOTE: If the input voltage from the DC power source drops below –37.5 to
–39.5 VDC, the router automatically shuts down. During automatic shutdown,
the circuit remains active. When the input voltage returns to –43.0 to –44.00
VDC, the router automatically starts up again and the system returns to
normal operation within 30 minutes. No operator intervention is required.
mode.
2–INPUT
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