T640 Dc Power Supply Electrical Specifications; Table 56: T640 Two-Input 160-A Dc Power Supply Electrical Specifications; Table 57: T640 Three-Input 240-A Dc Power Supply Electrical - Juniper T640 Hardware Manual

T640 Core Router Hardware Guide
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T640 DC Power Supply Electrical Specifications

428
T640 Power System Description on page 60
T640 DC Power Supply Electrical Specifications on page 428
T640 DC Power System Requirements on page 430
Maintaining the T640 Power Supplies on page 194
T640 General Electrical Safety Guidelines and Electrical Codes on page 404
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 56 on page 428 lists the power supply electrical specifications for the two-input
160-A DC power supply.
Table 56: 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:
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 57 on page 428 lists the power supply electrical specifications for the three-input
240-A DC power supply in

Table 57: 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:
–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.
If the input voltage from the DC power source drops below –40.5
mode.
2–INPUT
If the input voltage from the DC power source drops below –37.5 to
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