Table 39: Four-Input 240-A Dc Power Supply Electrical Specifications - Juniper T640 Hardware Manual

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Copyright © 2010, Juniper Networks, Inc.
Table 38: T640 Three-Input 240-A DC Power Supply Electrical
Specifications (continued)
Item Specification
Input DC current Input 0: 67 A @ –48 VDC (nominal) (3216 W)
rating
Input 1: 67 A @ –48 VDC (nominal) (3216 W)
NOTE: For a T640 router, do not use
power supply.
Table 39 on page 349 lists the power supply electrical specifications for the four-input
240-A DC power supply.

Table 39: Four-Input 240-A DC Power Supply Electrical Specifications

Item
DC input voltage
Input DC current rating
T640 Power System Description on page 49
T640 DC Power System Electrical Specifications on page 347
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
Appendix D: T640 Power Guidelines, Requirements, and Specifications
INPUT 2
Specification
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.
Input 0: 47 A @ –48 VDC (nominal) (2256 W)
Input 1: 44 A @ –48 VDC (nominal) (2112 W)
Input 2: 50 A @ –48 VDC (nominal) (2400 W)
Input 3: 50 A @ –48 VDC (nominal) (2400 W)
on a three-input 240-A DC
349