PSM-DC4
l Environmental Specifications
l MTBF Hours for HDEquipment
l Power
l Slot Numbers and Assignments — SH4R
l Slot Numbers and Assignments — SH4R-2
l SH4R Shelf
l SH4R-2 Shelf
Features
l Is field replaceable and hot-swappable
l Supplies the required power to the shelf in a load-sharing mode
l Continually monitors input and output voltage, current, and alarm generation to
determine if threshold levels are exceeded
l Is equipped with a hiccup mode that turns off a PSM-DC4 if a short circuit on the 12 V
distribution is detected
l Power
l SH4R Shelf
l SH4R-2 Shelf
Specifications
Power cable See DC Power Cable Specifications
Nominal/rated input voltage –48 VDC
Operating input voltage –39.5 to –75 VDC
Nominal/rated input current 18.1 A at –48 VDC
Maximum input current 22.2 A at –40 VDC
Inrush current Less than 5.7 A
Power consumption Typical:47 W
Maximum:80 W
Typical efficiency 94%
Maximum output power 800 W
Nominal output voltage 12.2 VDC
Maximum output current 67 A
Recommended external circuit
breaker
l –48 VDC: 42 to 45 A
l –60 VDC: 33 to 45 A
Recommended external fuse
l –48 VDC: 45 A
l –60 VDC: 35 A
Minimum hold-up time Not supported
Table 48: Electrical Specifications — PSM-DC4
FSP 3000R7 High-Density Subshelf Guide - R17.2 - Issue:B 110
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