© National Instruments Corporation
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Using the Mainframe
Mainframe Description
The VXI-1501 mainframe is designed in full compliance with the VXIbus
specification (Rev. 2.0). The mainframe contains 13 slots for plug-in
modules and can be rack mounted in either the forward or reverse position.
Other features of the VXI-1501 mainframe include the following:
•
Power supply reliability
•
Solid state automatic bus grant sensing to bypass empty slots
(no backplane jumpers required)
•
Variable speed fan cooling
•
Rear mounted 25-pin D connector for auxiliary power supply
monitoring
•
Easy replacement of major components—most can be replaced from
the rear of the mainframe, even while the mainframe is mounted in
a rack
•
Seven standard VXIbus power supply voltages—all overvoltage,
overcurrent, and temperature protected
•
Maximum usable power (total power supply output power before
thermal protection shutdown): 1690 W @ 25 °C, 1690 W @ 40 °C,
1488 W @ 55 °C
Line Voltage and Input Power
The VXI-1501 mainframe includes a power supply that automatically
adjusts for standard nominal line voltages of 100/120 VAC and
220/240 VAC, and nominal power line frequencies of 50 Hz and 60 Hz.
The power supply has a power factor corrected input section and thus can
be powered from any nominal line input within the range of 100 VAC to
240 VAC. The power supply can also be powered from a 400 Hz AC line
frequency or DC power line voltages. Refer to Appendix A,
, for complete input power specifications.
Warning
Refer to the
section in this chapter for complete
grounding information when power line frequencies exceed 66 Hz.
