Instruction d'utilisation National Instruments NI PXI-1042

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NI PXI-1042 POWER SUPPLY SHUTTLE
USER GUIDE
The NI PXI-1042 power supply shuttle is a replacement part for the
PXI-1042 chassis.
Introduction
To minimize downtime caused by a power-supply failure, the PXI-1042
chassis has a modular power supply shuttle. This power supply shuttle
includes the chassis power supply, cooling fans, and fan-control circuitry.
Key features of the power supply shuttle include:
• Universal AC input with automatic voltage and frequency ranging
 Over-current protecti

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What You Need to Get Started ❑ PXI-1042 chassis (the unit being repaired) ❑ PXI-1042 power supply shuttle ❑ Read Me First: Safety and Radio-Frequency Interference ❑ NI PXI-1042 User Manual (provided with the chassis; also available at ni.com/support) ❑ #1 Phillips screwdriver Description Refer to Figure 1 to locate user-accessible components on the power supply shuttle. 1 2 3 4 5 6 7 8 10 9 1 Circuit Breaker 6 Remote Inhibit and Voltage Monitoring Connector 2 Universal AC Inlet 7 PXI_CLK10 IN

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Installation and Maintenance The information in this section is for qualified service personnel only. Read the Read Me First: Safety and Radio-Frequency Interference document included with your kit before using the power supply shuttle. Caution Many components within the PXI-1042 chassis under repair are susceptible to static discharge damage. Service the chassis only in a static-free environment. Observe standard handling precautions for static-sensitive devices while servicing the chassis.

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Configuration The fan-speed selector switch is on the rear panel of the power supply shuttle. Refer to Figure 1 to locate the fan-speed selector. Select HIGH for maximum cooling performance (recommended) or AUTO for quieter operation. When set to AUTO, air-intake temperature determines the fan speed. Connecting Safety Ground Caution The power supply shuttle is designed with a three-position NEMA 5-15 jack that connects the ground line to the chassis ground. To minimize shock hazard, make su

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Efficiency ............................................... 70% typical Power disconnect ................................... The AC power cable provides main power disconnect. The chassis front-panel power switch causes the power supply to provide DC power to the CompactPCI/PXI backplane. DC Output DC current capacity (I ) MP Voltage I (Steady-State Current) MP +3.3 V 20 A +12 V 4 A +5 V 29 A –12 V 2 A Load regulation Voltage Load Regulation +3.3 V <5% +12 V <5% +5 V <5% –12 V <5% Maximum ri

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Over-voltage protection 3.3 V and 5 V...................................Clamped at 20 to 30% above nominal output voltage +12 V and –12 V .............................Clamped at 26 to 29 V difference between +12 and –12 V outputs Power supply shuttle MTTR...................Replacement in under 5 minutes NI PXI-1042 Power Supply Shuttle User Guide 6 ni.com