PXIe-1085 Modular Power Supply Getting Started

Introduction

The PXIe-1085 modular power supply is a replacement part for the PXIe-1085 chassis.

Caution This power supply is not compatible with any other National Instruments chassis.

Unpacking

  1. Carefully inspect the shipping container and the power supply for damage.
  2. Check for visible damage to the metal work. Check to make sure all handles, hardware, and connectors are undamaged.
  3. Visually inspect the inside of the power supply for any possible damage, debris, or detached components.
If damage appears to have been caused during shipment, file a claim with the carrier. Retain the packing material for possible inspection and/or reshipment.

What You Need to Get Started

  • PXIe-1085 chassis (the unit being repaired)
  • PXIe-1085 power supply
  • Read Me First: Safety and Electromagnetic Compatibility
  • PXIe-1085 User Manual
  • #2 Phillips screwdriver

Installation

The information in this section is for qualified service personnel only. Read the Read Me First: Safety and Electromagnetic Compatibility document included with your kit before using the power supply.

Caution Many components within the 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. Always wear a grounded wrist strap, or equivalent, while servicing the chassis.
Caution Always disconnect the AC power cable before cleaning or servicing the chassis.
Caution Never connect the AC power cable to the power supply until you install it in a chassis. Do not use, test, or configure the power supply outside of a chassis.

The power supply is a replacement part for the PXIe-1085 chassis. The PXIe-1085 Series User Manual contains all of the most up-to-date chassis service procedures, including removal and replacement of power supplies

Removing the Power Supply

Before attempting to replace the power supply, verify that there is adequate clearance behind the chassis.
  1. Disconnect the power cable from the power supply on the back of the chassis.
  2. Identify the eight mounting screws for the PXIe-1085 that attach the power supply to the chassis.
  3. Using a Phillips screwdriver, remove the screws.
  4. Pull on the two rear handles of the power supply to remove it from the back of the chassis, as shown in Figure 1.
    About halfway through removing the shuttle, the rail safety catches engage to prevent the power supply from falling out.
    Figure 1. Removing the Power Supply

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    1. Power Supply Mounting Screws (8x)
    2. Power Supply
    3. Modular Power Supply Screws (4x)
    4. PXIe-1085 chassis
    5. Rail Safety Catch (Both Sides)
  5. Press down on the rail safety catches to remove the power supply the rest of the way, as shown in Figure 1.
    After removing the supply from the chassis, you can access the modular power supply.

Removing the Modular Power Supply

  1. Loosen the four screws that retaining the modular power supply. Refer to the figure above for the screw locations.
  2. Remove the modular power supply by rotating the handle away from the fans and pulling upward when it is in the upright position, as shown in the following figure.
    Figure 2. Removing Modular Power Supply from Power Supply

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    1. Power Supply
    2. Modular Power Supply Handle
    3. Modular Power Supply

Installing the Power Supply

  1. Ensure that there is no visible damage to the new power supply assembly.
  2. Verify that the housing and connector on the new power supply assembly have no foreign material inside.
  3. Install the new power supply assembly into the opening in the power supply in the reverse order of removal.
  4. Replace and tighten the four screws with a Phillips screwdriver.
  5. After installing the power supply assembly, slide the power supply into the opening in the rear of the chassis.
  6. Tighten the eight screws with a Phillips screwdriver.

Configuring the Power Supply

The power supply has two switches: the fan-speed selector switch and the Inhibitor Mode switch.
  1. Set the fan-speed selector switch, located on the rear panel of the power supply, to High or Auto.
    OptionDescription
    High (recommended) Maximum cooling performance
    Auto Quieter performance
  2. Set the Inhibit Mode switch to the Default position.

Connecting Safety Ground

Caution The PXIe-1085 chassis are designed with a three-position NEMA 5-15 style plug for the U.S. that connects the ground line to the chassis ground. To minimize shock hazard, make sure the electrical power outlet you use to power the chassis has an appropriate earth safety ground.
If your power outlet does not have an appropriate ground connection, you must connect the premise safety ground to the chassis grounding screw located on the rear panel. To connect the safety ground, complete the following steps.
  1. Connect a 16 AWG (1.3 mm) wire to the chassis grounding screw using a grounding lug. The wire must have green insulation with a yellow stripe or must be noninsulated (bare).
  2. Attach the opposite end of the wire to permanent earth ground using toothed washers or a toothed lug.

Connecting to Power Source

Caution Do not install modules prior to performing the following power-on test.
To completely remove power, you must disconnect the AC power cable.
  1. Attach input power through the rear AC inlet using the appropriate AC power cable supplied.
  2. Set the Inhibit Mode switch on the back of the chassis to the Manual position.
    The Inhibit Mode switch allows you to power on the chassis or place it in standby mode.
  3. Observe that all fans become operational and all three front panel LEDs are a steady green.
Switching the Inhibit Mode switch to the Default position allows the system controller to control the power supply.