National Instruments PXI Series Bedienungsanleitung

INSTALLATION GUIDE

PXI and PXI Express Chassis Fan

Replacement

This guide describes how to replace the fan on a PXI and PXI Express

chassis.

Cautions Make sure to unplug the power cord before replacing the fan.

Only trained service personnel should replace the fan.

4–6 and 9 Slot Chassis Fan Replacement

Note Fan replacement is supported only on chassis with specific assembly numbers. The

supported model numbers are listed below, followed by their supported assembly numbers

in parentheses. The xdenotes the assembly letter revision.

Before replacing the fan, be sure to check the model and assembly numbers on the back of

your PXI chassis. Replace the fan only if the model and assembly numbers are on the

following list. Refer to the NI PXI-103x and NI PXIe-1073 Chassis Fan Replacement

section for information about previous revisions.

• NI PXI-1031 (190871x-01, Revision L and newer)

• NI PXI-1031DC (191746x-01, Revision H and newer)

• NI PXI-1033 (194918x-01, Revision E and newer)

• NI PXI-1036 (192592x-01, Revision H and newer)

• NI PXI-1036DC (192593x-01, Revision F and newer)

• NI PXIe-1071 (195659x-01L)

• NI PXIe-1073 (196695x-01, Revision D and newer)

• NI PXIe-1078 (199485x-01L)

Refer to Figure 1 and the following steps for installation and removal

instructions.

Chassis Fan Replacement Guide 2 ni.com

NI PXI-103xand NI PXIe-1073 Chassis Fan Replacement

This section describes how to install the NI PXI-103xchassis fan

replacement kit for the PXI-1031, PXI-1031DC, PXI-1033, PXI-1036,

PXI-1036DC, and PXIe-1073 chassis.

Note Fan replacement is supported only on chassis with specific assembly numbers. The

supported model numbers are listed below, followed by their supported assembly numbers

in parentheses. The xdenotes the assembly letter revision.

Before replacing the fan, be sure to check the model and assembly numbers on the back of

your PXI chassis. Replace the fan only if the model and assembly numbers are on the

following list.

• NI PXI-1031 (190871x-01, Revision H through K)

• NI PXI-1031DC (191746x-01, Revision E through G)

• NI PXI-1033 (194918x-01, Revision A through D)

• NI PXI-1036 (192592x-01, Revision D through G)

• NI PXI-1036DC (192593x-01, Revision C through E)

• NI PXIe-1073 (196695x-01, Revision A through C)

Refer to Figure 5 and the following steps for installation and removal

instructions.

©National Instruments Corporation 3 Chassis Fan Replacement Guide

Figure 1 shows the parts you must remove to access the fan. Refer to the

following steps for installation and removal instructions.

Figure 1. PXI Express Chassis Part Locations (Chassis Shown Upside Down)

Complete the following steps to replace the fan (refer to the previous figure

for parts locations):

1. Locate the fan access panel on the bottom of the chassis. Remove the

access panel screw and the access panel.

2. Remove the two fan shoulder screws, shown in Figure 1, that fasten the

fan. Be careful not to lose the screws.

3. Remove the fan.

1 Fan Shoulder Screw (x2)

2 Fan Access Panel Screw (x1)

3 Fan Access Panel

4Fan

5 Screen (Visible Through Fan)

6 Chassis

Chassis Fan Replacement Guide 4 ni.com

4. Disconnect the fan cable from the inline connector. The connector is

shown in Figure 2.

Figure 2. Fan Cable Inline Connector

1Fan 2 Fan Cable Inline Connector

©National Instruments Corporation 5 Chassis Fan Replacement Guide

5. Connect the new fan to the inline connector. Place the fan inside the fan

bracket with the square slot oriented as shown in Figure 3. The air flow

direction is into the chassis, so the plastic grill and label on the fan

should face toward the PXI card cage.

Place the screen below the fan (see Figure 1 for screen location).

Ensure that the loose screen doesn’t fall out. If the screen does fall out,

return it to its position under the fan.

Figure 3. Square Slot on Fan Housing

6. Reinstall the two shoulder screws.

1 Square Slot on Fan Housing

AIR FLOW

Chassis Fan Replacement Guide 6 ni.com

Figure 4. Thermistor Wire

7. Tighten the shoulder screws to between 3.0 lb · in. minimum torque

and 3.6 lb · in. maximum torque.

Caution Orient the thermistor wire, as shown in Figure 4, before replacing the fan access

panel.

8. Place the fan access panel over the opening. Insert and tighten the

access panel screw to between 3.0 lb · in. minimum torque and

3.6 lb · in. maximum torque.

Caution Reorient the chassis to an upright position and ensure there are no loose parts

prior to plugging in the power cord.

1 Thermistor wire

©National Instruments Corporation 7 Chassis Fan Replacement Guide

Figure 5 shows the parts you must remove to access the fan. Refer to the

following steps for installation and removal instructions.

Figure 5. PXI and PXI Express Chassis Part Locations (Chassis Shown Upside Down)

1 Washers (x3 each)

2 Fan Screw (x4)

3 Fan Access Panel Screw

4 Fan Access Panel

5 Thermistor

6 Thermistor Clip

7 Fan Guard Screen

8 Fan Guard

Chassis Fan Replacement Guide 8 ni.com

Complete the following steps to replace the fan (refer to the previous figure

for parts locations):

1. Locate the fan access panel on the bottom of the chassis. Remove the

access panel screw and the access panel.

2. Remove the four fan screws, shown in Figure 5, that fasten the fan. Be

careful not to lose the screws or washers. (If you lose a screw, replace

it with an M3 ×0.5 ×35 mm pan head Phillips screw.)

3. Remove the thermistor and fan guards.

4. Remove the fan.

5. Disconnect the fan cable from the inline connector protruding through

the grommet in the fan bracket. The connector is shown in Figure 6.

Caution Do not allow the wires to fall through the grommet.

Figure 6. Fan Cable Inline Connector

1 Grommet 2 Fan Cable Inline Connector

©National Instruments Corporation 9 Chassis Fan Replacement Guide

6. Connect the new fan to the inline connector. Place the fan inside the fan

bracket with the square slot oriented as shown in Figure 7. The fan

flow direction is into the chassis, so the plastic grill on the fan should

face toward the PXI card cage.

Figure 7. Square Slot on Fan Housing

7. Place the fan guards on top of the fan with the round wire guard closest

to the fan and the screen guard on top of the round wire guard.

1 Square Slot on Fan Housing

Chassis Fan Replacement Guide 10 ni.com

8. Insert three of the four screws with the flat washers closest to the fan

and the split spring washers closest to the screw heads. The fourth

screw does not use washers, but instead anchors the thermistor. Insert

the fourth screw through the thermistor clip hole and orient the

thermistor as shown in Figure 8.

Figure 8. Thermistor Location and Orientation

9. Tighten the screws to between 5.7 lb · in. minimum torque and

6.7 lb · in. maximum torque.

10. Place the fan access panel over the opening. Insert and tighten the

access panel screw to between 3.0 lb · in. minimum torque and

3.6 lb · in. maximum torque.

Caution Reorient the chassis to an upright position and ensure there are no loose parts

prior to plugging in the power cord.

1 Grommet 2 Thermistor and Clip

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