National Instruments PXI-1042HVDC User manual

INSTALLATION GUIDE
NI PXI-1042HVDC DC Cable Kit
The PXI-1042HVDC DC cable is designed to connect the PXI-1042HVDC
chassis to a DC power source. The cable consists of a DC power connector,
18 feet of 10 AWG cable, and a high heat, impact resistant, water tight fuse
holder with a 20 A fuse installed. For maximum DC power source
protection, the fuse is located as close to the DC power source as is
practical.
The user must install the appropriate connectors required to connect the
cable to their DC power source.
Caution Observe proper polarity when connecting to a DC power source. Refer to
drawing CD_192057-01 for more detail.
Fuse Replacement
Caution Disconnect the cable from the PXI-1042HVDC chassis and any power source
before replacing the fuse or connecting the fuse holder to the DC cable.
Complete the following steps to replace the fuse:
1. Unscrew the two halves of the fuse holder body by turning one half in
a counter-clockwise direction.
2. Replace the fuse with an F20A, 500 VDC/600 VAC, 1.5 in. ×.41 in.
(10 mm ×38 mm) Midget, fast-acting fuse.
3. Align the mating tabs on one half of the fuse holder body with the slots
on the other half, and screw the two halves back together in a clockwise
direction. Hand tighten only.
Reducing Cable Length
National Instruments recommends using the cable at its designed length. If
it is necessary to shorten the cable for a particular application, the following
guidelines should be observed.
Caution Do not leave the fuse holder out of the cable assembly.

National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation.
Product and company names mentioned herein are trademarks or trade names of their respective
companies. For patents covering National Instruments products, refer to the appropriate location:
Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.
© 2004 National Instruments Corp. All rights reserved. 371359A-01 Oct04
Complete the following steps to remove the fuse holder from the cable:
1. Carefully remove the heat-shrink tubing from both sides of the fuse
assembly. Take care not to damage the cable insulation underneath the
heat-shrink tubing.
2. Slide back the insulating boot on the load side of the cable only.
3. Loosen the set screw on the load side of the fuse holder and remove the
fuse holder assembly with the line side cable attached.
4. Remove the load side insulating boot from the red cable.
Complete the following steps to prepare the cable for fuse holder
re-installation:
1. Cut the cable to the desired length.
2. Cut an additional 18 inches of red cable only.
3. Separate the positive (red) and negative (black) leads for 4 inches.
4. Strip 1/2 inch of insulation from the red cable. Refer to
drawing CD_192057-01 for more detail.
Complete the following steps to re-install the fuse holder:
1. If heat shrink tubing will be used in step 5 below, slide the tubing onto
the load side of the cable.
2. Re-install the load side insulating boot onto the red cable.
3. Install the fuse holder assembly onto the red cable. Tighten the set
screw to 35 in-lbs.
4. Slide the insulating boot onto the fuse holder assembly.
5. Install heat shrink tubing, electrical tape, or tie-wraps on both sides of
the cable next to the fuse holder assembly insulating boots.
Cautions If the PXI-1042HVDC DC cable is shortened in a manner inconsistent with
these instructions or specifications listed by NI, the protective features of the cable may be
impaired.
Do not lengthen the cable as an unacceptable voltage drop may occur. This may damage
the power supply, or prevent chassis operation.
For maximum DC power source protection, keep the fuse holder as close to the power
source as possible.