National Instruments SCXI-1325 Bedienungsanleitung
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National Instruments™, ni.com™, and SCXI™ are trademarks of National Instruments Corporation. Product and company names are trademarks or
trade names of their respective companies.
321929B-01 ©Copyright 1993, 1999 National Instruments Corp. All rights reserved. November 1999
INSTALLATION GUIDE
SCXI -1325 HIGH-VOLTAGE TERMINAL BLOCK
This guide describes how to install and use the SCXI-1325 high-voltage
terminal block with the SCXI-1124 module.
Introduction
The SCXI-1325 high-voltage terminal block is a shielded board with
26 screw terminals for easy connection to the SCXI-1124 input connector.
One pair of screw terminals connects to the SCXI-1124 chassis ground.
The remaining 24 screw terminals are for signal connection to the
six module output channels.
What You Need to Get Started
To set up and use your SCXI-1325 terminal block, you need the following
items:
❑SCXI-1325 high-voltage terminal block
❑SCXI-1325 High-Voltage Terminal Block Installation Guide
❑SCXI chassis
❑SCXI-1124 module
❑Number 1 and 2 Phillips-head screwdrivers
❑1/8 in. flathead screwdriver
❑Long-nose pliers
❑Wire cutter
❑Wire insulation stripper
™
SCXI-1325 Installation Guide 2 www.ni.com
Conventions
The following conventions are used in this guide:
This icon denotes a note, which alerts you to important information.
This icon denotes a caution, which advises you of precautions to take to
avoid injury, data loss, or a system crash.
italic Italic text denotes variables, emphasis, a cross reference, or an introduction
to a key concept.This font also denotes textthat is a placeholder for a word
or value that you must supply.
monospace Text in this font denotes text or characters that you should enter from the
keyboard, sections of code, programming examples, and syntax examples.
This font is also used for the proper names of disk drives, paths, directories,
programs, subprograms, subroutines, device names, functions, operations,
variables, filenames and extensions, and code excerpts.
Safety Information
Cautions Do not operate the device in an explosive atmosphere or where there may be
flammable gases or fumes.
Keep away from live circuits. Do not remove equipment covers or shields unless you are
trained to do so. If signal wires are connected to the device, hazardous voltages may exist
even when the equipment is turned off. To avoid a shock hazard, do not perform procedures
involving cover or shield removal unless you are qualified to do so and disconnect all field
power prior to removing covers or shields.
Equipment described in this document must be used in an Installation Category II
environment per IEC 664. This category requires local level supply mains-connected
installation.
Do not operate damaged equipment. The safety protection features built into this device
can become impaired if the device becomes damaged in any way. If the device isdamaged,
turn the device off and do not use until service-trained personnel can check its safety. If
necessary, return the device to National Instruments for service and repair to ensure that its
safety is not compromised.
Do not operate this equipment in a manner that contradicts the information specified in this
document. Misuse of this equipment could result in a shock hazard.
Terminals are for use only with equipment that has no accessible live parts.
Do not substitute parts or modify equipment. Because of the danger of introducing
additional hazards, do not install unauthorized parts or modify the device. Return the
©National Instruments Corporation 3 SCXI-1325 Installation Guide
device to National Instruments for service and repair to ensure that its safety features are
not compromised.
When using the device with high common-mode voltages, you must insulate your signal
wires for the highest input voltage. National Instruments is not liable for any damages or
injuries resulting from inadequate signal wire insulation. Use only 26-14 AWG wire with
a voltage rating of 300 V and 60 °C for signals that may come in contact with 250 V.
Whenconnectingordisconnectingsignal lines to the SCXI terminal block screwterminals,
make sure the lines are powered off. Potential differences between the lines and the SCXI
ground create a shock hazard while you connect the lines.
Connections, including power signals to ground and vice versa, that exceed any of the
maximum signal ratings on the SCXI device can create a shock or fire hazard or can
damage any or all of the boards connected to the SCXI chassis, the host computer, and the
SCXI device. National Instruments is not liable for any damages or injuries resulting from
incorrect signal connections.
If high voltages (≥30 Vrms and 42.4 Vpeak or 60 VDC) are present,you must connect a safety
earth ground wire to the terminal block safety ground solder lug, shown in Figure 1. This
complies with safety agency requirements and protects against electric shock when the
terminal block is not connected to the chassis. To connect the safety earth ground to the
safety ground solder lug, run an earth ground wire in the cable from the signal source to
the terminal block. National Instruments is not liable for any damages or injuries resulting
from inadequate safety earth ground connections.
Do not loosen or re-orient the safety ground solder lug hardware when connecting the
safety ground wire; to do so reduces the safety isolation between the high voltage and
safety ground.
Signal Connection
Note Refer to the Safety Information section before removing equipment covers or
connecting or disconnecting any signal wires.
When connecting your signals to the SCXI-1325, follow the labeling on the
SCXI-1325 for the appropriate module, as indicated in Figure 2.
To connect the signal to the terminal block, perform the following steps,
referring to Figures 1 and 2 as necessary:
1. Unscrew the top cover screws and remove the cover.
2. Loosen the strain-relief screws and remove the strain-relief bar.
3. Run the signal wires through the strain-relief opening. You can add
insulation or padding if necessary.
4. Prepare your signal wire by stripping the insulation no more than
7mm.
SCXI-1325 Installation Guide 4 www.ni.com
5. Connect the wires to the screw terminals by inserting the stripped end
of the wire fully into the terminal. No bare wire should extend past the
screw terminal. Exposed wire increases the risk of shorting and
causing a failure.
6. Tighten the screws to a torque of 5–7 in.-lb.
7. Connect safety earth ground to the safety-ground solder lug. Refer to
the Safety Information section for connection information.
8. Reinstall the strain-relief bar and tighten the strain-relief screws.
9. Reinstall the top cover and tighten the top cover screws.
10. Connect the terminal block to the module front connectoras explained
in the Installation section.
Figure 1 shows the SCXI-1325 terminal block parts locator diagram.
Figure 1. SCXI-1325 Parts Locator Diagram
1 Strain-Relief Bar
2 Strain-Relief Screws 3 Safety-Ground
Solder Lug 4 Mating Connector
5 Thumbscrew 6 Top Cover Screws
7 Top Cover
2
7
3
6
4
5
1
Back View Front View
©National Instruments Corporation 5 SCXI-1325 Installation Guide
Figure 2 shows the SCXI-1325 signal connections.
Figure 2. SCXI-1325 Signal Connections
Installation
Toconnecttheterminalblock to the SCXI modulefrontconnector,perform
the following steps:
1. Connect the module front connector to its mating connector on the
terminal block.
2. Tighten the top and bottom thumbscrews on the back of the terminal
block to hold it securely in place.
Cleaning the Terminal Block
Clean the terminal block by brushing off light dust with a soft, nonmetallic
brush. Remove other contaminants with deionized water and a stiff
nonmetallic brush. The unit must be completely dry and free from
contaminants before returning to service.
1 Serial Number
2 Wire Entry Side 3 Assembly Number
4 Product Name
1
2
3
4
SUPPLY
ISINK
VOUT
GND
SUPPLY
ISINK
VOUT
GND
SUPPLY
ISINK
VOUT
GND
SUPPLY
ISINK
VOUT
GND
SUPPLY
ISINK
VOUT
GND
SUPPLY
ISINK
VOUT
GND
SCXI-1325 Installation Guide 6 www.ni.com
Specifications
Common-mode isolation
Channel to channel..........................250 Vrms
Channel to ground ...........................250 Vrms
Environment
Operating temperature............................0 to 50 °C
Storage temperature................................–20 to 70 °C
Relative humidity ...................................5% to 90% noncondensing
Safety
Designed in accordance with IEC 61010-1, UL 3111-1, and CAN/CSA
C22.2 No. 1010.1 for electrical measuring and test equipment.
Approved at altitudes up to 2000 meters.
Installation Category II
Pollution Degree 2
Technical Support Resources
NI Web Support
To provide you with immediate answers and solutions 24 hours a day,
365 days a year, National Instruments maintains extensive online technical
support resources. They are available to you at no cost, are updated daily,
and can be found in the Technical Support section of our Web site at
www.ni.com/support
Worldwide Support
National Instruments has offices located around the globe. Many branch
offices maintain a Web site to provide information on local services. You
can access these Web sites from www.ni.com/worldwide
For telephone support in the United States, dial 512 795 8248. For
telephone support outside the United States, contact your local branch
office:
Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20,
Brazil 011 284 5011, Canada (Calgary) 403 274 9391,
Canada (Ontario) 905 785 0085, Canada (Québec) 514 694 8521,
China 0755 3904939, Denmark 45 76 26 00, Finland 09 725 725 11,
France 01 48 14 24 24, Germany 089 741 31 30, Greece 30 1 42 96 427,
©National Instruments Corporation 7 SCXI-1325 Installation Guide
Hong Kong 2645 3186, India 91805275406, Israel 03 6120092,
Italy 02 413091, Japan 03 5472 2970, Korea 02 596 7456,
Mexico (D.F.) 5 280 7625, Mexico (Monterrey) 8 357 7695,
Netherlands 0348 433466, Norway 32 27 73 00, Poland 48 22 528 94 06,
Portugal 351 1 726 9011, Singapore 2265886, Spain 91 640 0085,
Sweden 08 587 895 00, Switzerland 056 200 51 51,
Taiwan 02 2377 1200, United Kingdom 01635 523545
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