background image

CVI™, LabVIEW™, and National Instruments™, ni.com™, NI-DAQ™, and SCXI™ are trademarks of National Instruments Corporation. Product and 
company names are trademarks or trade names of their respective companies.

321925B-01

©

 Copyright 1993, 1999 National Instruments Corp. All rights reserved.

November 1999

INSTALLATION GUIDE

SCXI -1322 H

IGH

-V

OLTAGE

 T

ERMINAL

 B

LOCK

This guide describes how to use and install the SCXI-1322 terminal block 
with the SCXI-1122 module.

Introduction

The SCXI-1322 terminal block consists of a shielded board with 48 screw 
terminals for easy connection to the SCXI-1122 input connector. Sixteen 
pairs of screw terminals connect to the SCXI-1122 module inputs. The 
remaining seven pairs of screw terminals are for the module excitation 
channels.

What You Need to Get Started

To set up and use your SCXI-1322 terminal block, you need the following 
items:

SCXI-1322 terminal block

SCXI-1322 High-Voltage Terminal Block Installation Guide

SCXI chassis

SCXI-1122 module

Number 1 and 2 Phillips-head screwdrivers

1/8 in. flathead screwdriver

Long-nose pliers

Wire cutter

Wire insulation stripper

Summary of Contents for SCXI-1322

Page 1: ...Introduction The SCXI 1322 terminal block consists of a shielded board with 48 screw terminals for easy connection to the SCXI 1122 input connector Sixteen pairs of screw terminals connect to the SCXI 1122 module inputs The remaining seven pairs of screw terminals are for the module excitation channels What You Need to Get Started To set up and use your SCXI 1322 terminal block you need the follow...

Page 2: ... 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 ...

Page 3: ...le 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 s...

Page 4: ...se a single pair of excitation leads for all the loads as shown in Figure 1 Figure 1 Remote Sensing with Multiple Loads Figure 2 shows a setup where remote sensing is not used In this case use a different pair of excitation leads for each load To minimize the voltage drop in each pair of excitation leads use large gauge wires to reduce the I RLEAD drop Figure 2 No Remote Sensing VEX CH 0 120 120 1...

Page 5: ...nse leads connect are correctly regulated The other loads suffer from the voltage drop in their excitation leads because of current flow Figure 3 Multiple Loads with Bad Remote Sensing VEX VEX SENSE SENSE CH 1 120 Ω 120 Ω 120 Ω 120 Ω CH 2 CH 0 120 Ω 120 Ω CH 10 120 Ω 120 Ω 120 Ω 120 Ω CH 3 CH 6 120 Ω 120 Ω Long Wire Bad Connections Bad Connections ...

Page 6: ...tance and returns the thermistor temperature Alternatively you can use the following formulas T C TK 273 15 where TK is the temperature in Kelvin a 1 295361 10 3 b 2 343159 10 4 c 1 018703 10 7 RT resistance of the thermistor in ohms VTEMPOUT output voltage of the temperature sensor where T F and T C are the temperature readings in degrees Fahrenheit and degrees Celsius respectively Note Use an av...

Page 7: ...l 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 7 mm 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 th...

Page 8: ...s the SCXI 1322 signal connections Figure 5 SCXI 1322 Signal Connections 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 1 Solder Lugs 2 Screw Terminals 3 Product Name Assembly Number and Revision Letter 4 R3 5 R4 6 Serial Number 2 7 3 6 4 5 1 Back View Front View 1 6 5 4 2 3 2 ...

Page 9: ...e 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 Specifications All specifications are typical at 25 C unless otherwise specified Cold junction sensor Accuracy1 0 65 from 15 to 35 C 0 85 from 0 to 15 C and 35 to...

Page 10: ...or electrical measuring and test equipment Approved at altitudes up to 2000 meters Installation Category II Pollution Degree 2 Temperature Sensor Circuit Diagram The circuit diagram in Figure 6 is optional information that you can use if you want more details about the SCXI 1322 temperature sensor Figure 6 Temperature Sensor Circuit Diagram 4 7 kΩ 1 5 kΩ 0 1 MTEMP 1 2 1 2 2 5 kΩ at 25o C 10 µF 16 ...

Page 11: ...ide 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 ...

Page 12: ......

Reviews: