National Instruments SCXI-1322 Manuale utente

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.

INSTALLATION GUIDE

SCXI -1322 HIGH-VOLTAGE TERMINAL BLOCK

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

™

SCXI-1322 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.Thisfont also denotes text that 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.

©National Instruments Corporation 3 SCXI-1322 Installation Guide

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

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;

use only 600 V and 60 °C wire for signals that may come in contact with 480 V.

WhenconnectingordisconnectingsignallinestotheSCXIterminalblockscrewterminals,

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.

Using the VEX/SENSE+ and the VEX/SENSE– Terminals

for Strain-Gauge Excitation

Your terminal block has two terminals labeled VEX/SENSE+ and

VEX/SENSE–. When resistors R3 and R4 are loaded (factory default), you

can use the VEX/SENSE+ and VEX/SENSE– terminals as VEX+ and

VEX– terminals, respectively. When you have a heavy load—for example,

all 16 channels are connected to 16 120 Ωstrain-gauge half-bridges—you

should remove resistors R3 and R4 to transform the VEX/SENSE+ and

VEX/SENSE– terminals to sense terminals. These terminals must connect

to the VEX+ and VEX– leads at the load for remote sensing and therefore

compensate for the voltage drop in the excitation leads.

SCXI-1322 Installation Guide 4 www.ni.com

It is important to notice that because the SCXI-1122 provides a single

voltage excitation channel, you can remotely sense your excitation voltage

at a single load location. Therefore, when using multiple loads, you either

have to sense in the terminal block (leave R3 and R4 in place) or make sure

your loads are located close to each other and remotely sense at the end of

the excitation leads. Use 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*R

LEAD drop.

Figure 2. No Remote Sensing

VEX +

CH+(0)

120

SENSE +

Use short lengths of large-gauge

wire to minimize the voltage

drop in each lead.

VEX – SENSE –

Ω

120

Ω

CH+(1) CH+(15)

VEX +

120

VEX –

120

I = 3.333 V

240+ 2RLEAD

RLEAD

Ω

CH+(0) CH+(1) CH+(15)

2RLEAD<< 240Ω

©National Instruments Corporation 5 SCXI-1322 Installation Guide

Figure 3 shows multiple loads with bad remote sensing. Only the load at

which the sense 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

CH+(2)

CH+(0)

120 Ω

CH+(10)

120 Ω

CH+(3)CH+(6)

120 Ω

Long Wire

Bad Connections

SCXI-1322 Installation Guide 6 www.ni.com

Temperature Sensor Output and Accuracy

The SCXI-1322 temperature sensor outputs 1.91 to 0.58 V from 0 to 55 °C

and has an accuracy of ±0.5 °C over the 15 to 35 °C range and ±0.9 °C over

the 0 to 15 °C and 35 to 55 °C ranges.1

National Instruments software can convert a thermistor voltage to the

thermistor temperature for the circuit diagram shown later in this guide.

In LabVIEW, you can use the ConvertThermistorReading VI in the

Data Acquisition»Signal Conditioning palette. If you are using

LabWindows/CVI or NI-DAQ, use the Thermistor_Convert function.

The VI takes the output voltage of the temperature sensor, the reference

voltage, and the precision resistance and returns the thermistor temperature.

Alternatively, you can use the following formulas:

T(° C) = TK– 273.15

where TKis 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 average of a large number of samples to obtain the most accurate reading.

Noisy environments require more samples for greater accuracy.

1 Includes the combined effects of the temperature sensor accuracy and the temperature difference between the temperature

sensor and any screw terminal. The temperature sensor accuracy includes tolerances in all component values, the effects

caused by temperature and loading, and self-heating.

TK1

ab R

ln()cR

ln()

++[]

--------------------------------------------------------------=

RT5000 VTEMPOUT

2.5 VTEMPOUT

–

--------------------------------------





T°F() [T(°C)]9

----------------------- 3+=

©National Instruments Corporation 7 SCXI-1322 Installation Guide

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-1322, follow the labeling on the

SCXI-1322 for the appropriate module, as indicated in Figure 5.

To connect the signal to the terminal block, perform the following steps,

referring to Figures 4 and 5 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.

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.

SCXI-1322 Installation Guide 8 www.ni.com

Figure 4 shows the SCXI-1322 terminal block parts locator diagram.

Figure 4. SCXI-1322 Parts Locator Diagram

Figure 5 shows 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

4R3 5R4

6 Serial Number

Back View Front View

654

©National Instruments Corporation 9 SCXI-1322 Installation Guide

Installation

ToconnecttheterminalblocktotheSCXImodulefrontconnector,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.

Note For accurate cold-junction compensation, place the SCXI chassis away from an

extreme temperature differential.

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.

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 55 °C

Repeatability...................................0.4° from 15 to 35 °C

Output .............................................1.91 to 0.58 V from 0 to 55 °C

Common-mode isolation

Terminal to terminal .......................250 Vrms

Terminal to earth.............................480 Vrms

1 The temperature sensor accuracy includes tolerances in all component values, effects caused by temperature, loading,

self-heating, and temperature gradients.

SCXI-1322 Installation Guide 10 www.ni.com

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

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

5 kΩ

0.1%

MTEMP

5 kΩ

at 25oC 10 µF

16 V 0.1 µF

0.1 µF

-to

+5 V

2.5 V

LM 4040

2.5 V

0.1%

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