National Instruments SCXI -1314 Manual de usuario

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INSTALLATION GUIDE

SCXI -1314 UNIVERSAL STRAIN TERMINAL BLOCK

This guide describes how to install and use the SCXI-1314 terminal block

with your SCXI-1520 module.

Introduction

The SCXI-1314 terminal block is used with the SCXI-1520 universal

strain/bridge module enabling you to conveniently connect strain gauges

through screw terminals. There are 88 screw terminals arranged in eight

groups of 11. Each group corresponds to one of the eight channels available

on the SCXI-1520. (Refer to Figure 2 for a diagram of terminal locations.)

The signal names of the terminals for each channel are listed in Table 1.

Each channel input contains screw terminals that connect to the inputs of

the SCXI-1520, two precision 100 kΩshunt calibration resistors, and a

precision quarter-bridge completion resistor. The SCXI-1520 contains

Table 1. Signal Names

Signal Name Condition

P+ Positive excitation signal

P– Negative excitation signal

S+ Positive input signal

S– Negative input signal

QTR Quarter-bridge completion resistor connection

RS+ Positive remote sense signal

RS– Negative remote sense signal

SCA

(2 terminals)

Shunt calibration A signal

SCB

(2 terminals)

Shunt calibration B signal

™

SCXI-1314 Universal Strain Terminal Block 2 ni.com

relays that switch the resistors in and out of the input circuit to provide

shunt calibration and quarter-bridge completion.

The quarter-bridge completion resistor has a factory default value of 350 Ω

for use with a 350 Ω strain gauge. These resistors are placed in sockets on

the terminal block so you can easily replace them with resistors suitable to

your specific strain gauge. If your application requires a 120 Ω strain

gauge, use the eight 120 Ωresistors included in the kit.

For a complete description of the use and operation of the SCXI-1520

module, refer to the SCXI-1520 User Manual.

What You Need to Get Started

To install and use your SCXI-1314 terminal block, you need the following

items:

❑SCXI-1314 terminal block

❑SCXI-1314 Universal Strain Terminal Block Installation Guide

❑Eight precision 120 Ωresistors for use in quarter-bridge completion

circuits (if using 120 Ωstrain gauges)

❑SCXI chassis

❑SCXI-1520 module

❑SCXI-1520 User Manual

❑Number 1 and 2 Phillips-head screwdrivers

❑1/8 in. flathead screwdriver

❑Long-nose pliers

❑Wire cutter

❑Wire insulation stripper

©National Instruments Corporation 3 SCXI-1314 Universal Strain Terminal Block

Connecting the Signals

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

referring to Figures 1 and 2 as necessary:

Figure 1. SCXI-1314 Parts Locator Diagram

1. Unscrew the top cover screws and remove the top 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

7 mm.

5. Connect the signal 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 a

short circuit that can cause circuit failure.

When connecting your signals to the SCXI-1314, follow the labeling

on the SCXI-1314, as indicated in Figure 2.

1 Top Cover Screws

2 Top Cover

3 Thumbscrew

4 Mating Connector

5 Strain-Relief Bar

6 Strain-Relief Screws

7 Safety-Ground

Lug

SCXI-1314 Universal Strain Terminal Block 4 ni.com

Figure 2. SCXI-1314 Signal Connections

6. Tighten the terminal screws to a torque of 5 to 7 in.-lb.

7. Reinstall the strain-relief bar and tighten the strain-relief screws.

8. Reinstall the top cover and tighten the top cover screws.

9. Connect the terminal block to the module front connector as explained

in the Installing the Terminal Block section.

1 Safety Ground Lug

2 Cable Strain Relief

3 Serial Number

4 Assembly Number

5 Screw Terminal and Associated Resistors

for <CH0...CH7>

6 Shunt Calibration B Resistors, 8 places

(Factory Default = 100 kΩ,0.1%)

7 Shunt Calibration A Resistors, 8 places

(Factory Default = 100 kΩ, 0.1%)

8 Quarter-Bridge Completion Resistor, 8 places

(Factory Default = 350 Ω, 0.1%)

RPJ

SCB

SCA

QTR

SCBSCAQTR

J2 J3 J4 J5

SCXI-1314

S/N

J6 J7 J8 J9

ASSY187212A-01

UNIVERSAL STRAIN

CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7

1 2 3 4

RPJ

SCB

SCA

QTR

SCBSCAQTR

J2 J3 J4 J5

SCXI-1314

S/N

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

SCB

SCA

P–

S–

RS–

P+

QTR

S+

RS+

J6 J7 J8 J9

ASSY187212A-01

UNIVERSAL STRAIN

CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7

©National Instruments Corporation 5 SCXI-1314 Universal Strain Terminal Block

Installing the Terminal Block

To connect the terminal block to the SCXI module front connector, 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 it to service.

Calibrating the Terminal Block

For information on calibrating the SCXI-1314 see the SCXI-1314

Universal Strain Terminal Block Calibration Procedure located online at

ni.com/calibration and follow the link for Manual Calibration

Procedures.

Specifications

All specifications are typical at 25 °C unless otherwise specified.

Electrical

Accuracy of resistors

120 Ω completion resistor............... ±0.1%

350 Ωcompletion resistor............... ±0.1%

100 kΩshunt calibration resistor.... ±0.1%

Temperature coefficient of resistors

120 Ω completion resistor............... ±10 ppm/°C

350 Ωcompletion resistor............... ±10 ppm/°C

100 kΩshunt calibration resistor.... ±10 ppm/°C

SCXI-1314 Universal Strain Terminal Block 6 ni.com

Mechanical

Resistor sockets

Mating lead size...............................0.023 to 0.026 in.

Mating lead length...........................0.110 to 0.175 in.

Lead spacing....................................0.500 in.

Environment

Operating temperature ............................0 to 50 °C

Storage temperature................................–20 to 70 °C

Relative humidity ...................................10 to 90%

Indoor use only

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