National Instruments NI 9214 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9214 with NI TB-9214

16-Channel Thermocouple Input Module with

Terminal Block

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NI_9214.fm Page 1 Monday, November 1, 2010 9:52 AM

NI 9214 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9214 in

conjunction with an NI TB-9214 terminal block and includes

specifications for the NI 9214 and terminal assignments for the

NI TB-9214. Visit ni.com/info and enter rdsoftwareversion

to determine which software youneed for the modules youare using.

For information about installing, configuring, and programming the

system, refer to the system documentation. Visit ni.com/info and

enter cseriesdoc for information about C Series documentation.

Visit ni.com/info and enter compatibility for information

about chassis and carrier compatibility for the modules youare

using.

Note The safety guidelines and specifications in this

document are specific to the NI 9214 used in conjunction

with an NI TB-9214. The other components in the system

might not meet the same safety ratings and specifications.

Refer to the documentation for each component in the

system to determine the safety ratings and specifications

for the entire system. Visit ni.com/info and enter

cseriesdoc for information about C Series

documentation.

NI_9214.fm Page 2 Monday, November 1, 2010 9:52 AM

Safety Guidelines

Operate the NI 9214 only as described in these operating

instructions.

Hot Surface This icon denotes that the component may be

hot. Touching this component may result in bodily injury.

Safety Guidelines for Hazardous Voltages

If hazardous voltages are connected to the module, take the

following precautions. A hazardous voltage is a voltage greater

than 42.4 Vpk or 60 VDC to earth ground.

Caution Ensure that hazardous voltage wiring is

performed only by qualified personnel adhering to local

electrical standards.

Caution Do not mix hazardous voltage circuits and

human-accessible circuits on the same module.

Caution Make sure that devices and circuits connected to

the module are properly insulated from human contact.

NI_9214.fm Page 3 Monday, November 1, 2010 9:52 AM

NI 9214 Operating Instructions and Specifications 4 ni.com

Caution When module terminals are hazardous voltage

LIVE (>42.4 Vpk/60 VDC), youmust ensure that devices

and circuits connected to the module are properly

insulated from human contact. Youmust use the

NI TB-9214 terminal block included with the NI 9214

to ensure that the terminals are not accessible.

Figure 1 shows the NI TB-9214 terminal block.

Figure 1. NI TB-9214 Terminal Block

Note The NI TB-9214 contains a plastic insert to prevent

accidental wire contact with the metal enclosure.

NI_9214.fm Page 4 Monday, November 1, 2010 9:52 AM

Safety Guidelines for Hazardous Locations

The NI 9214 is suitable for use in Class I, Division 2, Groups A, B,

C, D, T4 hazardous locations; Class I, Zone 2, AEx nA IIC T4, and

Ex nA IIC T4 hazardous locations; and nonhazardous locations

only. Follow these guidelines if youare installing the NI 9214 in a

potentially explosive environment. Not following these guidelines

may result in serious injury or death.

Caution Do not disconnect I/O-side wires or connectors

unless power has been switched off or the area is known

to be nonhazardous.

Caution Do not remove modules unless power has been

switched off or the area is known to be nonhazardous.

Caution Substitution of components may impair

suitability for Class I, Division 2 and Zone 2.

Caution For Division 2 and Zone 2 applications, install

the system in an enclosure rated to at least IP 54 as

defined by IEC 60529 and EN 60529.

Caution For Division 2 and Zone 2 applications,

connected signals must be within the following limit:

Capacitance .......................... 0.2 F max

NI_9214.fm Page 5 Monday, November 1, 2010 9:52 AM

NI 9214 Operating Instructions and Specifications 6 ni.com

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as Ex nA IIC T4 equipment

under DEMKO Certificate No. 07 ATEX 0626664X. Each module

is marked II 3G and is suitable for use in Zone 2 hazardous

locations, in ambient temperatures of –40 °C Ta 70 °C. If you

are using the NI 9214 in Gas Group IIC hazardous locations, you

must use the device in an NI chassis that has been evaluated as

Ex nC IIC T4, EEx nC IIC T4, Ex nA IIC T4, or Ex nL IIC T4

equipment.

Electromagnetic Compatibility Guidelines

This product was tested and complies with the regulatory

requirements and limits for electromagnetic compatibility (EMC)

as stated in the product specifications. These requirements and

limits are designed to provide reasonable protection against

harmful interference when the product is operated in its intended

operational electromagnetic environment.

This product is intended for use in industrial locations. There is no

guarantee that harmful interference will not occur in a particular

installation, when the product is connected to a test object, or if the

product is used in residential areas. To minimize the potential for

the product to cause interference to radio and television reception

NI_9214.fm Page 6 Monday, November 1, 2010 9:52 AM

or to experience unacceptable performance degradation, install and

use this product in strict accordance with the instructions in the

product documentation.

Furthermore, any changes or modifications to the product not

expressly approved by National Instruments could void your

authority to operate it under your local regulatory rules.

Caution When operating this product, use shielded

cables and accessories.

Special Guidelines for Marine Applications

Some products are Lloyd’s Register (LR) Type Approved for

marine (shipboard) applications. To verify Lloyd’s Register

certification for a product, visit ni.com/certification and

search for the LR certificate, or look for the Lloyd’s Register mark

on the product label.

Caution In order to meet the EMC requirements for

marine applications, install the product in a shielded

enclosure with shielded and/or filtered power and

input/output ports. In addition, take precautions when

designing, selecting, and installing measurement probes

and cables to ensure that the desired EMC performance is

attained.

NI_9214.fm Page 7 Monday, November 1, 2010 9:52 AM

NI 9214 Operating Instructions and Specifications 8 ni.com

Connecting the NI 9214

The NI TB-9214 provides connections for 16 thermocouple

channels on the NI 9214.

Figure 2. NI TB-9214 Terminal Reference

TC0+

TC0–

TC1+

TC1–

TC5+

TC5–

TC6+

TC6–

TC2+

TC4–

TC4+

TC3+

TC3–

TC2–

TC7+

TC9–

TC9+

TC8+

TC8–

TC7–

TC10+

TC12–

TC12+

TC11+

TC11–

TC10–

TC13+

TC15–

TC15+

TC14+

TC14–

TC13–

COM

NI_9214.fm Page 8 Monday, November 1, 2010 9:52 AM

Youcan connect thermocouple input signals to the NI 9214.

Connect the positive lead of the thermocouple to the TC+ terminal

and the negative lead of the thermocouple to the TC– terminal. If

youare unsure which of the thermocouple leads is positive and

which is negative, check the thermocouple documentation or the

thermocouple wire spool.

The NI 9214 also has two common terminals, COM, that are

internally connected to the isolated ground reference of the

module. A connection to COM is not necessary for most

applications. Specifically, leave COM unconnected for

configurations in which all thermocouples are floating, all

thermocouples are referenced to the same common-mode voltage,

or one thermocouple is referenced to a common-mode voltage and

all others are floating.

However, for configurations in which two or more thermocouples

are referenced to different common-mode voltages, connecting

COM according to the following guidelines improves

common-mode rejection performance. Connect COM to chassis

ground if the common-mode to chassis voltages are smaller than

±1.2 V. Otherwise, connect COM to a valid common-mode voltage

reference that is within ±1.2 V of the common-mode voltages of all

the thermocouple inputs.

NI_9214.fm Page 9 Monday, November 1, 2010 9:52 AM

NI 9214 Operating Instructions and Specifications 10 ni.com

Connecting the Signals

To connect thermocouple wires to the NI TB-9214, complete the

following steps while referring to Figure 3.

1. Loosen the captive screws and remove the top cover.

2. Remove the foam pad from the NI TB-9214 opening.

3. Prepare the screw-terminal wire by stripping the outer

insulation and inner insulation. Refer to the Specifications

section for more information on screw-terminal wiring.

4. Insert the stripped end of the wire fully into the appropriate

terminal. Make sure no exposed wire extends past the screw

terminal.

5. Secure the connection by tightening the screw for the terminal.

Refer to the Specifications section for information on

screw-terminal torque.

6. Route the wire through the NI TB-9214 opening.

7. Remove slack in the NI TB-9214 wiring and secure the wires

by threading a zip tie through the two strain relief holes on the

NI TB-9214 opening.

NI_9214.fm Page 10 Monday, November 1, 2010 9:52 AM

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