National Instruments NI 9229 Manuale utente

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9229/9239

4-Channel, ±60/±10 V, 24-Bit Simultaneous,

Channel-to-Channel Isolated Analog Input Modules

ni.com/manuals

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NI 9229/9239 2 ni.com

This document describes how to use the National Instruments 9229

and National Instruments 9239 and includes specifications and

terminal assignments. In this document, the NI 9229 and NI 9239

are referred to inclusively as the NI 9229/9239. 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.

Note The safety guidelines and specifications in this

document are specific to the NI 9229/9239. 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.

Safety Guidelines

Operate the NI 9229/9239 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 9229/9239 4 ni.com

Caution When module terminals are hazardous voltage

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

and circuits connected to the module are properly

insulated from human contact. Youmust use the NI 9971

connector backshell kit to ensure that the terminals are

not accessible.

Figure 1 shows the NI 9971 connector backshell.

Figure 1. NI 9971 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9229/9239 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 9229/9239 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.

Caution For Zone 2 applications, install the system

in an enclosure rated to at least IP 54 as defined by

IEC 60529 and EN 60529.

NI 9229/9239 6 ni.com

Caution For Zone 2 applications, install a protection

device between the input signal and the NI 9229/9239

input terminal. The device must prevent the input

channel-to-COM voltage from exceeding 85 V if there is

a transient overvoltage condition.

Caution For Zone 2 applications, connected signals must

be within the following limit:

Capacitance .......................... 0.01 μF max

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. If youare using the NI 9229/9239 in Gas

Group IIC hazardous locations or in ambient temperatures of

–40 °C ≤Ta ≤70 °C, youmust use the device in an NI chassis that

has been evaluated as EEx nC IIC T4, Ex nA IIC T4, or

Ex nL IIC T4 equipment.

Special Conditions for Marine Applications

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

marine applications. To verify Lloyd’s Register certification, go to

ni.com/certification and search for the LR certificate, or

look for the Lloyd’s Register mark on the module.

Caution To meet radio frequency emission requirements

for marine applications, use shielded cables and install

the system in a metal enclosure. Suppression ferrites

must be installed on power supply inputs near power

entries to modules and controllers. Power supply and

module cables must be separated on opposite sides of the

enclosure and must enter and exit through opposing

enclosure walls.

NI 9229/9239 8 ni.com

Connecting the NI 9229/9239

The NI 9229/9239 provides connections for four simultaneously

sampled, isolated analog input channels.

Figure 2. NI 9229/9239 Terminal Assignments

AI0+

AI0–

AI1+

AI1–

AI2+

AI2–

AI3+

AI3–

The NI 9229/9239 has four 2-terminal detachable screw-terminal

connectors.

Note Youmust use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9229/9239.

Yo ucan connect ground-referenced or floating signal sources to

the NI 9229/9239. Connect the positive signal of the signal source

to the AI+ terminal or connector, and connect the negative signal

of the signal source to the AI– terminal or connector. If youmake

a ground-referenced connection between the signal source and the

NI 9229/9239, make sure the voltage on the AI+ and AI–

connections are in the channel-to-earth safety voltage range to

ensure proper operation of the NI 9229/9239. Refer to the

Specifications section for more information about operating

voltages and overvoltage protection. Refer to Figures 3 and 4 for

illustrations of how to connect grounded and floating signal

sources to the NI 9229/9239.

NI 9229/9239 10 ni.com

Figure 3. Connecting a Grounded Signal Source to the NI 9229/9239

Figure 4. Connecting a Floating Signal Source to the NI 9229/9239

NI 9229/9239

Signal

Source

AI–

–

AI+

NI 9229/9239

Signal

Source

AI–

–

AI+

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