National Instruments NI 9481 Manual de usuario

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9481

4-Channel SPST Electromechanical Relay Module

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NI 9481 Operating Instructions and Specifications 2 ni.com

This document describes how to use the National Instruments 9481

and includes specifications and terminal assignments for the NI 9481.

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 9481. 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 9481 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 9481 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 9932

connector backshell kit to ensure that the terminals are

not accessible.

Figure 1 shows the NI 9932 connector backshell.

Figure 1. NI 9932 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9481 is suitable for use in Class I, Division 2, Groups A, B,

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

hazardous locations; and nonhazardous locations only. Follow

these guidelines if youare installing the NI 9481 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 9481 Operating Instructions and Specifications 6 ni.com

Special Conditions for Marine Applications

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

marine applications. To verify Lloyd’s Register certification, visit

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.

Connecting the NI 9481

The NI 9481 has a 10-terminal detachable screw-terminal connector

that provides connections for 4 electromechanical relay channels.

Figure 2. NI 9481 Terminal Assignments

CH0a

CH0b

CH1a

CH1b

CH2a

CH2b

CH3a

CH3b

NI 9481 Operating Instructions and Specifications 8 ni.com

Each electromechanical relay channel has two interchangeable

terminals, CHa and CHb.

Each channel has an LED that indicates the state of the channel.

When a channel LED is lit, the channel is on. When the LED is

dark, the channel is off. The LEDs are disabled when the chassis

is in sleep mode. Refer to the Sleep Mode section for more

information about sleep mode.

When connecting a load to the NI 9481, connect the positive lead

of the load to either the CHa or the CHb terminal, and the ground

of the load to one of the leads of the power supply. Connect the

remaining CHa or CHb terminal to the other lead of the power

supply. Figure 3 shows a possible configuration.

Figure 3. Connecting a Load to the NI 9481

NI 9481

–

CHa

CHbAC

Load

Note Youmust use 2-wire ferrules to create a secure

connection when connecting more than one wire to a

single terminal on the NI 9481.

When the channel is turned on, the terminal connected to the load

drives current or applies voltage to the load. When the channel is

off, the terminal does not drive current or apply voltage to the load.

Wiring for High-Vibration Applications

If an application is subject to high vibration, National Instruments

recommends that youeither use ferrules to terminate wires to the

detachable screw-terminal connector or use the NI 9932 backshell

kit to protect the connections. Refer to Figure 4 for an illustration

of using ferrules. Refer to Figure 1 for an illustration of the

NI 9932 connector backshell.

NI 9481 Operating Instructions and Specifications 10 ni.com

Figure 4. 10-Terminal Detachable Screw-Terminal Connector with Ferrule

Sleep Mode

This module supports a low-power sleep mode. Support for sleep

mode at the system level depends on the chassis that the module is

plugged into. Refer to the chassis manual for information about

support for sleep mode. If the chassis supports sleep mode, refer to

the software help for information about enabling sleep mode. Visit

ni.com/info and enter cseriesdoc for information about

C Series documentation.

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