National Instruments NI 9481 User Manual

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OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9481

4-Channel SPST Electromechanical Relay Module

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This document describes how to use the National Instruments 9481 and includes specifications and terminal assignments for the NI 9481. Vis it ni.com/info and enter rdsoftwareversion to determine which software you need for the modules you are using. For information about installing, configuring, and programming the system, refer to the system documentation. Visit enter

cseriesdoc for information about C Series documentation.

Note The safety guidelines and specifications in this

ni.com/info and

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.

NI 9481 Operating Instructions and Specifications 2 ni.com

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 V

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.

Caution When module terminals are hazardous voltage

LIVE (>42.4 V

/60 VDC), you must ensure that devices

and circuits connected to the module are properly insulated from human contact. You must 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

NI 9481 Operating Instructions and Specifications 4 ni.com

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 you are 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.

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.

NI 9481 Operating Instructions and Specifications 6 ni.com

Connecting the NI 9481

The NI 9481 has a 10-terminal detachable screw-terminal connector that provides connections for 4 electromechanical relay channels.

CH0a CH0b CH1a CH1b CH2a CH2b CH3a CH3b NC NC

0 1 2 3 4 5 6 7 8 9

Figure 2. NI 9481 Terminal Assignments

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.

CHa

Load

NI 9481

Figure 3. Connecting a Load to the NI 9481

NI 9481 Operating Instructions and Specifications 8 ni.com

CHb

–

Note Yo u must 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 you either 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.

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.

NI 9481 Operating Instructions and Specifications 10 ni.com

Typically, when a system is in sleep mode, you cannot communicate with the modules. In sleep mode, the system consumes minimal power and may dissipate less heat than it does in normal mode. Refer to the Specifications section for more information about power consumption and thermal dissipation.

Specifications

The following specifications are typical for the range –40 to 70 °C unless otherwise noted.

Output Characteristics

Number of channels.......................... 4 electromechanical relay

channels

Relay type ......................................... Single pole single throw

Power-on output state ....................... Channels off

(SPST)

Switching capacity (resistive load)

Switching voltage ....................... 60 VDC max, 250 V

rms

max

Switching current, per channel

One channel on .................... 4 A max at 30 VDC,

1 A max at 60 VDC, 4 A max at 250 V

rms

All channels on .................... 2 A max at 30 VDC,

1 A max at 60 VDC, 2 A max at 250 V

rms

Resistance per channel,

channel on......................................... 50 mΩ

Switching rate ................................... 1 operation per second

Relay release time............................. 5 ms max

Relay operate time ............................ 10 ms max

Relay bounce time ............................ 3 ms

Off state leakage ............................... 10 μAmax

Life expectancy

Mechanical (no load).................. 20,000,000 operations

Electrical (connecting to load) ... 100,000 operations

NI 9481 Operating Instructions and Specifications 12 ni.com

MTBF ............................................... 460,321 hours at 25 °C;

Bellcore Issue 2, Method 1, Case 3, Limited Part Stress Method

Note Contact NI for Bellcore MTBF specifications

at other temperatures or for MIL-HDBK-217F specifications.

Power Requirements

Power consumption from chassis

Active mode ............................... 580 mW max

Sleep mode ................................. 5 mW max

Thermal dissipation (at 70 °C)

Active mode ............................... 1.5 W max

Sleep mode ................................. 5 mW max

Physical Characteristics

If you need to clean the module, wipe it with a dry towel.

Screw-terminal wiring ...................... 12 to 24 AWG copper

conductor wire with 10 mm (0.39 in.) of insulation stripped from the end

Tor que for screw terminals ...............0.5 to 0.6 N · m

(4.4 to 5.3 lb · in.)

Ferrules ............................................. 0.25 mm

to 2.5 mm

Weight............................................... 150 g (5.3 oz)

Safety

Safety Voltages

Connect only voltages that are within the following limits.

CHa-to-CHb...................................... 250 V

Measurement Category II

Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution system. This category refers to local-level electrical distribution, such as

NI 9481 Operating Instructions and Specifications 14 ni.com

rms

max,

that provided by a standard wall outlet, for example, 115 V for U.S. or 230 V for Europe.

Caution Do not connect the NI 9481 to signals or use

for measurements within Measurement Categories III or IV.

Isolation

Channel-to-channel

Continuous ........................... 250 V

Withstand ............................. 1,400 V

rms

, verified by a 5 s

rms

dielectric withstand test

Channel-to-earth ground

Continuous ........................... 250 V

Withstand ............................. 2,300 V

rms

, verified by a 5 s

rms

dielectric withstand test

Hazardous Locations

U.S. (UL) .......................................... Class I, Division 2,

Groups A, B, C, D, T4; Class I, Zone 2, AEx nC IIC T4

Safety Standards

This product meets the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use:

• IEC 61010-1, EN 61010-1

• UL 61010-1, CSA 61010-1

Note For UL and other safety certifications, refer to the

product label or the Online Product Certification section.

Electromagnetic Compatibility

This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:

• EN 61326 (IEC 61326): Class A emissions; Basic immunity

• EN 55011 (CISPR 11): Group 1, Class A emissions

• AS/NZS CISPR 11: Group 1, Class A emissions

• FCC 47 CFR Part 15B: Class A emissions

• ICES-001: Class A emissions

NI 9481 Operating Instructions and Specifications 16 ni.com

Note For the standards applied to assess the EMC of this

product, refer to the Online Product Certification section.

Note For EMC compliance, operate this device with

shielded cabling.

CE Compliance

This product meets the essential requirements of applicable European Directives as follows:

• 2006/95/EC; Low-Voltage Directive (safety)

• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)

Online Product Certification

Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit ni.com/

certification

click the appropriate link in the Certification column.

, search by module number or product line, and

Shock and Vibration

To meet these specifications, you must panel mount the system and either affix ferrules to the ends of the terminal wires or use the NI 9932 backshell kit to protect the connections.

Operating vibration,

sinusoidal (IEC 60068-2-6) ..............5 g, 40 to 500 Hz; 0.062 in.

double amplitude, 10 to 40 Hz

Environmental

National Instruments C Series modules are intended for indoor use only but may be used outdoors if installed in a suitable enclosure. Refer to the manual for the chassis you are using for more information about meeting these specifications.

Operating temperature

(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 70 °C

Storage temperature

(IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C

Ingress protection.............................. IP 40

NI 9481 Operating Instructions and Specifications 18 ni.com

Operating humidity

(IEC 60068-2-56).............................. 10 to 90% RH,

noncondensing

Storage humidity

(IEC 60068-2-56).............................. 5 to 95% RH,

noncondensing

Maximum altitude............................. 2,000 m

Pollution Degree (IEC 60664).......... 2

Environmental Management

NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers.

For additional environmental information, refer to the NI and the Environment Web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.

Waste Electrical and Electronic Equipment (WEEE)

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Ё೑ᅶ᠋

EU Customers At the end of the life cycle, all products

must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit

environment/weee

ni.com/

RoHS

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National Instruments

National InstrumentsЁ೑RoHS

ni.com/environment/rohs_china

about China RoHS compliance, go to

environment/rohs_china

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Ǆ݇Ѣ

(RoHS)

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(For information

ni.com/

NI 9481 Operating Instructions and Specifications 20 ni.com

Where to Go for Support

The National Instruments Web site is your complete resource for technical support. At everything from troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers.

National Instruments corporate headquarters is located at 11500 North Mopac Expressway, Austin, Texas, 78759-3504. National Instruments also has offices located around the world to help address your support needs. For telephone support in the United States, create your service request at and follow the calling instructions or dial 512 795 8248. For telephone support outside the United States, contact your local branch office:

Australia 1800 300 800, Austria 43 662 457990-0, Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599, Canada 800 433 3488, China 86 21 5050 9800, Czech Republic 420 224 235 774, Denmark 45 45 76 26 00, Finland 358 (0) 9 725 72511, France 01 57 66 24 24, Germany 49 89 7413130, India 91 80 41190000, Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,

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NI 9481 Operating Instructions and Specifications 22 ni.com

National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the Terms of Use section on product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the

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patents.txt file on your media, or the National Instruments Patent Notice

373507D-01 Sep08