National Instruments Network Card NI 9481 User Manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS  
NI 9481  
4-Channel SPST Electromechanical Relay Module  
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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.  
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Caution When module terminals are hazardous voltage  
LIVE (>42.4 Vpk/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  
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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.  
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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.  
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Connecting the NI 9481  
The NI 9481 has a 10-terminal detachable screw-terminal connector  
that provides connections for 4 electromechanical relay channels.  
0
3
CH0a  
CH0b  
CH1a  
CH1b  
CH2a  
CH2b  
CH3a  
CH3b  
NC  
0
1
2
3
4
5
6
7
8
9
NC  
Figure 2. NI 9481 Terminal Assignments  
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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  
+
or  
Load  
AC  
CHb  
NI 9481  
Figure 3. Connecting a Load to the NI 9481  
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Note You 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.  
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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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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  
(SPST)  
Power-on output state .......................Channels off  
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Switching capacity (resistive load)  
Switching voltage.......................60 VDC max, 250 Vrms 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 Vrms  
All channels on ....................2 A max at 30 VDC,  
1 A max at 60 VDC,  
2 A max at 250 Vrms  
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 μA max  
Life expectancy  
Mechanical (no load)..................20,000,000 operations  
Electrical (connecting to load) ...100,000 operations  
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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  
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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  
Torque for screw terminals ...............0.5 to 0.6 N · m  
(4.4 to 5.3 lb · in.)  
Ferrules .............................................0.25 mm2 to 2.5 mm2  
Weight...............................................150 g (5.3 oz)  
Safety  
Safety Voltages  
Connect only voltages that are within the following limits.  
CHa-to-CHb......................................250 Vrms max,  
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  
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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 Vrms  
Withstand .............................1,400 Vrms, verified by a 5 s  
dielectric withstand test  
Channel-to-earth ground  
Continuous...........................250 Vrms  
Withstand .............................2,300 Vrms, verified by a 5 s  
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  
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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  
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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, search by module number or product line, and  
click the appropriate link in the Certification column.  
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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  
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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.  
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Waste Electrical and Electronic Equipment (WEEE)  
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 ni.com/  
environment/weee.  
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Where to Go for Support  
The National Instruments Web site is your complete resource for  
technical support. At ni.com/support you have access to  
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 ni.com/support  
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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Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,  
Malaysia 1800 887710, Mexico 01 800 010 0793,  
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,  
Norway 47 (0) 66 90 76 60, Poland 48 22 3390150,  
Portugal 351 210 311 210, Russia 7 495 783 6851,  
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,  
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,  
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,  
Taiwan 886 02 2377 2222, Thailand 662 278 6777,  
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545  
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