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OPERATING INSTRUCTIONS AND SPECIFICATIONS
NI 9481E
4-Channel SPST Electromechanical Relay Module
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This document describes how to use the National Instruments 9481E and includes dimensions, terminal assignments, and specifications for the NI 9481E. Visit 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 ni.com/info and enter cseriesdoc for information about C Series documentation. Caution National Instruments makes
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NI 9481E Dimensions The following figure shows the dimensions of the NI 9481E. 73.4 (2.89) 0.0 (0.00) Figure 1. NI 9481E Dimensions in Millimeters (Inches) © National Instruments Corp. 3 NI 9481E Operating Instructions and Specifications 0.0 (0.00) 26.7 (1.05) 58.4 (2.30) 66.0 (2.60)
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Connecting the NI 9481E The NI 9481E has a 10-terminal detachable screw-terminal connector that provides connections for four electromechanical relay channels. 0 3 CH0a 0 CH0b 1 CH1a 2 CH1b 3 CH2a 4 CH2b 5 CH3a 6 CH3b 7 NC 8 NC 9 Figure 2. NI 9481E Terminal Assignments NI 9481E Operating Instructions and Specifications 4 ni.com
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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 9481E, connect the positive lead of the load to either the CHa or the CHb terminal, and the gr
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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 9481E. 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. 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 int
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Specifications The following specifications are typical for the range –40 to 85 °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 Switching capacity (resistive load) Switching voltage.......................60 VDC max, 250 V max rms Switching current, per channel One channel on
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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 oper
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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 Use a dry, low-velocity stream of air to clean the module. If needed, use a soft-bristle brush for cleaning around components. Screw-terminal wiring ......................12 to 24
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Safety Safety Voltages Connect only voltages that are within the following limits. max, CHa-to-CHb......................................250 V rms 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 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 9481E to si
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Channel-to-earth ground Continuous ...........................250 V rms (Double insulation) Withstand ............................. 2,300 V , verified by a 5 s rms dielectric withstand test Safety Standards This product meets the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use when installed in a suitable enclosure: � IEC 61010-1, EN 61010-1 � UL 61010-1, CSA 61010-1 Note For UL and other safety certifications, refer to t
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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 85 °C Storage temperature (IEC 60068-2-1, IEC 60068-2-2) .....–40 to 85 °C Operating humidity (IEC 60068-2-56)..............................10 to 90% RH, noncondensing Storage
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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 informatio
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RoHS National Instruments (RoHS) National Instruments RoHS ni.com/environment/rohs_china (For information ni.com/ about China RoHS compliance, go to environment/rohs_china.) 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. Na
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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 413091, Japan 81 3 5472 2970, Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
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