National Instruments NI 9481E User manual

OPERATING INSTRUCTIONS AND SPECIFICATIONS

NI 9481E

4-Channel SPST Electromechanical Relay Module

NI 9481E Operating Instructions and Specifications 2 ni.com

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 no electromagnetic

compatibility (EMC) or CE marking compliance claims

for the NI 9481E. The end-product supplier is responsible

for conformity to any and all compliance requirements.

Caution The NI 9481E must be installed inside a suitable

enclosure prior to use. Hazardous voltages may be present.

NI 9481E Dimensions

The following figure shows the dimensions of the NI 9481E.

Figure 1. NI 9481E Dimensions in Millimeters (Inches)

73.4 (2.89)

0.0 (0.00)

26.7 (1.05)

58.4 (2.30)

66.0 (2.60)

0.0 (0.00)

NI 9481E Operating Instructions and Specifications 4 ni.com

Connecting the NI 9481E

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

connector that provides connections for four electromechanical

relay channels.

Figure 2. NI 9481E Terminal Assignments

CH0a

CH0b

CH1a

CH1b

CH2a

CH2b

CH3a

CH3b

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 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 9481E

NI 9481E

–

CHa

CHbAC

Load

NI 9481E Operating Instructions and Specifications 6 ni.com

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 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.

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 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 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

NI 9481E Operating Instructions and Specifications 8 ni.com

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

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

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 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.)

Weight............................................... 76 g (2.7 oz)

NI 9481E Operating Instructions and Specifications 10 ni.com

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

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 signals or use

for measurements within Measurement Categories III

or IV.

Isolation

Channel-to-channel

Continuous ........................... 250 Vrms

(Basic insulation)

Withstand ............................. 1,400 Vrms, verified by a 5 s

dielectric withstand test

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