National Instruments 8-Channel Solid-State Relay (SSR) Digital Output NI... Bedienungsanleitung

OPERATING INSTRUCTIONS

NI 9485

8-Channel Solid-State Relay (SSR) Digital Output

Module

NI 9485 Operating Instructions 2 ni.com

These operating instructions describe how to use the National

Instruments 9485. For information about installing, configuring,

and programming the system, refer to the system documentation.

Visit ni.com/info and enter the info code rdsoftwareversion

to determine which software you need for the modules you are

using.

Note The safety guidelines and specifications in this

document are specific to the NI 9485. 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.

Safety Guidelines

Operate the NI 9485 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 When module terminals are hazardous voltage

LIVE (>42.4Vpk/60 VDC), you must ensure that devices

and circuits connected to the module are properly

insulated from human contact. You must use the NI 9939

connector backshell kit to ensure that the terminals are

not accessible.

NI 9485 Operating Instructions 4 ni.com

Figure 1 shows the NI 9939 connector backshell.

Figure 1. NI 9939 Connector Backshell

Safety Guidelines for Hazardous Locations

The NI 9485 is suitable for use in Class I, Division 2, Groups A, B,

C, D, T4 hazardous locations; Class I, Zone 2, AEx nA II T4 and

Ex nA II T4 hazardous locations; and nonhazardous locations only.

Follow these guidelines if you are installing the NI 9485 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.

Caution For Zone 2 applications, install a protection

device across the positive and negative terminals of the

external power supply (or supplies). The device must

prevent the external power supply from exceeding

80 V if there is a transient overvoltage condition.

NI 9485 Operating Instructions 6 ni.com

Special Conditions for Hazardous Locations Use in Europe

This equipment has been evaluated as EEx nA II T4 equipment

under DEMKO Certificate No. 03 ATEX 0324020X. The

equipment is marked II 3G and is suitable for use in

Zone 2 hazardous locations.

Wiring the NI 9485

The NI 9485 has a 16-terminal, detachable screw-terminal

connector that provides connections for eight solid-state relay

channels. Each channel has two interchangeable terminals, CHa

and CHb. Refer to Table 1 for the terminal assignments for each

channel.

Table 1. Terminal Assignments

Module Ter mi nal Signal

0CH0a

1CH0b

2CH1a

3CH1b

4CH2a

5CH2b

6CH3a

7CH3b

8CH4a

9CH4b

10 CH5a

11 CH5b

12 CH6a

13 CH6b

14 CH7a

15 CH7b

NI 9485 Operating Instructions 8 ni.com

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 9939 backshell

kit to protect the connections. Refer to Figure 2 for an illustration.

Figure 2. 16-Pin Detachable Screw Terminal with Ferrule

Ferrule

Connecting Loads to the NI 9485

You can connect loads to the NI 9485. Connect the load to one of

the leads of the power source. Connect either the CHa or the CHb

terminal to the load and the other terminal to the other lead of the

AC or DC power source. Figure 3 shows a possible configuration

where the load is connected to the CHb terminal and the DC or AC

power source.

Figure 3. Connecting a Load to the NI 9485

NI 9485

–

Load

CHa

CHb

NI 9485 Operating Instructions 10 ni.com

When you write an ON command to a channel, the SSR is closed

and the terminal that is connected to the load allows current to flow

or allows voltage to be applied to the load. When you write an OFF

command to a channel, the switch opens, disconnecting the circuit

so no current flows and no voltage is applied to the load.

Protecting Inductive Loads

When inductive loads are connected to the NI 9485 relay outputs,

a large counter-electromotive force may occur at switching time

because of the energy stored in the inductive load. These flyback

voltages can damage the relay outputs and/or the external power

supply.

Limit flyback voltages at your inductive load by installing one of

the following:

• For DC loads—Install a flyback diode within 18 in. of the load.

• For AC loads—Install a metal oxide varistor (MOV) rated for

30 Vrms or slightly higher.

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