National Instruments CFP-RLY-421 User manual

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FieldPoint Operating Instructions

cFP-RLY-421

Eight-Channel SPST Relay Module

These operating instructions describe how to install and use the

National Instruments cFP-RLY-421 relay module, revision

185151C-01 and later. For information about installing and using

earlier revisions of the cFP-RLY-421, refer to document number

323617B-01. Earlier revisions of the cFP-RLY-421 display the

following symbol on the module label: .

For information about configuring and accessing the cFP-RLY-421

over a network, refer to the user manual for the FieldPoint network

module you are using.

Features

The cFP-RLY-421 is a Compact FieldPoint relay output module

with the following features:

• Eight single-pole single-throw (SPST) relay channels

• Switches up to 1.5 A at 40 VDC or 250 VAC

• –40 to 55 °C operation

• 250 Vrms CAT II continuous channel-to-ground isolation,

verified by 2,300 Vrms, 5 s dielectric withstand test

• Hot swappable

Installing the cFP-RLY-421

The cFP-RLY-421 mounts on a Compact FieldPoint backplane

(cFP-BP-x), which provides operating power to the module.

Installing the cFP-RLY-421 onto a powered backplane does not

disrupt the operation of the bank.

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To install the cFP-RLY-421, refer to Figure 1 and complete the

following steps:

1. Align the captive screws on the cFP-RLY-421 with the holes

on the backplane. The alignment keys on the cFP-RLY-421

prevent backward insertion.

2. Press firmly to seat the cFP-RLY-421 on the backplane.

3. Using a number 2 Phillips screwdriver with a shank of at least

64 mm (2.5 in.) length, tighten the captive screws to 1.1 N ⋅m

(10 lb ⋅in.) of torque. The nylon coating on the screws prevents

them from loosening.

Figure 1. Installing the cFP-RLY-421

1 cFP I/O Module

2 Captive Screws

3 cFP Controller Module

4 Screw Holes

5 cFP Backplane

2 1

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Wiring the cFP-RLY-421

The cFP-CB-xconnector block has connections for each of the

eight cFP-RLY-421 relay channels and for an external supply to

power field devices. If you are using the cFP-RLY-421 in a

hazardous voltage application, you must use the cFP-CB-1

connector block or a suitable hazardous voltage cable. A hazardous

voltage is a voltage greater than 42.4 Vpeak or 60 VDC.

Caution Ensure that hazardous voltage wiring is

performed only by qualified personnel adhering to local

electrical standards.

Each relay channel of the cFP-RLY-421 has two terminals:

one NO (normally open) and one IC (isolated common).

Table 1 lists the terminal assignments for the signals of each

channel.

All of the COM terminals are connected internally and all of the

VSUP terminals are connected internally. NI does not recommend

using the VSUP and COM terminals with the cFP-RLY-421.

Table 1. Terminal Assignments

Channel

Terminal Numbers

NO IC

012

134

256

378

4 9 10

511 12

613 14

715 16

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Caution Cascading power between two modules defeats

isolation between those modules. Cascading power from

the network module defeats all isolation between

modules in the FieldPoint bank.

Connecting Loads to the cFP-RLY-421

Wire an external power supply to the load and the IC terminal of

the individual channel as shown in Figure 2. Install a 1.5 A, 250 V

maximum, fast-acting fuse suitable for the load at the IC terminal

to protect the module and the load from damage.

Figure 2. Connecting a Load

The cFP-RLY-421 has eight SPST electromechanical relays. The

power-up state is off (open) to ensure safe installation. In the ON

Table 2. VSUP and COM Terminal Assignments

VSUP COM

17 18

19 20

21 22

23 24

25 26

27 28

29 30

31 32

–

To next channel

cFP-RLY-421

V C

VSUP

COM

Sourcing

Load

1.5 A,

250 V max

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state, the NO and IC contacts connect to form a short circuit. In the

ON state, there is an effective resistance of up to 150 mΩbetween

the NO and IC terminals, which causes a voltage drop.1For

example, if the current is 1.5 A, the voltage drop across the NO

and IC terminals can be as high as 0.225 V.

The amount of current the relay can switch depends on the voltage,

the type of load, and the ambient temperature. Refer to the

Specifications section for more information.

Protecting Contacts for Inductive Loads

When an inductive load is connected to a relay, the energy stored

in the inductive load can produce a large counter-electromotive

force when the relay switches. This flyback voltage can severely

damage the relay contacts and greatly shorten the life of the relay.

It is best to limit flyback voltages by installing a flyback diode

across an inductive DC load or a metal oxide varistor (MOV)

across an inductive AC load.

The cFP-RLY-421 has internal protection MOVs to prevent

excessively high voltage from being applied across the contacts.

The MOVs are located between the NO and IC contacts of each

relay. However, National Instruments recommends installing

protection circuits across inductive loads. The flyback protection

causes a small leakage current, which is detailed in the

Specifications section.

Refer to the NI Switches Help for information about selecting and

installing contact protection circuits. Go to ni.com/manuals,

search for switches help, and select the current version of the

NI Switches Help.

Status Indicators

After you install the cFP-RLY-421 onto a backplane and apply

power to the network module, the green POWER indicator lights

and the cFP-RLY-421 informs the network module of its presence.

When the network module recognizes the cFP-RLY-421, it sends

initial configuration information to the cFP-RLY-421. After the

cFP-RLY-421 receives this initial information, the green READY

indicator lights and the module is in normal operating mode.

1 At the end of relay life, the path resistance rises rapidly above 1 Ω.

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In addition to the green POWER and READY indicators, each

channel has a numbered, green output state indicator that lights

when the channel is in the ON state.

Isolation and Safety Guidelines

Caution Read the following information before

attempting to connect the cFP-RLY-421 to any circuits

that may contain hazardous voltages.

This section describes the isolation of the cFP-RLY-421 and its

compliance with international safety standards. The field wiring

connections are isolated from the backplane and the inter-module

communication bus. The isolation barriers in the module provide

250 Vrms Measurement Category II continuous isolation, verified

by 2,300 Vrms, 5 s dielectric withstand test. The cFP-RLY-421

provides double insulation (compliant with IEC 61010-1) for

working voltages of 250 Vrms1. Safety standards (such as those

published by UL and IEC) require the use of double insulation

between hazardous voltages and any human-accessible parts or

circuits.

Never try to use any isolation product between human-accessible

parts (such as DIN rails or monitoring stations) and circuits that

can be at hazardous potentials under normal conditions, unless the

product is specifically designed for such an application, as is the

cFP-RLY-421.

Even though the cFP-RLY-421 is designed to handle applications

with hazardous potentials, follow these guidelines to ensure a safe

system:

• As with any hazardous voltage wiring, make sure that all

wiring and connections meet applicable electrical codes and

commonsense practices. Mount terminal bases and backplanes

in an area, position, or cabinet that prevents accidental or

unauthorized access to wiring that carries hazardous voltages.

•Donot use the cFP-RLY-421 as the only isolating barrier

between human contact and working voltages higher than

250 Vrms .

1 Working voltage is defined as the signal voltage plus the common-mode voltage.

Common-mode voltage is the voltage of the module with respect to ground.

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• When hazardous voltages are present on any channel, all

channels must be considered hazardous. Ensure that external

wiring and all circuits connected to the device are properly

insulated from human contact.

• Operate the cFP-RLY-421 only at or below Pollution Degree 2.

Pollution Degree 2 means that only nonconductive pollution

occurs in most cases. Occasionally, however, condensation can

cause temporary conductivity.

• You must connect the protective earth (PE) ground terminal on

the cFP-BP-xbackplane to the system safety ground. The

backplane PE ground terminal has the following symbol

stamped beside it: . Connect the backplane PE ground

terminal to the system safety ground using 14 AWG (1.6 mm)

wire with a ring lug. Use the 5/16 in. panhead screw shipped

with the backplane to secure the ring lug to the backplane PE

ground terminal.

• The cFP-RLY-421 is a UL Recognized component. The entire

Compact FieldPoint system must be installed in a UL Listed,

suitably rated NEMA or IP enclosure for safe use.

Figure 3. Installing the Compact FieldPoint System in an Enclosure

• Operate the cFP-RLY-421 at or below Measurement

Category II. Measurement Category II is for measurements

performed on circuits directly connected to the low-voltage

installation. This category refers to local-level distribution,

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such as that provided by a standard wall outlet. Do not use this

module with voltages in Measurement Categories III or IV.

Using This Product Safely

in Hazardous Locations

This product is suitable for use in U.S. and Canada: Class I,

Division 2, Groups A, B, C, D, T4 hazardous locations; and

nonhazardous locations.

Cautions Explosion hazard—Substitution of

components may impair suitability for Class I,

Division 2.

Explosion hazard—Do not disconnect equipment unless

power has been switched off or the area is known to be

nonhazardous.

Equipment must be used within its electrical and

environmental ratings. Refer to the Specifications section.

Refer to the product label for manufacturing location.

This product must be installed in an enclosure rated at least

IP 54.

Specifications

The following specifications are typical for a range of –40 to 55 °C

unless otherwise noted. All specifications are subject to change

without notice.

Relay Characteristics

Number of channels .......................... 8

Relay type ......................................... SPST, nonlatching,

normally open

Maximum switching capacity per channel (resistive load)

At 250 VAC ................................ 1.5 A at –40 to 45 °C

1.0 A at 45 to 55 °C

At 40 VDC ................................. 1.5 A at –40 to 45 °C

1.0 A at 45 to 55 °C

At 60 VDC ................................. 1.0 A

At 120 VDC ............................... 0.4 A

Minimum switching load.................. 10 mA at 5 VDC

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Maximum switching power

AC .............................................. 375 VA

DC .............................................. 60 W

DC path resistance

Initial .......................................... 150 mΩ

End of life................................... ≥1 Ω

Note DC path resistance typically remains low for

the life of the relay. At the end of relay life, the path

resistance rises rapidly above 1 Ω. Load ratings apply

to relays used within the specification before the end of

relay life.

Off-state leakage

At 250 VAC ................................ 8 µA

At 120 VDC ............................... 0.12 µA

Expected life

Mechanical ................................. 2 ×107operations min

Electrical..................................... 100,000 operations

Maximum switching frequency

Mechanical ................................. 20 operations per second

Electrical..................................... 1 operation per second at

maximum load

Relay operate time ............................ 8 ms

Relay release time............................. 4 ms

Relay bounce time ............................ 4 ms

Contact material................................ Gold-plated silver

cadmium oxide

Physical

Indicators .......................................... Green POWER and

READY indicators, 8 green

output state indicators

Weight............................................... 137 g (4.8 oz)

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