NI FieldPoint cFP-RLY-423 Manuel utilisateur

FieldPoint™Operating Instructions

cFP-RLY-423

Four-Channel SPDT Relay Module

These operating instructions describe how to install and use the

National Instruments cFP-RLY-423. For more information about

configuring and accessing the cFP-RLY-423 over a network, refer

to the user manual for the FieldPoint network module you are

using.

Features

The cFP-RLY-423 is a Compact FieldPoint relay output module

with the following features:

• Four single-pole double-throw (SPDT) relay channels

• Switches up to 1.5 A at 35 VDC or 250 VAC

• LED relay status indicators

• Hot swappable

• –40 to 60 °C operation

•250V

rms maximum isolation voltage

• 2,300 Vrms transient overvoltage protection

Installing the cFP-RLY-423

The cFP-RLY-423 mounts on a Compact FieldPoint backplane

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

Installing the cFP-RLY-423 onto a powered backplane does not

disrupt the operation of the bank.

cFP-RLY-423 2 ni.com

To install the cFP-RLY-423, refer to Figure 1 and complete the

following steps:

1. Align the captive screws on the cFP-RLY-423 with the holes

on the backplane. The alignment keys on the cFP-RLY-423

prevent backward insertion.

2. Press firmly to seat the cFP-RLY-423 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-423

1 cFP I/O Module

2 Captive Screws

3 cFP Controller Module

4 Screw Holes

5 cFP Backplane

3 5

Wiring the cFP-RLY-423

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

cFP-RLY-423 relay channels and for an external supply to power

field devices. If you are using the cFP-RLY-423 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-423 has four terminals:

one NO (normally open), one NC (normally closed), and

two 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 them with the cFP-RLY-423.

Table 1. Terminal Assignments

Channel

Terminal Numbers

NO IC NC

0 1 2,3 4

1 5 6,7 8

2 9 10,11 12

3 13 14,15 16

cFP-RLY-423 4 ni.com

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-423

Connect two loads and an external power supply to one channel

of the cFP-RLY-423 as shown in Figure 2. Install a 1.5 A, 250 V

maximum, fast-acting fuse suitable for the load at the connected

IC terminal to protect the module and the load from damage.

Figure 2. Basic Field Connection

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

cFP-RLY-423

COM

VSUP

–

Sourcing

Load

1.5 A,

250 V max

Sourcing

Load

The cFP-RLY-423 has four independent Form C electromechanical

relays. The relays are break-before-make. At power-up, all relays

are in the NC state. Turning the relay channel on breaks the NC–IC

connection and makes the NO–IC connection. Each relay can be

controlled independently, or all relays can change states

simultaneously.

There is an effective resistance of up to 200 mΩbetween IC and

NC or NO. This resistance causes a voltage drop.1For example, if

the current is 1.5 A, the voltage drop across the IC and NC or NO

terminals can be as high as 0.3 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 from Inductive Loads

When inductive loads are connected to the relays, a large

counter-electromotive force can occur at relay switching time

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

voltages 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. Refer to the Guidelines for Selecting

Contact Protection Circuits section for more information.

In addition, the cFP-RLY-423 has internal protection MOVs to

prevent excessively high voltage from being applied across the

contacts. Each channel contains two MOVs: one between NC and

IC and one between NO and IC. However, National Instruments

recommends installing a protection circuit across any inductive

load, as close as possible to the load. The flyback protection MOVs

cause a small leakage current, which is detailed in the

Specifications section.

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

cFP-RLY-423 6 ni.com

Guidelines for Selecting Contact

Protection Circuits1

Proper selection is critical as the use of a contact-protection device

can extend contact life. When mounting the protection device,

always locate it near the immediate area of the load or contact.

Typically you should mount a protective device within 18 in. of

the load or contact.

Typical contact-protection circuits are shown here as an overview,

but you should thoroughly examine the circuit you are planning

to use.

Diode and Zener Diode Circuit

Diode Circuit

1 This section has been reprinted with permission from American Zettler, Inc.

Diagram Notes

Use in DC applications only.

Use when diode circuit causes too long

release time.

Use zener diode with zener voltage about

equal to power supply voltage.

Diagram Notes

Use in DC applications only.

Compared to RC type, circuit delays release

time (2 to 5 times values stated in catalog).

For larger voltages, use diode with reverse

breakdown 10 times circuit voltage and

forward load circuit.

For smaller voltages, use reverse breakdown

voltage of 2 to 3 times power supply voltage.

Load

CR (RC or Snubber) Circuits

Varistor Circuit

In-Rush Current

The type of load and its in-rush current characteristics, together

with switching frequency, can cause contact welding. For loads

with in-rush current, measure the steady state current and in-rush

current to determine the proper relay. Some typical types of loads

and the in-rush current they create are summarized in Table 3.

Diagram Notes

Circuit A is suitable for AC or

DC applications, but if used with

AC voltage, impedance of the load

should be smaller than that of the

CR circuit. Do not utilize for timer

loads, as leakage current can cause

faulty operations.

Circuit B is suitable for AC or DC.

If the load is a relay or solenoid,

release times lengthen. Effective

when connected to both contacts,

power supply voltage across the

load is 100 to 200 V.

Diagram Notes

Effective for AC and DC

applications.

Circuit slightly delays release time.

Effective when connected to both

contacts, power supply voltage

across the load is 100 to 200 V.

Table 3. Typical Load Types and In-Rush Currents

Type of Load In-Rush Current

Resistive load Steady-state current

Motor load 5 to 10 times the steady-state current

Incandescent lamp load 10 to 15 times the steady-state current

Load

cFP-RLY-423 8 ni.com

Status Indicators

Figure 3 shows the status indicator LEDs on the cFP-RLY-423.

Figure 3. Status Indicators

After you insert the cFP-RLY-423 into a backplane and apply

power to the network module, the green POWER indicator lights

and the cFP-RLY-423 informs the network module of its presence.

When the network module recognizes the cFP-RLY-423, it sends

initial configuration information to the cFP-RLY-423. After the

cFP-RLY-423 receives this initial information, the green READY

indicator lights and the module is in normal operating mode.

In addition to the green POWER and READY indicators, each

channel has two green output state indicators labeled NO and NC.

These indicators show which terminal is connected to IC.

Isolation and Safety Guidelines

Caution Read the following information before

attempting to connect the cFP-RLY-423 to any circuits

that may contain hazardous voltages.

This section describes the isolation of the cFP-RLY-423 and its

compliance with international safety standards. The field wiring

connections are isolated from the backplane. The isolation is

provided by the module, which has optical and galvanic isolation

barriers designed and tested to protect against transient fault

voltages of up to 2,300 Vrms. The cFP-RLY-423 provides double

insulation (compliant with IEC 61010-1) for working voltages of

Mercury lamp load Approximately 3 times the steady-state

current

Sodium vapor lamp load 1 to 3 times the steady-state current

Capacitive load 20 to 40 times the steady-state current

Transformer load 5 to 15 times the steady-state current

Table 3. Typical Load Types and In-Rush Currents (Continued)

Type of Load In-Rush Current

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-423.

Even though the cFP-RLY-423 is designed to handle applications

with hazardous potentials, follow these guidelines to ensure a safe

total system:

• The cFP-RLY-423 has a safety isolation barrier between the

I/O channels and the inter-module communication bus. There

is no isolation between channels unless otherwise noted. If any

of the channels on a module are wired at a hazardous potential,

make sure that all other devices or circuits connected to that

module are properly insulated from human contact.

•Donot share the external supply voltages (the V and C

terminals) with other devices (including other FieldPoint

devices), unless those devices are isolated from human contact.

• 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.

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

wiring and connections meet applicable electrical codes

and commonsense practices. Mount backplanes in an area,

position, or cabinet that prevents accidental or unauthorized

access to wiring that carries hazardous voltages.

• The isolation of the cFP-RLY-423 is certified as

double-insulated for working voltages of 250 Vrms. Do not use

the cFP-RLY-423 as the only isolating barrier between human

contact and working voltages of more 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.

cFP-RLY-423 10 ni.com

• Operate the cFP-RLY-423 only at or below Pollution Degree 2.

Pollution Degree 2 means that only nonconductive pollution

occurs in most cases. Occasionally, however, a temporary

conductivity caused by condensation must be expected.

•Donot operate FieldPoint products in an explosive atmosphere

or where there may be flammable gases or fumes. If you need

to operate FieldPoint products in such an environment, the

FieldPoint products must be in a suitably rated enclosure.

• Operate the cFP-RLY-423 at or below Installation Category II.

Installation Category II is for measurements performed on

circuits directly connected to the electrical distribution system.

This category refers to local-level distribution, such as that

provided by a standard wall outlet.

Specifications

The following specifications are typical for the range –40 to 60 °C

unless otherwise noted.

Relay Characteristics

Number of channels.......................... 4

Relay type ......................................... 1 Form C (SPDT),

nonlatching

Maximum switching capacity (resistive load)

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

1.0 A at 45 to 55 °C

0.5 A at 55 to 60 °C

0 to 35 VDC ...............................1.5 A at –40 to 45 °C

1.0 A at 45 to 55 °C

0.5 A at 55 to 60 °C

35 to 55 VDC .............................1 A at –40 to 55 °C

0.5 A at 55 to 60 °C

55 to 120 VDC ...........................0.4 A

Minimum switching load..................100 mA at 5 VDC

DC path resistance

Initial .......................................... ≤200 mΩ

End of life................................... ≥1.0 Ω

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