Electronic Accessory User Manual

ManualsBrandsNational Instruments ManualsOtherCFP-RLY-421

323617A-01 May 2003

FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation.

Product and company names mentioned herein are trademarks or trade names of their respective companies.

For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,

the

patents.txt file on your CD, or ni.com/patents.

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. For details on

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

• Switching capacity 1.5 A at 35 VDC or 250 VAC

• LED relay status indicators

• Hot swappable

• –40 to 60 °C operation

• 250 V

rms

maximum isolation voltage

• 2,300 V

rms

transient overvoltage protection

Power Requirement

The cFP-RLY-421 is powered by the FieldPoint network module

through the backplane bus. The cFP-RLY-421 is a high-power

consumption module, which may limit the number of I/O modules

that you can connect to a single network module.

Summary of content (14 pages)

PAGE 1
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. For details on configuring and accessing the cFP-RLY-421 over a network, refer to the user manual for the FieldPoint network module you are using.
PAGE 2
Before you configure a FieldPoint system that uses a cFP-RLY-421 module, calculate the total power consumption of the I/O modules on the FieldPoint bank. You can find the power requirement specification in the operating instructions for each I/O module. The maximum power the network module can supply is specified in the network module user manual. Make sure the total power requirement for all of the I/O modules in the bank is less than the maximum power available from the network module.
PAGE 3
5 2 1 4 5 4 3 1 cFP I/O Module 2 Captive Screws 3 cFP Controller Module 4 Screw Holes 5 cFP Backplane Figure 1. Installing the cFP-RLY-421 Wiring the cFP-RLY-421 The cFP-CB-x connector 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.
PAGE 4
Table 1 lists the terminal assignments for the signals of each channel. Table 1. Terminal Assignments Terminal Numbers Channel NO IC 0 1 2 1 3 4 2 5 6 3 7 8 4 9 10 5 11 12 6 13 14 7 15 16 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-421. Table 2.
PAGE 5
Connecting Loads to the cFP-RLY-421 Wire an external power supply to the load and IC terminal of the individual channel as shown in Figure 2. This method of wiring keeps the electrical connections of the cFP-RLY-421 within safe current limits. V C VSUP NO Sourcing Load IC + or – AC COM To next channel cFP-RLY-421 Figure 2. Connecting a Load The cFP-RLY-421 has eight SPST (Single-Pole-Single-Throw) electromechanical relays. The power-up state is off (open) to ensure safe installation.
PAGE 6
In addition, 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 still recommends the use of a protection circuit across an inductive load. The flyback protection causes a small leakage current, which is detailed in the Specifications section.
PAGE 7
Diode Circuit 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. Load For smaller voltages, use reverse breakdown voltage of 2 to 3 times power supply voltage.
PAGE 8
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 the following chart.
PAGE 9
Upgrading the FieldPoint Firmware You may need to upgrade the FieldPoint firmware when you add new I/O modules to the FieldPoint system. For information on determining which firmware you need and how to upgrade the firmware, go to ni.com/info and enter fpmatrix. Isolation and Safety Guidelines Read the following information before attempting to connect the cFP-RLY-421 to any circuits that may contain hazardous voltages.
PAGE 10
• Do not 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-x backplane 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.
PAGE 11
Specifications The following specifications are typical for a range of –40 to 60 °C unless otherwise noted. Relay Characteristics Number of channels.......................... 8 Relay type ......................................... 1 SPST, nonlatching Maximum switching capacity (resistive load) –40 to 60 °C AC ........................................ 1.5 A at 250 VAC DC........................................ 1.5 A at 0 to 35 VDC 1 A at 55 VDC 0.4 A at 120 VDC Minimum switching load..................
PAGE 12
Physical Indicators .......................................... Green POWER and READY indicators, 8 green output state indicators Weight cFP-RLY-421.............................. 130 g (4.5 oz) Power Requirements Power from network module ............ 1,700 mW Isolation Voltage Maximum isolation voltage .............. 250 Vrms Channel-to-channel isolation ............ No isolation between channels Transient overvoltage........................
PAGE 13
Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 3121-1, UL 61010C-1 • CAN/CSA C22.2 No. 1010.1 For UL, hazardous location, and other safety certifications, refer to the product label or to ni.com. Electromagnetic Compatibility CE, C-Tick, and FCC Part 15 (Class A) Compliant Emissions..........................................
PAGE 14
Where to Go for Support For more information about setting up the FieldPoint system, refer to these National Instruments documents: • FieldPoint network module user manual • Other FieldPoint I/O module operating instructions • FieldPoint connector block operating instructions Go to ni.com/support for the most current manuals, examples, and troubleshooting information. For telephone support in the United States, create your service request at ni.