National Instruments CFP-RLY-421 User's Manual
Contents
1. Use zener diode with zener voltage about equal to power supply voltage This section has been reprinted with permission from American Zettler Inc cFP RLY 421 6 ni com 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 CR Circuits Diagram Notes ia ad Circuit A is suitable for AC or DC applications but if used with AC voltage impedance of the load should be smaller than the CR circuit s Do not utilize for timer loads as leakage current can cause faulty operations Load 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 Varistor Circuit Notes Diagram 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 National Instruments Corp cFP RLY 421 In Rush Current The2. Operating temperature 40 to 60 C Storage temperature 55 to 85 C Humidity 10 to 90 RH noncondensing Maximum altitude 2 000 m at higher altitudes the isolation voltage ratings must be lowered Pollution Degree eeeeeeeeeeeeee 2 Shock and Vibration Operating vibration random IEC 60068 2 64 ee eeeeeeeeee 10 500 Hz 5 gims Operating vibration sinusoidal IEC 60068 2 6 ee eeeeeeeeeeee 10 500 Hz 5 g Operating shock IEC 60068 2 27 cecceesceeseeseeeeeeeee 50 g 3 ms half sine 18 shocks at 6 orientations 30 g 11 ms half sine 18 shocks at 6 orientations cFP RLY 421 12 ni com Safety This product is designed to meet the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e IEC 61010 1 EN 61010 1 e UL3121 1 UL 61010C 1 e 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 senene iein EN 55011 Class A at 10 m FCC Part 15A above 1 GHz TMU a AET TE EN 61326 1997 A2 2001 Table 1 Sy Note For EMC compliance you must operate this device with shielded cabling CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE Marking as follows Low Voltage Directive safe
3. 21 22 23 24 25 26 27 28 29 30 31 32 UN 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 cFP RLY 421 4 ni com 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 Sourcing Load _I or M 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 In the ON state the NO and IC contacts connect to form a short circuit In the ON state there is an effective resistance of 100 mQ between the NO and IC terminals which causes a voltage drop For example if the current is 1 5 A the voltage drop across the NO and IC terminals is 0 15 V The amount of current the relay can switch depends on the voltage the type of load and ambient temperature Refer to the Specifications section for more information Protecting Contacts for Inductive Loads When inductive loads are connected to the relays a large counter electromotive force may occur at relay switching time because of the energy stored in the inductive loa
4. C BG patuan DOi era aeres Minimum switching load On resistance cccceeeceseeeeee A 1 5 A at 250 VAC ERR 1 5 A at 0 to 35 VDC 1 A at 55 VDC 0 4 A at 120 VDC Off state leakage 120 VDC 250 VAC Frequency Off State Leakage DC 0 12 LA 50 60 Hz 8 uA Expected life Mechanical ssesseeeessessesesssesse 20 x 10 operations min Electrical at 30 cpm 0 300 000 operations at 1 5 A Maximum switching frequency Mechanical Electricals esisiini Relays operate time 0 Relays release time Relay bounce time Contact material 00006 National Instruments Corp 35 VDC 100 000 operations at 1 5 A 250 VAC 20 operations per second 1 operation per second at maximum load saini 6 ms typical 8 ms max Tris 3 ms typical 4 ms max eae 3 ms max ES Gold plated silver cadmium oxide cFP RLY 421 Physical Indicators enteh e Green POWER and READY indicators 8 green output state indicators Weight CFP RLY 421 ossessi 130 g 4 5 oz Power Requirements Power from network module 1 700 mW Isolation Voltage Maximum isolation voltage 250 Vims Channel to channel isolation No isolation between channels Transient overvoltage ceceeeeeees 2 300 Vms Environmental FieldPoint modules are intended for indoor use only For outdoor use they must be mounted inside a sealed enclosure
5. m 101b in of torque The nylon coating on the screws prevents them from loosening cFP RLY 421 Z ni com 1 cFP I O Module 4 Screw Holes 2 Captive Screws 5 cFP Backplane 3 cFP Controller Module 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 cCFP 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 V peak 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 National Instruments Corp 3 cFP RLY 421 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 Vsyp and COM Terminal Assignments Vsup COM 17 18 19 20
6. 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 Type of Load In Rush Current Resistive load Steady state current Solenoid load 10 to 20 times the steady state current Motor load 5 to 10 times the steady state current Incandescent lamp load 10 to 15 times the steady state current 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 Status Indicators Figure 3 shows the status indicator LEDs on the cFP RLY 421 0 1 2 3 4 5 6 7 e e e e e e e e POWER READY Figure 3 Status Indicators After you insert the cFP RLY 421 into 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 In additio
7. 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 e Eight single pole single throw SPST relay channels e Switching capacity 1 5 A at 35 VDC or 250 VAC e LED relay status indicators e Hot swappable e 40 to 60 C operation e 250 Vms maximum isolation voltage e 2 300 Vms 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 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 orni com patents 323617A 01 May 2003 Minstruments 2003 National Instruments Corp All rights reserved Before you configure a FieldPoint system that use
8. ce 30 2 10 42 96 427 India 91 80 51190000 Israel 972 0 3 6393737 Italy 39 02 413091 Japan 81 3 5472 2970 Korea 82 02 3451 3400 Malaysia 603 9131 0918 Mexico 001 800 010 0793 Netherlands 31 0 348 433 466 New Zealand 64 09 914 0488 Norway 47 0 32 27 73 00 Poland 48 0 22 3390 150 Portugal 351 210 311 210 Russia 7 095 238 7139 Singapore 65 6226 5886 Slovenia 386 3 425 4200 South Africa 27 0 11 805 8197 Spain 34 91 640 0085 Sweden 46 0 8 587 895 00 Switzerland 41 56 200 51 51 Taiwan 886 2 2528 7227 Thailand 662 992 7519 United Kingdom 44 0 1635 523545 cFP RLY 421 14 ni com
9. d 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 National Instruments Corp 5 cFP RLY 421 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 Guidelines for Selecting Contact Protection Circuits 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 Typically contact protection circuits are provided for an overview but you should thoroughly examine the circuit you are planning to use Diode and Zener Diode Circuit Diagram Notes Use in DC applications only eo c Use when diode circuit causes too long release time
10. d 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 total system e The cFP RLY 421 has a safety isolation barrier between the T 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 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 National Instruments Corp 9 cFP RLY 421 e 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 e 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 panhead screw shipped with the backplane to secure the ring lug to the backplane PE ground terminal e As with any hazardous voltage wiring make sure that all wiring and connections meet applicabl
11. e 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 e The isolation of the cFP RLY 421 is certified as double insulated for working voltages of 250 Vms Do not use the cFP RLY 421 as the only isolating barrier between human contact and working voltages of more than 250 Vms e 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 a temporary conductivity caused by condensation must be expected e 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 e Operate the cFP RLY 421 at or below Installation Category II Installation Category II is for measurements performed on circuits directly connected to the low voltage installation This category refers to local level distribution such as that provided by a standard wall outlet cFP RLY 421 10 ni com Specifications The following specifications are typical for a range of 40 to 60 C unless otherwise noted Relay Characteristics Number of channels Relay type aias 8 1 SPST nonlatching Maximum switching capacity resistive load 40 to 60
12. n 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 cFP RLY 421 8 ni com 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 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 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 Vims The cFP RLY 421 provides double insulation compliant with IEC 61010 1 for working voltages of 250 Vims 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 designe
13. s a cCFP 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 Suppose you have a bank with a cFP 2000 network module four cCFP RLY 421 modules and four cFP DI 301 modules The cFP 2000 can supply up to 9 W The cFP RLY 421 requires 1 7 W and cFP DI 301 requires 0 325 W The four cFP RLY 421 and four cFP DI 301 modules require a total of 8 1 W 4x1 7W 4x0 325 W 8 1 W This configuration meets the 9 W power requirement 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 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 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
14. ty 73 23 EEC Electromagnetic Compatibility Directive EMC cccecsseeseeseeeneees 89 336 EEC 3 Note Refer to the Declaration of Conformity DoC for this product for any additional regulatory compliance information To obtain the DoC for this product click Declarations of Conformity Information at ni com hardref nsf National Instruments Corp 13 cFP RLY 421 Where to Go for Support For more information about setting up the FieldPoint system refer to these National Instruments documents e FieldPoint network module user manual e 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 com ask and follow the calling instructions or dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 02 612 9672 8846 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 Brazil 55 11 3262 3599 Canada Calgary 403 274 9391 Canada Montreal 514 288 5722 Canada Ottawa 613 233 5949 Canada Qu bec 514 694 8521 Canada Toronto 905 785 0085 Canada Vancouver 514 685 7530 China 86 21 6555 7838 Czech Republic 420 2 2423 5774 Denmark 45 45 76 26 00 Finland 385 0 9 725 725 11 France 33 0 1 48 14 24 24 Germany 49 0 89 741 31 30 Gree
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