cFP-RLY-423 Operating Instructions
Contents
1. The following specifications are typical for the range 40 to 60 C unless otherwise noted Relay Characteristics Number of channels cceeeeeeee 4 Relay ty Pe amp cescesssceeccntesisspevceadeseontesees 1 Form C SPDT nonlatching Maximum switching capacity resistive load 20 mVAC to 250 VAC wu 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 wee 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 t039 VDE sites totonu eee 1 A at 40 to 55 C 0 5 A at 55 to 60 C 55 to 120 VDC virens 0 4 A Minimum switching load 100 mA at 5 VDC DC path resistance Initial 200 MQ End of life eeeeeeseeeeseeeres 21 0 Q cFP RLY 423 10 ni com Note DC path resistance typically remains low for Ay the life of the relay At the end of relay life the path resistance rises rapidly above 1 Q Load ratings apply to relays used within the specification before the end of relay life Off state leakage 120 VDC 250 VAC Frequency Off State Leakage DC 0 12 pA 50 60 Hz 8 uA Expected life Mechanical eccecceeeeeeeeeeeee 2 x 107 operations min Electrical isseire 1 x 10 operations at rated resistive load Maximum switching frequency Mechanical 20 operations per second Electrical ci csscssisscsecsevengeseveceetsoces 1 operation per second at maximum load Relay operate time 0 0 0 eee lt 13 ms Relay release time2. 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 Q National Instruments Corp 5 cFP RLY 423 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 contac
3. 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 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 V C r O QO fesses tees i NO Sourcing e i l T Load ae sa EIO l IC 250 V max AC Q N i I NC Sourcing iy Load A VSUP 1COM cFP RLY 423 0 C S i Figure 2 Basic Field Connection cFP RLY 423 4 ni com 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 mQ between IC and NC or NO This resistance causes a voltage drop For 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
4. C Part 15 Class A Compliant EMUSSIONS c cccccesseeccesssseeeeessaeeees EN 55011 Class A at 10 m FCC Part 15A above GHz TAMU Ynnn EN 61326 1997 A2 2001 Table 1 3 Note For EMC compliance you must operate this device with shielded cabling cFP RLY 423 12 ni com CE Compliance This product meets the essential requirements of applicable European Directives as amended for CE marking as follows Low Voltage Directive safety 73 23 EEC Electromagnetic Compatibility Directive EMC se 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 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 support and follow the calling instructions or dial 512 795 8248 For telephone support outside the United States contact your local branch office Australia 1800 300 800 Austria 43 0 662 45 79 90 0 Belgium 32 0 2 757 00 20 B
5. 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 e Four single pole double throw SPDT relay channels e Switches up to 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 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 7 NATIONAL INSTRUMENTS 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 cCFP 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 Ib in of torque The nylon coating on the screws prevent
6. ___NC NO___NC 00 ee e 2 e 30 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 Vms The cFP RLY 423 provides double insulation compliant with IEC 61010 1 for working voltages of cFP RLY 423 8 ni com 250 Vims Safety standards such as those published by UL and IEC require the use of double insulation between hazardous voltage
7. eee lt 13 ms Relay bounce time 0 0 eee lt 6 ms Contact material eee Silver cadmium oxide Physical INGICAIONS eeina Green POWER and READY indicators 8 green output state indicators WEIGH oa e ioesssaravsunsastvedsesesssneisienis sees 142 g 5 0 oz Power Requirements Power from network module 1 2 W at 25 to 60 C 1 5 W at 40 to 25 C National Instruments Corp 11 cFP RLY 423 Isolation Voltage Maximum isolation voltage 250 Vms Installation Category II Channel to channel isolation No isolation between channels Transient Overvoltage cesses 2 300 Vms Environmental FieldPoint modules are intended for indoor use only For outdoor use they must be mounted inside a sealed enclosure Operating temperature 40 to 60 C Storage temperature 55 to 85 C HUMidity 2 ciessscatisdscstiacaies iess 10 to 85 RH noncondensing Maximum altitude ccceeeeees 2 000 m at higher altitudes the isolation voltage ratings must be lowered Pollution Degree s e 2 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 FC
8. erved I 323605B 01 Jul03
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10. s them from loosening d eS 1 cFP I O Module 4 Screw Holes 2 Captive Screws 5 cFP Backplane 3 cFP Controller Module Figure 1 Installing the cFP RLY 423 cFP RLY 423 2 ni com Wiring the cFP RLY 423 The cFP CB x connector 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 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 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 Table 1 Terminal Assignments Terminal Numbers Channel NO IC NC 0 1 2 3 4 1 5 6 7 8 2 9 10 11 12 3 13 14 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 423 National Instruments Corp cFP RLY 423 Table 2 Vsyp and COM Terminal Assignments Vsup COM 17 18 19 20 21 22 23 24 25 26 27 28 29
11. s 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 e The cFP RLY 423 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 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
12. t 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 Diagram Notes Use in DC applications only Use when diode circuit causes too long release time Load Use zener diode with zener voltage about equal to power supply voltage 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 Load 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 This section has been reprinted with permission from American Zettler Inc cFP RLY 423 6 ni com CR RC or Snubber Circuits Diagram Notes Circuit A is suitable for AC or DC applications but if used with AC voltage impedance of the load 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 Tf the load is a relay or solenoid release times lengthen Effective TE Load when connected to both contacts A power s
13. upply voltage across the load is 100 to 200 V Varistor Circuit 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 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 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 National Instruments Corp 7 cFP RLY 423 Table 3 Typical Load Types and In Rush Currents Continued Type of Load In Rush 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 423 POWER READY NO___NC NO NC NO
14. 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 e The isolation of the cFP RLY 423 is certified as double insulated for working voltages of 250 Vms Do not use the cFP RLY 423 as the only isolating barrier between human contact and working voltages of more than 250 Vms 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 National Instruments Corp 9 cFP RLY 423 e 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 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 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
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