Manual - National Instruments
Contents
1. Green POWER and READY indicators 8 green output state indicators Weight 182 g 6 4 oz Power Requirements Power from network module 1000 mW Environment Operating temperature 40 to 70 C Storage temperature 55 to 100 C Relative humidity 5 to 90 noncondensing CE Mark Compliance This product meets applicable EU directive s as follows Safety isolation EN 61010 double insulation for 250 Vrms working isolation installation category II EMC Directive Immunity EN 50082 1 1994 Emissions EN 55011 1991 Group I Class A at 10 m Mechanical Dimensions Figure 6 shows the mechanical dimensions of the FP RLY 422 installed onto a terminal base Dimensions are given in inches millimeters Figure 6 Mechanical Dimensions 4 31 109 5 3 60 91 44 4 22 107 192. or 35 VDC To switch greater DC voltages refer to Figure 4 Figure 4 Maximum Current vs DC Volts Contact Protection 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 load These flyback voltages can severely damage the relay contacts and greatly shorten the life of the relay It is best to limit these flyback voltages at your inductive load by installing across your inductive load a flyback diode for DC loads or a metal oxide varistor MOV for AC loads Refer to the next section Guidelines for Selecting Contact Protection Circuits for more information In addition the FP RLY 422 contains its own internal protection MOV to prevent excessively high voltage from being applied across the contacts Each channel contains two MOVs one between N Closed and I Com and one between N Open and I Com However National Instruments still recommends the use of a protection circuit across your inductive load 20 0 40 60 DC Volts Current Amps 80 100 120 5 1 1 5 2 2 5 3 Safe Operating Region FP RLY 422 6 www natinst 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
3. 28 3 13 14 15 16 29 30 31 32 a Total Current Less Than 5 Amps b Total Current Greater Than 5 Amps V C Vsup N Open I Com I Com Vsup N Closed COM Load Load N Closed I Com N Open I Com Load Load FP RLY 422 4 www natinst com Relay Output Circuit The outputs of the FP RLY 422 consist of four independent Form C electromechanical relays The relays are break before make but only if you do not exceed the specified relay operation speed All relays remain in their power up state or OFF state N Closed connected to I Com until the relay Channel is turned on This will break the N Closed I Com connection and connect I Com to N Open Choose the impedance of the loads so that the current switched by any one channel is no more than 3 A Each relay can be controlled separately without affecting the others or all relays can change states at the same time There is an effective resistance of 100 m between I Com and N Closed or N Open This resistance will cause a voltage drop For example if the current is 3 A the voltage drop across the I Com and N Closed or N Open terminals is 0 3 V Figure 3 shows the diagram of one channel s relay output circuit Figure 3 Relay Output Circuit N Open I Com COM C V Vsup I Com N Closed National Instruments Corp 5 FP RLY 422 The maximum switching capacity of each relay is 3 A up to 250 VAC
4. FieldPoint is a trademark of National Instruments Corporation Product and company names mentioned herein are trademarks or trade names of their respective companies 322450A 01 Copyright 1999 National Instruments Corp All rights reserved September 1999 OPERATING INSTRUCTIONS FP RLY 422 4 Channel SPDT Relay Module These operating instructions describe the installation features and characteristics of the FP RLY 422 For details on configuring and accessing the FP RLY 422 over a network refer to the user manual for the particular FieldPoint network module you are using with the FP RLY 422 Features The FP RLY 422 is a FieldPoint relay output module with the following features Four Single Pole Double Throw SPDT relay channels Switching capacity 3 A at 35 VDC or 250 VAC On Off LED indicators Hot plug and play operation 3 000 V input to output isolation Double insulated for 250 V safe working voltage 40 to 70 C operation Installation The FP RLY 422 mounts on a FieldPoint terminal base FP TB xx unit The hot plug and play operation of the FP RLY 422 allows you to install it onto a powered terminal base without disturbing the operation of other modules or terminal bases The FP RLY 422 receives operating power from the terminal base FP RLY 422 2 www natinst com To install the FP RLY 422 refer to Figure 1 and follow these steps 1 Slide the terminal b
5. 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 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 Load National Instruments Corp 7 FP RLY 422 CR 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 the following table Diagram Notes Circuit A is suitable for AC or DC applications but if used with AC voltage impedance of the load should be smaller th
6. ady 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 4 Ch SPDT Relay 0 1 2 3 NO NC NO NC NO NC NO NC National Instruments Corp 9 FP RLY 422 NO and NC The indicators show which terminal is connected to I Com Isolation and Safety Guidelines Caution Read the following information before attempting to connect ANY circuits that may contain hazardous voltages to the FP RLY 422 This section describes the isolation of the FP RLY 422 and its compliance with international safety standards The outputs are isolated from the backplane of the terminal base with an isolation barrier designed and tested to protect against fault voltages of up to 3000 Vrms In addition the FP RLY 422 provides double insulation compliant to UL and IEC safety standards for working common mode voltages of 250 Vrms 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 You should never attempt to use any isolation product between human accessible parts such as DIN rails or monitoring stations and circuits th
7. an the CR circuit s 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 Load Load Load FP RLY 422 8 www natinst com Status Indicators Figure 5 shows the module label and status indicators You can remove the insertable label to see wiring diagrams for the relay channels Figure 5 Status Indicators and Module Label After the module has been inserted into a terminal base and power is applied the green POWER indicator lights and the FP RLY 422 informs the network module of its presence When the network module recognizes the FP RLY 422 the network module sends initial configuration information to the FP RLY 422 After receiving this initial information the green READY indicator lights and the FP RLY 422 is in its normal operating mode In addition to the green POWER and READY indicators each channel has two green output state indicators labeled Table 2 Typical Load Types and In Rush Currents Type of Load In Rush Current Resistive load Steady state current Solenoid load 10 to 20 times the ste
8. ase key to either position X used for any module or position 7 used for the FP RLY 422 module 2 Align the FP RLY 422 alignment slots with the guide rails on the terminal base 3 Press firmly to seat the FP RLY 422 on the terminal base The terminal base latch locks the FP RLY 422 into place when it is firmly seated Figure 1 Module Installation Diagram Field Wiring The terminal base has connections for each of the four relay channels and an external supply to power field devices Each relay channel of the FP RLY 422 has four terminals one N Open Normally Open two I Com Isolated Common and one N Closed Normally Closed The external supply is not needed for the internal operation of the FP RLY 422 however you may connect an external supply to power field devices by connecting to the V and C terminals of the terminal base If you connect an external supply to the V and C terminals the total current supplied cannot exceed 5 A Alignment Slot Key Latch Guide Rails Terminal Base I O Module National Instruments Corp 3 FP RLY 422 Table 1 lists the terminal assignments for the signals of each channel Figures 2a and 2b show examples of basic wiring connections Figure 2 Basic Field Connection Table 1 Terminal Assignments Channel Terminal Numbers N Open I Com N Closed VSUP COM 0 1 2 3 4 17 18 19 20 1 5 6 7 8 21 22 23 24 2 9 10 11 12 25 26 27
9. at may be at hazardous potentials under normal conditions unless the product is specifically designed as the FP RLY 422 is for such an application Even when a product like the FP RLY 422 is used in applications with hazardous potentials follow these guidelines to ensure a safe total system The safety isolation of the FP RLY 422 is from input to output not between channels on the same module If any of the channels on a module are wired at a hazardous potential ensure that all other devices or circuits connected to that module are properly insulated from human contact Do not share the external supply voltages V and C on the terminal base with other devices including other FieldPoint devices unless those devices are also isolated from human contact FP RLY 422 10 www natinst com As with any hazardous voltage wiring ensure that all wiring and connections meet with applicable electrical codes or common sense practices Mount terminal bases in an area position or cabinet that prevents accidental or unauthorized access to wiring with hazardous voltages The isolation of the FP RLY 422 is certified as double insulated for normal operating voltages of 250 Vrms Do not use the FP RLY 422 as the sole isolating barrier between human contact and working voltages of more than 250 Vrms Specifications The following specifications are typical for the range 40 to 70 C unless otherwise noted Input Cha
10. racteristics Number of channels 4 Relay type 1 Form C SPDT Nonlatching Maximum Switching Capacity Resistive Load AC 3 A at 250 VAC DC 3 A at 35 VDC 2 A at 40 VDC 1 A at 55 VDC 0 4 A at 120 VDC Minimum switching voltage 10 mA at 5 VDC On resistance 100 m Off state leakage 0 3 A at 250 VAC Expected Life Mechanical 10 106 operations min Electrical at 30 cpm 300 000 operations at 3 A 35 VDC 100 000 operations at 3 A 250 VAC Maximum Switching Frequency Mechanical 20 operations per second Electrical 1 operation per second at maximum load Relays operate time 10 ms typical 13 ms max Relays release time 5 ms typical 7 ms max National Instruments Corp 11 FP RLY 422 Relay bounce time 3 ms typical 6 ms max Contact material Silver cadmium oxide Isolation CH GND and CH CH 3 000 Vrms Safety Isolation Working Voltage CH GND only 250 Vrms designed per IEC 1010 as double insulated Physical Indicators
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