National Instruments FP-RLY-422 Operating Instructions Manual Download Page 4 | Manualshive

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National Instruments FP-RLY-422 Operating Instructions Manual Download Page 4

FP-RLY-422

4

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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

Ω

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

V

sup

I.Com

N.Closed

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Summary of Contents for FP-RLY-422

Page 1: ... 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 ope...

Page 2: ...llation 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 ...

Page 3: ...igure 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 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 ...

Page 4: ...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 mΩ between I Com and N Closed or N Open This resistance will cause a voltage drop For example if the current is 3 A ...

Page 5: ...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 ...

Page 6: ...xamine 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 de...

Page 7: ...e 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 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 l...

Page 8: ...ion 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 steady state current Motor load 5 to 10 times the stead...

Page 9: ...ulation 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 that 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 RL...

Page 10: ...ecifications The following specifications are typical for the range 40 to 70 C unless otherwise noted Input Characteristics 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 mΩ Off state leakage 0 3 µA at 250 VA...

Page 11: ... 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 cat...

Page 12: ...l 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 19 ...

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