National Instruments CFP-RLY-421 User Manual download pdf (Page 7)

© National Instruments Corp. 7 cFP-RLY-421

Diode Circuit

CR Circuits

Varistor 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.

For smaller voltages, use reverse breakdown

voltage of 2 to 3 times power supply voltage.

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

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

Load

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