National Instruments CFP-RLY-421 用户手册

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页码 14
© 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