Adlink PCI-7256 Manual do Utilizador descarregar pdf (Página 46)

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Appendix A Relay Contact Protection Circuits

Device Selection:

Use a zener diode with a zener voltage about the same as the power supply

voltage.

4. Varistor Circuit

This circuit is also suitable for both AC & DC applications. Using the stable

voltage characteristics of the varistor, this circuit prevents excessively high

voltages from being applied across the contacts. This circuit also slightly

delays the release time. Effective when connected to both contacts of the

power supply voltage is 24 or 48V and the voltage across the load is 100 to

200 V.

Contact

Inductive

Load

Diode

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Adlink PCI-7256 Manual do Utilizador Página 46