Measurement-computing 6K-ERB08 Manuel d'utilisateur télécharger pdf (Page 23)

6K-ERB08 User's Guide Functional Details

Relay contact protection circuit for inductive loads

When you connect an inductive load to a relay, energy stored in the inductive load can induce a large voltage

surge when you switch the relay. This voltage can severely damage the relay contacts. To limit the voltage

surge across the inductive load, install a kickback diode across the DC load. Refer to the contact protection

circuit in . For AC loads, install a metal oxide varistor (MOV). Figure 3-5

Figure 3-5. Relay contact protection circuit

Inductive

Load

Kickback

Diode

Relay

3-4

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Measurement-computing 6K-ERB08 Manuel d'utilisateur Page 23