Inductive loads

Whilst inductive loads such as motors, relays and solenoids etc. are energized they store energy, when switched off the stored energy must be safely discharged. Unless the connected load specifically states that it includes an internal flyback/freewheel diode then an external diode must be fitted.

Inductive loadsFlyback/freewheel diode

Note

Failure to fit the diode will result in permanent damage to the module.

Important

When connecting the diode ensure that:

  • The diode is placed directly across the load

  • The wire length is kept to an absolute minimum.

  • The wire gauge is the same as the wire gauge used for the load.

Diode requirements:

  • DC blocking voltage VRM ≥ 60 V

  • Average rectified output current IO ≥ Load current amps

  • Forward voltage drop > 1 V @ load current