Reversible motor inductive loads

Whilst reversible motors are energized they store energy, when switched off the stored energy must be safely discharged. Unless the connected load specifically states that it includes internal flyback/freewheel diodes then external diodes must be fitted.

Inductive loadsFlyback/freewheel diode

Note

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

Diode requirements:

  • DC blocking voltage VRM ≥ 60 V

  • Average rectified output current IO ≥ Load current amps

  • Forward voltage drop > 1 V @ load current

Important

When connecting the diodes ensure that:

  • A diode is placed directly before and after 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.

  • The diodes are connected to the power supply negative (-) terminal.