SPU Precharge Kit and Devices

The precharge kit is available as a single or inserted unit inside the Capacitor Bank in the case of a solution with hold-up capacitors on the DC link.
They essentially consist of an insertion system by means of contactors, limiting resistors and a rectifying group suitably protected by High-Speed fuses, between the network and the capacitor bank of the DC link which can be constituted by the capacitors of the capacitor bank group or by the hold-up capacitors present in each market Inverter.
They are available with similar dimensions and weights for 400V and 690V three-phase networks and can be used for groups of capacitors up to 150,000F.

The following images show two typical applications for the precharge unit (respectively for the DC/AC Inverter and the AC/AC Inverter).