Product Description:

The PSI6300.624L1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. Its role in automation is to convert three-phase utility power into a regulated medium-frequency output that can drive induction heating coils, welding transformers, or other equipment requiring tight current control. The device resides in a ventilated cabinet and uses forced air movement to evacuate internal heat generated by the power electronics.

Input compatibility spans a line voltage of 400-480 V AC at the standard 50/60 Hz mains frequency. Under rated conditions the inverter conducts a nominal output current of 110 A, while the primary bus can tolerate momentary draws up to 800 A during start-up or load transients. Pulse-width modulation is performed at a carrier of 1 kHz, producing the medium-frequency waveform needed by downstream equipment without excessive switching loss. Control logic is sustained by a separate 24 VDC supply, and an internal auxiliary rail can source 2 A for sensors or contactors. Environmental ingress protection is limited to IP20, so the unit must be installed in a clean electrical enclosure with no direct dust or liquid exposure.

Thermal performance is managed by an air-cooling path that dissipates a basic cabinet loss of 69 W and handles a maximum cooling loss of 360 W when the drive is fully loaded. For safe wiring, the design specifies a minimum cable cross-section of 35 mm², a guideline that reflects the feeder capacity required to carry the maximum secondary current of 36 kA delivered by the output transformer stage. Operation is permissible up to an ambient temperature of 55 °C; beyond this point derating or external climate control is necessary. Additional integration features include DeviceNet timer support for coordinated sequencing and a logic-level interlock that disconnects the 24 V rail when mains power is absent.