Product Description:

The PSI6300.353-L1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. In a production cell, it supplies regulated, high-current AC to induction heaters, weld transformers, or similar loads. It links the plant’s low-frequency mains to processes that need stable kilohertz power. This makes it suitable for applications that need controlled current delivery instead of direct line-frequency power.

This inverter operates on a mains window of 400 – 480 VAC, switching the input at a clock frequency of 1 kHz to generate the required medium frequency. A nominal system current of 110 A is maintained during steady operation, while transient demands can reach a maximum output of 800 A before protection limits intervene. The electronics reside in an enclosure rated IP20, so installation inside a cabinet is required. Cooling is air based, and at least 100 mm of clearance must be left above and below the unit to keep airflow unobstructed. Overvoltage events are suppressed by an MOV network, and conductor terminations accept ferrules up to 50 mm² with a wire range of 35 mm². The humidity class is F, which suits locations where moisture remains within normal IEC limits. Control logic, diagnostic traffic, and timing are exchanged over the INTERBUS timer interface.

An auxiliary supply of 24 VDC powers the internal control boards, enabling gate drives even when the mains is de-energized. Separate auxiliary power also allows the control section to remain active for status handling and communication during mains interruptions. Secondary-side disturbances up to 36 kA can be tolerated momentarily, which is relevant for spot-welding transformers with steep current peaks. The unit can operate at altitudes up to 2000 m above sea level without derating, provided the cooling air stays below 45 °C and the inverter’s ambient temperature does not exceed 55 °C.