Product Description:

The PSI6200.757-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. In automated production lines, it converts fixed-frequency mains power into adjustable medium-frequency output that feeds induction heating generators, welding transformers, or other high-current loads. By supplying controlled energy at kilohertz ranges, the unit forms the power stage between the facility’s three-phase supply and process equipment, enabling tight regulation of heat profiles and cycle times in industrial automation cells.

On the input side, the inverter accepts 400 – 480 VAC three-phase mains and draws a nominal 220 A, so the feeder must be sized accordingly; terminals accommodate conductors up to 95 mm². Internally, a 24 V DC supply powers the control electronics at up to 2 A and remains isolated from the power section. Thermal management figures show a basic cabinet loss of 69 W, which can rise to 210 W at maximum load, while the heat removed through the coolant can reach 700 W. Because the power stage operates at a primary voltage frequency of 1 kHz, rapid current reversal occurs, and a water-cooled heat sink is used to keep semiconductor junctions within limits. Drive sequencing and diagnostics are exchanged over an Ethernet interface.

The converter can supply a maximum primary current of 1200 A and, through the matched transformer, a secondary peak of 54 kA during short welding pulses. To sustain these levels, the cooling circuit must deliver 4 l/min, and at least 100 mm of free space is required around the housing for ventilation. The cabinet stands 653 mm high and 288 mm wide, and water lines attach through an M16 × 1.5 thread positioned at the rear. The water-cooled structure works with the stated cooling loss to keep internal temperatures within limits during continuous duty.