PSI62C0.720-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI62C0.720-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It features a mains voltage range of 400 to 480 VAC and a continuous current of 220 Amps. This water-cooled unit offers cabinet losses at a maximum of 210 Watts and operates with a control cycle of 1 millisecond.
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Product Description:
Bosch Rexroth Indramat supplies the PSI62C0.720-W1 as part of its PSI Frequency Inverters series. This medium-frequency inverter drives induction loads by rectifying the plant’s 400–480 V AC mains supply and producing a 1 kHz pulse-width-modulated primary voltage for specialized transformers. Within automated lines, it provides regulated medium-frequency power while exchanging supervisory control data through an integrated Ethernet timer interface, making the unit suitable as an energy source for welding, soldering, or heat-treatment stations.
The power section accepts a line voltage of 400–480 VAC and can draw a continuous current of 220 A from the mains. The incoming terminals accommodate conductors up to 95 mm². A digital regulator updates every 1 ms, allowing tight power modulation under rapidly varying load impedances. Internal electronics are supported by a 24 VDC service rail with a current limit of 2 A. The basic losses inside the switch cabinet are 69 W, with an additional 210 W of cabinet losses at maximum utilization. The housing has an IP20 protection rating, providing protection against accidental finger contact when the inverter is installed inside a closed enclosure. The surrounding enclosure must provide the required protection against dust, moisture, and other external contaminants.
Heat generated by the IGBTs is removed through a water-cooled plate, reducing the thermal load released directly into the cabinet. The cooling circuit requires a minimum coolant flow of 4 L/min and supports a maximum line pressure of 10 bar. At nominal flow, the pressure drop across the cooling circuit is only 0.6 bar. Under maximum operating load, the heat exchanger must dissipate up to 700 W of heat from the inverter. On the output side, the inverter can supply a primary current of 1200 A. When paired with a PSG 3100 transformer, it can deliver a secondary pulse current of 54 kA for high-power induction processes. The available primary and secondary currents support large induction coils while keeping the semiconductor switches within their operating limits.
