Product Description:

The PSI 6300.637L1 is a medium-frequency inverter developed by Bosch Rexroth Indramat within the PSI Frequency Inverters series. Designed for induction heating, hardening, and other high-power process loads, the unit converts three-phase mains energy into controlled medium-frequency output for precise thermal profiles on production lines. Its modular cabinet format combines the power stage, control electronics, and cooling plenum in one assembly for metalworking or forming equipment that requires adaptable power regulation and stable process output.

The power section accepts a three-phase supply between 400–480 VAC, while the control electronics draw 24 V DC from an external source to keep logic active during line disturbances or controlled shutdown events. Internal gating is synchronized by a carrier clock of 1 kHz, giving fine timing resolution when the inverter modulates its H-bridge. Under nominal conditions the system delivers continuous line current, but the output stage can reach a peak of 800 A during short heating ramps. Electrical switching and transformer stray losses inside the cabinet add only 69 W of base dissipation, so most enclosure heat comes from load-dependent conduction losses removed by forced air.

Forced-air cooling removes up to 360 W of heat through the heat sinks, and the enclosure maintains an IP 20 rating when installed with the specified 100 mm airflow clearance. The electronics remain stable at ambient temperatures up to 55 °C, aided by MOV overvoltage clamps that protect the DC link from line spikes. Secondary output currents can momentarily reach 36 kA without saturating the transformer. A 3.6 V lithium backup cell preserves stored parameters when plant power is off, and the terminals accept conductors up to 50 mm² with a recommended drive wire size of 35 mm² to match the lug geometry.