Product Description:

The PSI62C0.120-W1 is a medium-frequency inverter from Bosch Rexroth Indramat in the PSI Frequency Inverters series. It converts three-phase mains power into a regulated medium-frequency output for induction melting, heat treatment, and similar loads that need controlled high current. Programmable timing and isolation between the power stage and the control logic let the unit integrate into closed-loop cells that demand fast current modulation and water-based cooling.

Incoming power is rated for a supply of 400 – 480 VAC across a three-phase network, allowing the inverter to synchronize with standard factory grids. Internally, a clock frequency of 1 kHz sets the switching rhythm for the IGBT modules, enabling fine-grained control over output amplitude. The power stage can deliver up to 1200 A while its nominal system current is 220 A, creating a clear distinction between continuous and peak demand. Low-level electronics are maintained by a 24 V DC control supply, and the same control voltage drives the integrated timer that sequences soft-start and fault routines. Wire terminations accept 95 mm² conductors so feeder cables do not become a thermal bottleneck.

Thermal design centers on a water-cooled jacket that removes cabinet losses. At idle the basic loss is 69 W, while under rated output it rises to 210 W, and the heat exchanger is sized for a worst-case dissipation of 700 W. A flow rate of 4 l/min at a maximum inlet temperature of 30 °C keeps semiconductor junctions within limits, and the circuit connects through an M16 × 1.5 thread. Protection level IP 20 permits installation inside a locked control area, and the electronics remain stable up to an ambient 55 °C provided a 100 mm clearance is observed. For fault energy management, the PSG 3100 secondary can carry 54 kA, ensuring the switchgear withstands short-duration surges.