Product Description:

The PSI6300.133-L1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It is intended for industrial heating, forging, and metal-processing equipment that demands tightly regulated medium-frequency current. Positioned between the plant’s three-phase supply and the work coil, the unit modulates output magnitude and duration while coordinating with supervisory PLCs through its built-in INTERBUS-S fieldbus channel for parameter transfer and status reporting.

In normal operation, the inverter accepts a 400-480 VAC mains input across a three-phase network and derives its logic functions from a 24 VDC control supply. The primary power path is protected against surges by an MOV array, and the enclosure carries an IP20 rating that permits cabinet mounting in clean electrical rooms. Output current can be regulated up to 800 A, while the nominal continuous value remains 110 A; regulation steps are resolved in 10 A increments to align with coarse heating profiles. Air cooling draws cabinet air across internal heat sinks, and at least 100 mm of vertical clearance must be kept above and below the module for unobstructed airflow. Power lugs accept stranded conductors up to 50 mm², and the control terminals accommodate wiring up to 35 mm².

For sequence handling, the inverter stores up to 256 user programs, each referenced to a 1 ms program time base that aligns with the internal gating clock of 1 kHz. This rapid timing allows pulse patterns to be altered in millisecond intervals without compromising phase symmetry at the secondary output. During peak quench or forging cycles, the transformer-coupled secondary can deliver up to 36 kA, and the control circuitry stops the selected program when the measured value exceeds set limits. An onboard timer module coordinates external contactors and prevents restart until cooling airflow returns to nominal.