Product Description:

For tasks such as medium-frequency welding or induction heating in automated lines, Bosch Rexroth Indramat offers the PSI6300.160-L1. This unit belongs to the PSI Frequency Inverters series and functions as a medium-frequency inverter. It converts three-phase line power into a regulated medium-frequency output so transformers or resonant loads receive precise energy. Integrated control, discrete I/O, and onboard program storage let the inverter handle sequence logic without an external PLC.

With a mains input range of 400 – 480 VAC, the inverter accepts standard plant supplies and draws up to 110 A under rated load. Conductors feeding the power stage must have a minimum cross-section of 35 mm², which helps limit resistive loss and terminal heating. Internally, the rectified link is switched at 1 kHz PWM, shaping the medium-frequency waveform while keeping transformer core loss moderate. The power section tolerates a peak primary current of 800 A, allowing short, high-energy pulses for projection welding. An air-cooled heat sink removes switching and conduction heat, and MOV devices across the DC link provide overvoltage suppression for the IGBT stack.

The output bus can deliver up to 36 kA on the secondary side when feeding the welding transformer, producing high current density at the electrode tips. The enclosure is rated IP20, so installation inside a control cabinet is required. Up to 256 individual process programs are stored in Battery-Buffered RAM, maintaining data during mains loss. Program calls and fault resets arrive through discrete 24 V I/O, and a separate logic supply powers the Standard CPU and timer circuit for coordinated sequencing. Integrated temperature monitoring triggers derating before thermal limits are reached, while internal gating supports as many as 32 electrodes on a single platform.