PSI63C0.778-L2 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.778-L2 is a medium frequency inverter in the PSI Frequency Inverters series, offering a nominal system current of 110 Amps and a maximum output current of 800 Amps. It operates with a mains voltage range of 480 to 690 VAC and features air cooling with a maximum cooling loss of 360 Watts. The device includes overvoltage protection using a metal oxide varistor and has an IP20 protection rating.
Internal Product Review
The PSI63C0.778-L2 is a medium frequency inverter from Bosch Rexroth Indramat built for high-demand power conversion with a 480 - 690 VAC mains voltage range. Air-cooled construction and IP20 protection support dependable cabinet integration in controlled industrial environments. A maximum output current of 800 A stands out as a strong performance attribute for demanding frequency inverter applications.
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Product Description:
The PSI63C0.778-L2 is a medium-frequency inverter module from Bosch Rexroth Indramat within the PSI Frequency Inverters series. As a dedicated power converter, it supplies controlled high-current outputs to induction heating rigs, welding heads, or other processes that benefit from variable medium-frequency energy. In an automation line, the unit bridges the plant's three-phase mains and the secondary circuit, shaping voltage and current according to a programmed profile.
The inverter draws three-phase power from 480–690 VAC and is stabilized by a 24 V DC control supply that can source 2.5 A for logic and I/O boards. Its internal chopper operates at a 1 kHz clock frequency, enabling smooth current modulation up to 800 A on the primary side, while the nominal continuous level is 110 A. When coupled to a PSG 3100 transformer, the secondary circuit can momentarily reach 36 kA, giving ample headroom for short, high-energy pulses. Thermal losses are managed by air cooling; cabinet dissipation peaks at 200 W, and an additional 360 W of cooling loss must be removed by the machine airflow. Surge events are limited by a metal-oxide varistor, and all terminations accept copper conductors up to 35 mm². The chassis installs through recessed mounting, and timing coordination with higher-level controllers occurs over the EtherNet timer interface.
Continuous duty is permitted up to 55 °C, after which derating is required to protect components. The housing is rated IP20, so it must be placed inside a protected electrical cabinet. User sequences, setpoints, and diagnostic routines occupy a nonvolatile space of 256 program steps, allowing tailored process curves without external PLC resources. During operation, the air-cooled path keeps semiconductors below junction limits, and the internal metal-oxide varistor maintains overvoltage protection during fast line transients.
