PSI 6300.650L1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI 6300.650L1 is a medium frequency inverter in the PSI Frequency Inverters series, featuring air cooling and an IP20 protection rating. It operates with a mains voltage of 400 to 480 VAC and a nominal current of 110 Amps, supporting a maximum operating altitude of 2000 meters. The inverter offers 256 programmable programs and integrated temperature monitoring.
Internal Product Review
The PSI 6300.650L1 is a medium frequency inverter that impresses with 400 to 480 VAC mains input and a 110 A nominal current for stable industrial power control. Air-cooled construction and integrated temperature monitoring support dependable thermal management in demanding welding environments. Integrated weld timer functionality and storage for 256 programs make the inverter a highly capable choice for repeatable production welding.
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Product Description:
The PSI 6300.650L1 is a medium frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. In resistance welding cells and other high-current processes, the unit converts three-phase mains power into a regulated medium-frequency output that the welding transformer can use for precise heat control. As a cabinet-mounted module, it interfaces with plant PLCs, supervises current feedback, and delivers repeatable energy pulses to maintain joint quality across automated production lines. This operating method supports stable weld timing and consistent energy delivery during repeated production cycles.
The inverter draws three-phase power in the range of 400 – 480 VAC and can conduct a continuous mains nominal current of 110 A. Internal logic is supplied from an isolated 24 VDC rail, allowing the control electronics to remain active without energizing the power stage. Heat generated by switching losses is removed through an air-cooled path, and the housing carries an IP20 protection rating suited for installation inside control enclosures. Conductors enter screw terminals that accept a minimum cross-section of 35 mm² and up to 50 mm², which supports secure power connections in cabinet wiring layouts. The primary bridge switches at 1 kHz, producing the medium-frequency waveform that reduces transformer size and improves weld consistency. Integrated temperature monitoring trips the drive if the heat sink overheats, and climatic category 3K3 sets the permissible ambient humidity and dust limits. The separated control supply also helps preserve status and control functions when the main power section is inactive.
Upstream protection must tolerate a peak line draw of 800 A, and the downstream PSG 3100 transformer can experience secondary bursts reaching 36 kA during short-circuit welding sequences. The inverter maintains full output up to 2000 m above sea level, and the controller can store 256 user programs in battery-buffered RAM for quick changeovers between weld schedules. A built-in weld timer issues millisecond-level energy windows, and connection integrity is supported by terminal capacity matched to the stated conductor range. By monitoring primary current in real time, the control loop compensates for electrode wear during operation. This allows the process to respond to changing welding conditions without interrupting the programmed cycle.
