PSI63C0.757-L2 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.757-L2 is a medium frequency inverter from the PSI Frequency Inverters series. It is air cooled, with a maximum operating temperature of 45 degrees Celsius and supports mains voltages from 480 to 690 VAC. This inverter provides a maximum secondary current of 36 kA and features IP20 protection.
Internal Product Review
The PSI63C0.757-L2 is a well-executed medium frequency inverter with air-cooled operation and IP20 protection. The 480 to 690 VAC mains voltage range and 110 A nominal mains current support confident integration in demanding drive systems. A 1000 Hz sequence frequency stands out as a strong performance advantage.
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Product Description:
The PSI63C0.757-L2 frequency inverter is produced by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. Within an assembly line, this medium-frequency inverter converts high-voltage three-phase mains power into a controlled output for induction heating, welding, or other processes that need adjustable medium-frequency power. It installs inside a control cabinet and connects to Ethernet timers so sequence commands can be synchronized with other motion or process controllers.
This cabinet-mounted unit carries a protection rating of IP20, so live parts are shielded from touch, but the enclosure is not sealed against dust. The input section accepts a mains range of 480–690 VAC, allowing direct connection to common 600-volt plant supplies. Under rated conditions, the inverter draws a nominal current of 110 A; upstream breakers and busbars must be sized for that continuous load. During short bursts such as startup, the primary circuit can momentarily reach 800 A, and the downstream secondary winding can tolerate fault currents up to 36 kA before protective devices must interrupt the circuit. Cabinet thermal losses range from 100 W in standby to 200 W at full load, and these values support ventilation calculations when multiple inverters share one enclosure.
The power stage is designed for grid sources operating at 50/60 Hz, so no transformer is needed when the plant follows standard utility frequencies. Because the chassis is air-cooled, the ambient temperature around the heat sinks must remain at or below 45 °C, and a mounting clearance of 100 mm on all sides prevents airflow obstruction. Reliable operation is maintained at elevations up to 2000 m without derating, which covers most production sites outside extreme-altitude locations. The internal control section issues trigger pulses at a sequence frequency of 1000 Hz; this high switching rate minimizes ripple in the medium-frequency output used by connected coils. Installation requires 35 mm² supply conductors and 50 mm² terminal clamps. The 24 VDC stop circuit carries 3 A to ensure safe shutdown when an emergency stop signal is received.
