PSI63C0.778-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.778-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It is water cooled, features a TriCore CPU, and provides a maximum primary current of 800 Amps with a maximum secondary current of 36 kA. The inverter has a degree of protection rated at IP20, operates on a mains voltage of 400 to 480 VAC and frequency of 50/60 Hz, and uses an Ethernet host interface.
Internal Product Review
The PSI63C0.778-W1 is a Bosch Rexroth Indramat medium frequency inverter with water-cooled construction. Ethernet host interfacing and a TriCore CPU give the unit fast communication and dependable control response. Support for up to 32 electrodes makes the design especially capable for demanding medium-frequency processes.
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Product Description:
The PSI63C0.778-W1 medium-frequency inverter is produced by Bosch Rexroth Indramat for the PSI Frequency Inverters series. As a power conversion module, it supplies controlled high-current output to inductive heating coils and resistance welding transformers used in automated production cells. By converting three-phase mains power into a regulated medium-frequency waveform, the unit lets motion controllers impose precise energy profiles on clamps, heaters, or electrodes, improving process repeatability and reducing cycle time.
Thermal behavior is characterized by baseline cabinet losses of 69 W during nominal operation, rising to 110 W when the inverter delivers its maximum output current; these figures help size panel ventilation and coolant circuits. Because the power stage is water cooled, these heat quantities are removed through a dedicated coolant plate rather than the surrounding air, which keeps adjacent electronics below their temperature limits. Control electronics are powered from a 24 VDC logic rail, while the power section accepts three-phase supply lines between 400–480 VAC at 50 or 60 Hz. An IP20 housing limits finger ingress, and the integrated TriCore CPU communicates with supervisory PLCs over an Ethernet host interface; up to 256 programs can be stored for different weld or heat recipes.
The inverter feeds a welding transformer with a primary current reaching 800 A, producing up to 36 kA on the secondary side so that as many as 32 electrodes can be driven from a single cabinet. Its H-bridge switches modulate a carrier close to 1 kHz, a frequency that minimizes magnetic core size while still allowing tight current regulation by the Ethernet-based timer circuit. Continuous water circulation of at least 4 l/min is required. At this flow rate, the pressure drop across the cooling path stays near 0.1 bar, ensuring stable thermal performance without oversizing the pump.
