PSI63C0.788-W2 Bosch Rexroth Indramat
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MPN: R911173094
The Bosch Rexroth Indramat PSI63C0.788-W2 is a medium frequency inverter from the PSI Frequency Inverters series. It supports a mains voltage range of 480 to 690 VAC and has a maximum output current of 800 Amps. The inverter uses a water-cooled system with a cooling water flow of 4 liters per minute and features IP20 degree of protection.
Internal Product Review
The PSI63C0.788-W2 is a medium frequency inverter built for high-demand installations, with water-cooled thermal management and a 480 to 690 VAC mains range. A 110 A nominal system current paired with 800 A maximum output current supports strong process stability during heavy industrial duty. EtherNet timer integration and 36 kA maximum secondary current make this unit especially appealing for demanding welding applications.
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Product Description:
The PSI63C0.788-W2 inverter is produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. As a medium frequency inverter, it supplies controlled current for spot-weld stations and automation cells that need medium-frequency energy. The unit converts three-phase mains power into a high-frequency output that the welding transformer uses, ensuring consistent heat input and repeatable weld quality. Its cabinet integrates liquid cooling and interface points that simplify placement inside a machine control panel.
On the electrical side, a control clock of 1 kHz sets the modulation rate for the IGBT bridge, enabling tight regulation of secondary current. The inverter accepts an input line from 480 – 690 VAC, so it can be wired to high-voltage feeders without an autotransformer. Under continuous service, the power section delivers a nominal system current of 110 A, while peak welding pulses can reach 800 A at the output terminals. After the welding transformer, the secondary circuit can momentarily rise to 36 kA, which is typical for spot welding of thick sheet. An internal EtherNet timer coordinates pulses, and the weld control electronics draw logic power from a 24 V DC auxiliary supply routed to the timer board.
Thermal management relies on a 4 l/min water flow through the internal heat exchanger, and this loop keeps semiconductor junctions below the 55 °C ambient rating when cabinet air reaches that temperature. The cooling circuit must stay under a water outlet limit of 30 °C, and the design can dissipate up to 500 W of cooling loss during transient overloads. Base cabinet losses are 100 W at idle and 140 W at maximum power. The housing carries an IP20 protection class, so it requires installation inside a panel with at least 100 mm clearance for cable bends. Power connections accept 50 mm² lugs, control wiring fits a 35 mm² range, and the fittings use an M16 × 1.5 water connection thread.
