Product Description:

The Bosch Rexroth Indramat PSI63C0.777-W2 belongs to the PSI Frequency Inverters series and is classified as a medium-frequency inverter for resistance welding installations and other high-current processes in automated cells. It converts three-phase mains power into a regulated DC link and pulsed output for welding transformers. This supports precise heat input and repeatable joint quality on production lines.

Electrical input flexibility is provided by a mains window of 480-690 VAC, while the inverter’s switching stage operates at a clock frequency of 1 kHz to shape the medium-frequency waveform. Continuous duties are handled at a nominal system current of 110 A, but peak demands can reach 800 A on the secondary side. Thermal management relies on water cooling; a flow of 4 l/min through the M16 × 1.5 ports removes internal heat and limits cabinet dissipation to just 100 W during base load. The design carries an IP20 degree of protection, accepts control through an Ethernet I/O interface, and integrates an EtherNet-based timer that coordinates the 24 V DC weld timer supply. Power terminations accommodate 35 mm² conductors, and the cooling loop can absorb up to 500 W before auxiliary exchangers are needed.

At maximum production load, cabinet heat rises to 140 W and stays within the capacity of the water-cooled circuit, so electronic components remain stable. When paired with a PSG 3100 welding transformer, the inverter can drive secondary currents up to 36 kA for short pulses without waveform degradation. Reliable operation of the heat exchanger is maintained as long as the inlet temperature does not exceed 30 °C. The compact mechanical package weighs only 26 kg, allowing installation on slide-in racks inside protected control enclosures.