Product Description:

The PSI63C0.177-W2 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat for the PSI Frequency Inverters series. It functions as the power stage in industrial automation cells that need tightly regulated medium-frequency energy, such as induction heating coils or resistance welding stations. By converting a wide three-phase supply into controlled high-current output, the unit lets machine builders modulate process power accurately while separating the load from the utility network. This arrangement also helps reduce the direct effect of rapid process load changes on the incoming plant supply.

Electrically, the inverter connects to a three-phase mains bus from 480 - 690 VAC and is fed by an auxiliary control rail rated at 24 V DC. The internal power electronics switch at a clock frequency of 1 kHz, producing a smooth medium-frequency waveform that reaches a maximum output of 800 A. For safety, the device carries an IP 20 degree of protection, so it must be installed in an enclosed panel. The nominal system current is 110 A, yet the design permits brief secondary surges up to 36 kA when matched with an isolation transformer. Conductors up to 35 mm² can be landed on the terminals, and a timer circuit operating on 24 V supervises gating sequences so the switching pattern remains synchronized with upstream control logic.

The thermal design relies on water cooling, and the exchanger must remove 500 W of continuous heat while circulating at least 4 l/min through the integrated channels. In addition, cabinet loss is rated at 100 W, so ventilation inside the control enclosure is still necessary. The inverter maintains all ratings up to an ambient ceiling of 55 °C, making it suitable for hot production areas where air-cooled drives would derate. Despite its power capability, the assembly weighs only 26 kg, allowing straightforward panel mounting. Water cooling also limits the amount of heat released directly into the enclosure compared with a fully air-cooled power stage.