Product Description:

The PSI63C0.325-W2 frequency inverter is produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. As a medium-frequency power module, it converts high line voltages into controlled intermediate frequencies for induction heating, welding, or plasma processes in automated cells. The unit mounts inside IP-rated cabinets where closed-loop water cooling and fieldbus-based I/O allow continuous duty with limited thermal load on adjacent electronics. This layout also supports stable operation in compact installations where nearby control hardware must be protected from excess heat.

The inverter accepts a three-phase supply of 480 – 690 VAC and draws a rated mains current of 110 A while delivering an output up to 1 kHz. A water-cooled heat exchanger removes the cabinet base loss of 100 W and the 140 W generated at maximum power. The unit has an IP20 degree of protection, so it is intended for installation inside a suitable enclosure. Internal sequencing is handled by a TriCore CPU, and both the I/O interface and the configurable timer use the INTERBUS protocol, reducing gateway requirements. Line terminations must use a minimum conductor cross-section of 35 mm² to limit resistive losses and satisfy the device's short-circuit withstand rating.

High-demand cycles are supported by a peak primary current of 800 A that can energize a transformer whose secondary may reach 36 kA for short intervals. During such operation, the exchanger is sized for a maximum cooling loss of 420 W; this is achieved when at least 4 L/min of coolant flows through the channels. The water supply must enter below 30 °C and stay under 10 bar to prevent cavitation and gasket fatigue. The coolant circuit therefore plays a central role in sustaining output during repeated short, high-current pulses. As a medium-frequency inverter, the drive keeps switching losses moderate even at elevated carrier frequencies, which supports stable cabling temperatures and predictable cabinet base dissipation.