Product Description:

The PSI62C0.620-W1 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat within the PSI Frequency Inverters series. The device conditions three-phase power and delivers a regulated medium-frequency output to induction heaters, welding transformers, and other industrial loads that require controlled high current. Positioned between plant distribution and the process equipment, it provides adjustable frequency and duty cycle for repeatable thermal performance and fast power modulation.

Internally, the pulse modules switch at a clock frequency of 1 kHz, while the supervisory electronics are powered by a separate 24 V DC control supply. The rectifier accepts a mains voltage of 400–480 VAC and can deliver a maximum output current of 1200 A, while continuous operation is based on a nominal system current of 220 A. Transient peaks on the DC link are limited by MOV overvoltage protection, and the downstream transformer can reach a secondary current of 54 kA. The enclosure has an IP20 degree of protection, so the unit must be installed in a switchgear cabinet with at least 100 mm of ventilation clearance. Field terminals accept copper conductors up to 95 mm², and timing and diagnostics are exchanged over a DeviceNet interface.

Thermal regulation is provided by water cooling through a baseplate, and the process water must maintain a cooling flow of 4 L/min. Outlet water must remain below 30 °C to keep semiconductor junction temperatures within the permitted range. The hydraulic connection uses an M16 × 1.5 thread, and ambient temperature can reach 55 °C when adequate flow is present. All electrical and thermal data apply up to 2000 m above sea level, and operation beyond that height may require additional cooling or derating. Basic cabinet heat loss is 69 W, while the dedicated water circuit can remove as much as 700 W from the inverter.