Product Description:

The PSI6300.333-L1 is a medium-frequency inverter from Bosch Rexroth Indramat's PSI Frequency Inverters series. It converts three-phase mains power into controlled medium-frequency output for induction heating coils, welding transformers, and similar loads that require rapid energy transfer in automated production lines. The unit supports stable current delivery and programmable timing, which helps maintain repeatable thermal cycles during heating and welding processes. Its regulated output also helps surrounding control equipment coordinate heat application with machine motion and part handling.

The inverter operates from a three-phase supply of 400–480 VAC. Its power stage delivers a continuous system current of 110 A, and it can provide up to 800 A during short heating or weld pulses. Internal thermal dissipation reaches 170 W at maximum load, while a separate external air cooler removes an additional 360 W from the cabinet. Pulse-width modulation uses a 1 kHz carrier, and cycle sequencing is coordinated through an INTERBUS timer channel. The control electronics are buffered by a 3.6 V lithium cell so parameter memory and diagnostic data remain available during brief power interruptions. Up to five electrode capacity positions can be set for process adaptation, and field wiring accepts conductors down to 35 mm².

Thermal management uses an air-cooled scheme that draws filtered panel air across the heat sinks. At standby, the basic cabinet loss is only 69 W, which helps limit enclosure temperature rise when process demand is low. The housing has an IP20 rating, so the inverter must be installed inside a protected enclosure. Surge events at the DC link are clamped by an MOV network to help protect the semiconductor stage. Power lugs accept conductors up to 50 mm², which supports secure high-current connections.