PSI6300.257-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI6300.257-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It supports a mains voltage of 400 to 480 VAC and delivers a maximum output current of 800 Amps. The unit features water cooling with a minimum cooling flow of 4 liters per minute and operates with a control supply of 24 V DC.
Internal Product Review
The PSI6300.257-W1 is a medium frequency inverter built for demanding drive applications, with a 400 to 480 VAC mains range and water-cooled thermal management. A 110 A nominal system current paired with 800 A maximum output current supports strong dynamic headroom during high-load operation. IP20 protection and MOV overvoltage protection make the unit a well-engineered choice for controlled industrial installations.
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Product Description:
The PSI6300.257-W1 medium-frequency inverter belongs to the PSI Frequency Inverters series produced by Bosch Rexroth Indramat. Intended for induction heaters, welders, and other processes that demand tightly controlled medium-frequency power, the unit converts the plant supply voltage into a regulated output through insulated-gate transistors operating at medium switching rates. Its water-cooled design and IP20 housing allow installation inside electrical cabinets while supporting continuous operation in automated production lines.
The inverter accepts line input voltages from 400 to 480 VAC, a range common to three-phase industrial power systems. Internally, the power stage operates at a clock frequency of 1 kHz, which sets the modulation timing for the medium-frequency output. Under rated conditions, it delivers a nominal system current of 110 A, yet it can supply up to 800 A during brief dynamic peaks. Copper bars support this current capacity and accommodate conductors with cross-sectional areas from 35 mm² to 50 mm². A basic cabinet power loss of 69 W indicates the amount of heat that the cooling system must dissipate. A dedicated metal-oxide varistor network clamps overvoltage events to help protect the internal power electronics.
Heat is removed by a cooling loop with a flow rate of 4 L/min, which connects through M16 × 1.5 ports in the rear panel. The coolant temperature must not exceed 30 °C to keep the semiconductor junctions within their operating limits. Because the enclosure provides IP20 protection, a minimum cabinet clearance of 100 mm is necessary to maintain unobstructed airflow around auxiliary components, and the ambient temperature must remain below 55 °C. The inverter maintains its rated output at installation elevations up to 2000 m and can operate in humidity class F conditions. Its control electronics use an isolated 24 V DC supply and exchange status data through a PROFIBUS timer interface.
