PSI63C0.776-W2 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.776-W2 is a medium frequency inverter in the PSI Frequency Inverters series. It has a maximum output current of 800 Amps, a nominal system current of 110 Amps, and supports mains voltages from 480 to 690 VAC. The inverter features water cooling with a required flow rate of 4 liters per minute and a maximum water inlet temperature of 30 °C, and it weighs 26 kilograms.
Internal Product Review
The PSI63C0.776-W2 is a Bosch Rexroth Indramat medium frequency inverter designed for high-demand industrial power conversion. Operation across 480 to 690 VAC mains voltage and up to 800 A maximum output current supports impressive capability in heavy-duty applications. Water-cooled construction with 4 L/min cooling water flow promotes stable thermal control, making this inverter a strong choice for sustained performance.
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Product Description:
The PSI63C0.776-W2 is a medium-frequency inverter manufactured by Bosch Rexroth Indramat as part of the PSI Frequency Inverters series. The unit modulates incoming high-voltage three-phase power to supply controllable current for induction heaters, melting furnaces, or similar high-demand loads in automated production cells. By providing precise current shaping, the inverter allows process controllers to regulate thermal energy accurately and maintain consistent product quality on the line. Its design fits into water-cooled cabinets where footprint and thermal management are constrained. It can support repeatable heating cycles where current stability affects surface finish and material consistency.
Internally, the inverter relies on a water-cooled heat exchanger, and the cooling circuit requires a defined flow rate while limiting inlet water temperature to protect the power section. Under nominal process load, the cabinet dissipates 100 W, rising to 140 W at maximum power, while a design ceiling of 500 W accommodates auxiliary circuit losses. Electronic control circuitry operates from a 24 V DC control voltage and commands the power stage through a 1 kHz clock frequency. Input supply is three-phase 480–690 VAC mains voltage, which the converter shapes into output currents up to 800 A for the induction coil. Line terminals accept copper conductors up to 50 mm², and metal-oxide varistors provide overvoltage suppression. Continuous operation is rated at a 110 A system current at ambient temperatures up to 55 °C. Separating the low-voltage control supply from the main power input also simplifies integration with plant control hardware.
For brief overload conditions, the output transformer can deliver a 36 kA maximum secondary current, and control synchronization is handled through an EtherNet timer type. Cabinet ingress protection is limited to IP20, so the unit must be installed inside an electrical enclosure that meets site safety requirements. The enclosure rating helps guard against accidental contact with larger objects, but it is not intended for direct exposure to water or fine dust. Hydraulic fittings sized M16 × 1.5 form the water connection to the cooling manifold, and flow monitoring should confirm the required rate during operation. The hydraulic connection should remain free of restriction so cooling performance stays consistent during sustained heating duty. Total shipping mass is 26 kg.
