PSI63C0.738-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI63C0.738-W1 is a medium frequency inverter and part of the PSI Frequency Inverters series. It features a maximum output current of 800 Amps and supports mains voltages from 400 to 480 VAC. The unit uses water cooling with a required flow rate of 4 liters per minute and offers an IP20 degree of protection.
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Product Description:
The PSI63C0.738-W1 belongs to the PSI Frequency Inverters series manufactured by Bosch Rexroth Indramat. Classified as a medium-frequency inverter, it converts the plant's three-phase supply into a controllable medium-frequency output used for induction heating, forging, or other automated metallurgical processes that need precise thermal profiles. By integrating into a closed-loop control system, this unit delivers repeatable energy transfer while keeping the load transformer and work coil within safe electrical limits. The controlled output is suited to processes in which heating quality depends on consistent current delivery and quick response to changing load conditions.
The inverter's electronics are energized by a control supply of 24 V DC, while the power section accepts a mains voltage window of 400–480 VAC. An internal clock frequency of 1 kHz establishes the switching cadence for the IGBT stack and is synchronized over the built-in EtherNet timer. Current capability includes a nominal system value of 110 A and a short-term maximum output of 800 A, giving headroom for rapid heat-up cycles. Metal-oxide varistor overvoltage protection limits transient line spikes, and the basic cabinet loss is 69 W, which must be removed by enclosure ventilation. Wiring can be landed on terminals up to 50 mm², with a recommended wire range of 35 mm², and the housing has a rating of IP 20 for installation inside a closed cabinet. The separate control and power supplies support stable operation in cabinet-based heating systems.
Thermal management relies on a water-cooled block that dissipates as much as 420 W. Coolant enters through an M16×1.5 threaded port, and a flow of 4 l/min keeps the heatsink below the coolant temperature limit of 30 °C. The design supports ambient air up to 55 °C, so the unit can be mounted near furnaces without derating. A secondary current capability of 36 kA on a PSG 3100 transformer output channel enables high-power pulses, while the MOV network suppresses reflected energy. Water cooling reduces heat buildup around the power semiconductors during sustained or pulsed operation.
