PSI65C0.181-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI65C0.181-W1 is a medium frequency inverter from the PSI Frequency Inverters series. It uses a water cooled system with a TriCore CPU and supports a logic supply of 24 VDC. The inverter has a mains voltage range of 400 to 480 VAC and offers a maximum cooling loss of 4400 Watts with an IP20 protection rating.
Internal Product Review
The PSI65C0.181-W1 is a medium frequency inverter from Bosch Rexroth Indramat with water-cooled thermal management. Operation across 400 to 480 VAC mains voltage and a 24 V discrete I/O interface supports straightforward integration in high-demand control systems. A max primary current of 2400 A stands out as a strong advantage for heavy-duty inverter service.
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Product Description:
The PSI65C0.181-W1 medium-frequency inverter is built by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It supplies adjustable medium-frequency power to induction coils and similar loads in automated manufacturing cells where precise energy regulation is needed for heat treating, brazing, or forging stations. This type of control helps match delivered energy to the heating step, which supports repeatable thermal cycles on parts that must be processed consistently. A TriCore processor manages up to 256 selectable programs and coordinates 24 V discrete I/O with the drive's gating circuits. Because program selection is handled inside the unit, the inverter can switch between stored process settings without manual recalculation of output behavior.
This inverter connects to three-phase utility lines in the range of 400 - 480 VAC, while its internal logic stage is fed from a separate 24 VDC supply so that control electronics remain active during line disturbances. Keeping the control stage separate allows command handling and status monitoring to continue even if the main power path is interrupted. On the power path, the unit can draw a maximum primary current of 2400 A and deliver a secondary current peak of 120 kA (PSG 3100) when matched with the specified output transformer. This arrangement supports applications that need short, intense heating pulses as well as longer energy delivery periods with stable regulation. Water cooling removes up to 4400 W of heat from the semiconductor stack, helping prevent thermal derating during continuous high-load operation.
The liquid circuit requires a minimum flow of 10 l/min at a line pressure not exceeding 10 bar. Under these conditions, the pressure drop across the inverter's cooling channels is about 0.65 bar, and the inlet temperature must stay below 30 °C for proper heat removal. The chassis measures 280 mm in depth and 860 mm in height, while the width is 396 mm, allowing cabinet installation behind IP20 protective covers. Side panels carry the water connections and the 24 V timer module, while the front panel gives access to the discrete I/O terminal strip, which keeps routine electrical and coolant connections accessible from the enclosure exterior. The compact enclosure format helps the unit fit into cabinets that also contain transformers, contactors, and process-control hardware.
