PSI64C0.168-W1 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat PSI64C0.168-W1 is a medium frequency inverter from the PSI Frequency Inverters series that uses a TriCore CPU and a water-cooled system requiring a minimum water flow of 4 liters per minute. It supports a mains voltage of 400 to 480 VAC, a nominal current of 220 A, and features a maximum secondary current of 54 kA. The unit has a cabinet loss at max output of 210 W and utilizes an HDFK lead-through power terminal type.
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Product Description:
The PSI64C0.168-W1 medium frequency inverter is supplied by Bosch Rexroth Indramat within the PSI Frequency Inverters series. It converts a three-phase mains supply into controlled medium-frequency output used for induction hardening, brazing, and similar automation tasks. The unit houses power electronics, a TriCore CPU for real-time control, discrete 24 V I/O for machine signals, and an internal 24 V timer circuit that sequences heating profiles. HDFK lead-through terminals accept 95 mm² conductors so the inverter can be wired directly inside a cabinet without additional busbars. This arrangement lets the controller coordinate heating steps with external machine commands while the power stage maintains the required output to the load. Because the timer circuit is internal, heating sequences can be staged without a separate timing module in the cabinet.
The inverter’s thermal profile starts with a base cabinet loss of 69 W, which is the heat produced in standby. Under rated load, the cabinet loss rises to 210 W. Because the power section is water cooled, heat is transferred to a plate that connects to plant piping through a M16x1.5 coupling thread. The mains bridge accepts input from 400 – 480 VAC and draws a nominal 220 A, so the upstream supply must support high current demand. Water cooling moves most of the generated heat out of the enclosure instead of relying on internal airflow alone. The control section continues to handle timing and interlock functions while the cooling plate removes heat from the power electronics.
At full power, the liquid circuit has a specified maximum cooling loss of 700 W. Reaching this value produces a pressure drop of 0.6 bar across the heat exchanger when flow is held at 4 l/min. The diode rectifier can surge to a primary current of 1600 A, allowing the connected PSG 3100 converter to supply very high current pulses to the work coil during short heating intervals. Stable coolant flow is important because the inverter combines high-current switching with tightly timed process control inside the same cabinet-mounted unit. This operating pattern is suited to applications where energy must rise quickly and then drop again between repeated heating cycles.
