PSI6200.737-W1 Bosch Rexroth Indramat
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MPN: R911330143
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The Bosch Rexroth Indramat PSI6200.737-W1 is part of the PSI Frequency Inverters series and is designed as a medium frequency inverter. It features a maximum output current of 1200 Amps and supports a mains voltage range of 400 to 480 VAC. The inverter uses water cooling with a required water flow of 4 liters per minute and supports Ethernet_IP for network communication.
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Product Description:
The PSI6200.737-W1 is a medium-frequency inverter produced by Bosch Rexroth Indramat within the PSI Frequency Inverters series. Designed for resistance welding and other high-current applications, the unit converts three-phase mains power into regulated medium-frequency output for transformer-coupled tooling. This conversion provides precise energy control for welding operations in automated manufacturing cells. The inverter accepts three-phase supply voltages from 400–480 VAC, allowing it to operate with common industrial power systems.
The inverter modulates the incoming power at a clock frequency of 1 kHz to deliver controlled power to the welding transformer. During demanding squeeze or welding pulses, the power stage can provide a maximum output of 1200 A, while the nominal system current is 220 A for use with typical welding-gun transformers. The assembly uses water cooling to remove heat from the power electronics. A coolant flow rate of 4 L/min keeps semiconductor junction temperatures within safe operating limits during repeated welding cycles. The electronics are housed in an enclosure with an IP20 degree of protection, making the unit suitable for installation inside a control cabinet. Ambient air temperatures can reach 55 °C before thermal derating reduces the permitted duty cycle.
For transformer secondary supervision, the drive measures peak welding current up to 54 kA. Integrated sensors shut down the inverter if the cooling-water temperature exceeds 30 °C, protecting the power stage from excessive heat. An internal stop circuit rated at 24 VDC / 3 A supports connection to standard machine safety relays. Control and diagnostic data are exchanged over EtherNet/IP, while cycle timing is managed by the built-in Ethernet timer function. A 60-second idle timeout and a 5-second pressure-feedback window coordinate welding-gun motion. A 250-millisecond contactor-feedback check and a 1-second squeeze-extension limit help detect sequence errors. The cooling circuit connects through an M16 × 1.5 threaded interface, and temperature monitoring is integrated into the power stack for direct thermal supervision during operation.
