Product Description:

The PST610E.101-W thyristor power unit is produced by Bosch Rexroth Indramat within the PST Thyristor Power Units series. Built for integration in automated welding lines, furnaces, and test stands, it modulates AC line power with a two-phase thyristor bridge so a transformer can supply controlled current to the load. By converting logic-level commands into phase-angle firing pulses, the module forms the link between low-power PLC signals and the high process currents required in industrial equipment. This arrangement supports repeatable heat input and timing control during processes that depend on accurate current delivery.

Its control electronics draw 24 VDC and dissipate only 10 VA, which helps limit added heat inside the cabinet. A water-cooled plate removes losses from the dual SCR stack, and the line side is rated for 130 Arms of continuous current. The gating algorithm limits conduction to a maximum of 50 % per cycle to protect the silicon devices, while a lithium backup cell maintains parameter memory at 3.6 V when control power is unavailable. Sixteen discrete inputs accept enable, trigger, and mode signals, and twelve discrete outputs return status information to a PLC. Power connections accept conductors up to 50 mm² for low-impedance links between the unit and bus bars.

For intermittent peaks, the power stage can deliver 300 A during short-duty operation, and the associated transformer is matched for heavy pulse loading in the same operating window. Cooling liquid at the inlet must stay below 30 °C to keep semiconductor junction temperatures within a safe range during repeated cycles. The housing has an IP20 enclosure rating for installation inside closed electrical cabinets, and a programmable interface operating at V24/RS232 levels supports parameter transfer and diagnostic communication. Each O00 through O03 output can drive 1 A coils, and a 24 V timer section coordinates weld, hold, and cool intervals with upstream sequencing. That timing control helps the unit manage current flow, coolant coordination, and logic responses without requiring separate external timing hardware for every step.