Product Description:

The PST6100.331-L is a thyristor power unit manufactured by Bosch Rexroth Indramat within the PST Thyristor Power Units series. It controls high-current pulses for resistance welding transformers and other inductive loads by switching line voltage through phase-controlled thyristors. Integrated communication and timing circuitry allow the device to be installed as the dedicated power stage in an automated cell, where it delivers precisely metered energy to each cycle without adding external gating hardware.

During operation, the converter can supply a nominal current of 130 A, enabling it to feed transformers rated up to 76 kVA. Thermal management is handled by an internal fan, and the assembly is classified as air cooled. The metal enclosure complies with IP20, so it requires placement inside a protected cabinet. Command and diagnostic data travel over an Interbus-S (LWL Remote Bus) interface; an INTERBUS timer on the logic board aligns firing angles with the control network while a 24 V DC logic supply powers the gate drivers. Surge exposure on the mains side is limited by an MOV network. Physical dimensions of 463 mm in height and 280 mm in depth allow straightforward mounting in 600 mm switchgear, and terminal pads accept copper bars sized for the specified current.

Average heat released to the enclosure is capped at 70 W, and the device should not exceed a duty cycle of 50%. Exceeding that level would surpass the 45 °C maximum cooling-air temperature permitted for the heat sink. The unit maintains full performance at ambient conditions up to 55 °C and installation altitudes to 2000 m. Power conductors connect to clamps rated for 50 mm² cross-section, minimizing losses during high-current pulses. Identification on the network is secured through byte 47 (C0), letting supervisory controllers verify the correct module before energizing the load.