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Siemens A5E00755411 | SINAMICS S120 Variable-Frequency Drive Power Board PSBC2

Part Number: A5E00755411

Manufacturer: Siemens AG (Germany)

Product Type: PSBC2 — Power Supply Board for Chassis (Variant 2)

Product Family: SINAMICS S120 Chassis Drive System 

Role in the S120 Architecture

The A5E00755411 is the PSBC2 power board inside the Siemens SINAMICS S120 chassis drive. It converts the incoming AC or DC bus voltage into the regulated low-voltage rails — typically 24V, 15V, and 5V DC — that power the chassis unit's control electronics: Control Unit interface circuitry, gate drivers, measurement electronics, and communication interfaces.

A failed PSBC2 removes all control-section supply simultaneously. The result is a completely silent drive — no display, no DRIVE-CLiQ activity, no fault codes. This total-silence failure pattern with confirmed AC supply is the clearest indicator of a failed internal power supply board. It should be distinguished from Control Unit failures, which typically produce partial or degraded communication rather than complete silence.

Quick Reference

FAQ

Q1: The S120 chassis is completely silent — no display, no DRIVE-CLiQ. Is A5E00755411 the likely fault?

Yes. A dead PSBC2 removes all supply voltages at once. First verify the AC input and any internal fuses are intact. If supplies are confirmed good and the unit is still silent, the PSBC2 has failed.

Q2: Can the PSBC2 output voltages be measured in-circuit to confirm the board has failed?

Yes. Measure the secondary DC rails at accessible test points with the chassis powered. Any rail absent or significantly below its nominal value confirms a PSBC2 output fault.

Q3: Will parameter re-entry be needed after fitting a replacement PSBC2?

No. The PSBC2 stores no drive parameters. All configuration remains on the Control Unit's CompactFlash card. The drive restores its parameter set automatically at power-up.

Q4: The unit failed during a voltage surge. What else should be checked before replacing the PSBC2?

Inspect AC input fuses, MOV surge protection, and the pre-charge circuit. After fitting the new PSBC2, verify the Control Unit's 24V rail is within specification before concluding the CU survived the event undamaged.

Q5: Are new units of A5E00755411 still available, or only refurbished?

Both new and tested-refurbished units are available through the SINAMICS aftermarket. Exchange programmes are common with specialist repair companies. Always request a functional test certificate for any refurbished unit.