Schneider PN072146P1 Surge Board – Tested ATV61/71 90–132 kW

What Is the PN072146P1 Surge Absorption Board?

The Schneider PN072146P1 is the input-side surge absorption and filter board used in Altivar ATV61 and ATV71 drives in the 90–132 kW power range. It carries the spare-part designation VX4A1110. In the ATV61/71 power path, this board sits on the input rectification side, suppressing high-frequency transient voltages and conducted noise that could otherwise stress the DC bus and the rectifier components. Its function is protective and filtering-oriented, not switching or triggering.

Supplied as a tested replacement unit, it is intended for cases where the surge absorption path has been isolated as the source of recurrent overvoltage behaviour, after external supply and application-side causes have been excluded.

Technical Specifications

Important Functional Boundary: This board performs surge absorption and filtering, not SCR triggering or pre-charging. The ATV61/71 pre-charge and rectifier trigger function is handled by a different board (e.g., PN072139P904 / VX5A1300). If the drive is reporting CrF (pre-charge fault) rather than OSF, the PN072146P1 is not the correct replacement target.

When to Investigate or Replace the PN072146P1 Board

The board becomes a legitimate suspect under the following conditions, after external causes have been excluded:

• OSF (Mains Overvoltage) with verified-normal supply — Schneider’s official guidance for OSF on ATV61/71 specifies checking the mains voltage at L1/L2/L3, monitoring the mains voltage value in menu 1.2, and measuring the DC bus (PA/+ to PC/−) before concluding an internal hardware fault. If the supply is stable and within the drive’s rated range, but OSF recurs, the surge absorption path may no longer be clamping transients effectively.
• Recurrent transient overvoltage behaviour — measured bus voltage shows abnormal spikes that are not explained by supply disturbances or load regeneration.
• Visible damage on the board — burn marks, cracked absorption components, or discoloration on the surge/filter section.

Caution: OSF can also be caused by mains voltage fluctuation or a faulty internal detection element even when the surge board is functional. The board should be replaced only after the supply-side checks prescribed by Schneider have been completed.

Compatibility & Verification

Before ordering, confirm the following:

• Drive MLFB — the exact ATV61/ATV71 catalogue number on the nameplate. The 90–132 kW range spans specific frame sizes; this surge board is frame-dependent.
• Original board marking — confirm the existing board reads PN072146P1, and check whether the spare-part marking VX4A1110 is also present.
• Fault type — confirm the active fault is OSF (Mains Overvoltage), not CrF (Pre-charge). If CrF is present, the relevant board is the SCR trigger / pre-charge board, not this surge absorption board.
• If uncertain, send a photo of the drive nameplate and the original surge board label for review before purchase.

Frequently Asked Questions

Does OSF always mean the surge absorption board is faulty?

No. Schneider’s official OSF troubleshooting for ATV61/71 starts with mains voltage verification, menu 1.2 monitoring, and DC bus measurement. Supply-side fluctuations and internal detection issues can also produce OSF. The surge board is one possible contributor, not the default cause.

Is PN072146P1 the same as the SCR trigger board PN072139P904?

No. The PN072146P1 is the surge absorption / filter board. The PN072139P904 (VX5A1300) is the SCR trigger / pre-charge board. They serve different functions in the input power path and are not interchangeable.

What is the spare-part designation for this board?

VX4A1110 is the commonly referenced spare-part designation for the PN072146P1 surge absorption board in ATV61/71 drives