Schneider VX4A1110 Filter Board – Tested ATV61/71 45–75 kW

What Is the VX4A1110 Filter/Surge Absorption Board?

The Schneider VX4A1110 is the input filter and surge absorption board used in Altivar ATV61 and ATV71 drives on Frame Size 8, covering 45, 55, and 75 kW models. It corresponds to Schneider part number PN072146P1 in the spare-parts documentation. Its function is to absorb high-frequency transient energy generated by thyristor commutation and IGBT switching, smoothing DC bus voltage fluctuations and reducing conducted emissions that can disturb nearby control equipment on the same supply.

This is a passive filtering and protection board, not a trigger board, pre-charge board, or main control board. Supplied as a tested replacement unit, it is intended for cases where the original filter board has been physically damaged, has failed insulation or component-level testing, or where systematic interference symptoms have been traced to a degraded absorption path after external causes have been excluded.

Technical Specifications

Important Diagnostic Boundary: VX4A1110 is not the default cause of every OSF trip or interference symptom. OSF can be triggered by mains voltage fluctuation, an unstable supply, or a faulty internal detection element even with a functional filter board. System-level interference may also originate from improper grounding, missing shielding, or a neighbouring noise source. The filter board should be replaced when it is physically damaged, has failed insulation/component testing, or when systematic exclusion has isolated the absorption path as the degraded element.

When to Investigate or Replace the VX4A1110 Board

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

• Recurrent OSF with verified-stable supply — Schneider’s official OSF guidance for ATV61/71 begins with mains voltage measurement at L1/L2/L3 and monitoring in menu 1.2. If the supply is stable and within rated range, but transient overvoltage behaviour persists, the absorption path may no longer be clamping effectively.
• Systematic interference symptoms — PLC resets, communication dropouts, or analog signal jitter occurring on the same supply, where grounding and shielding have been checked and the disturbance tracks with drive operation.
• Visible damage on the board — burn marks, cracked absorption components, or discoloration on the RC/snubber section.
• Insulation or component-level test failure — confirmed by bench measurement before replacement.

Caution: Before ordering, confirm that mains voltage is stable, grounding and shielding are correct, and that the active fault is not being caused by another power-stage board (e.g., the SCR trigger board for CrF, or the IGBT power board for SCF/OCF). VX4A1110 addresses passive filtering and transient absorption, not switching or power conversion.

Compatibility & Verification

Before ordering, confirm the following:

• Drive model and frame size — confirm the exact ATV61/71 catalogue number. VX4A1110 is associated with Frame Size 8 (45–75 kW); other frame sizes use different filter board variants (e.g., VX4A1109 for Frame Size 7B).
• Original board marking — confirm the existing board reads VX4A1110 or PN072146P1.
• Fault context — confirm whether the symptom is OSF after supply verification or system-level interference after grounding/shielding checks. This board is a filtering/absorption element, not a fault-code-specific trigger board.
• If uncertain, send a photo of the drive nameplate and the original filter board label for review before purchase.

Frequently Asked Questions

Does VX4A1110 fix every OSF fault?

No. OSF is a mains overvoltage fault. Schneider’s guidance starts with supply voltage verification and DC bus measurement. A degraded filter board can contribute to transient overvoltage behaviour, but it is not the default cause. Supply-side issues and internal detection faults must be excluded first.

Is VX4A1110 the same as the SCR trigger board PN072139P904?

No. VX4A1110 is the filter/surge absorption board. PN072139P904 is the SCR trigger / pre-charge board. They sit on different functions of the input power path and are not interchangeable. If the drive reports CrF (pre-charge fault), the relevant board is the trigger/pre-charge board, not VX4A1110.

What is the OEM reference for VX4A1110?

PN072146P1 is the Schneider part number associated with the VX4A1110 filter board in ATV61/71 spare-parts documentation