Schneider VX4B900100 Control Block – ATV930 All Ratings

When This Control Block Is the Suspect

• InFn (Internal Error 23) — communication interruption between the control block and the AFE or brake unit (BU) brick. A power reset is required; if the fault returns, the control block’s communication path should be inspected.
• InF0 / InF1 / InF2 / InF3 — relate to control board detection, power board rating validity, or software incompatibility between the power board and control block.
• No display / drive fails to initialize — power is present, but the control block does not boot. Confirm the internal 24 V / 5 V control rails are stable before replacing the block.
• InFr (Internal Error 27) — CPLD signal acquisition anomaly on the control card, often linked to a poor ribbon connection between the control card and the power board after vibration.

Compatibility Check

Before ordering, confirm:

• Drive series — confirm the drive is ATV930 / ATV950 / ATV980. This block is not for ATV61/71 or ATV610/630.
• Original block marking — confirm the existing control block reads VX4B900100.
• Fault context — confirm the active fault is an InF-series internal error (InFn, InF0–InF3, InFr). If the fault is a terminal-level symptom (NST, SPF), the relevant part is the I/O cassette VX4BT900200, not this control block.
• If unsure, send a photo of the original control block label and the drive nameplate before purchase.

FAQ

Does InFn always mean the VX4B900100 control block is faulty?

No. InFn indicates a communication interruption between the control block and the AFE/BU brick. A power reset is the first step. If it persists, check the ribbon connection and the brick before replacing the control block.

Is VX4B900100 the same as the terminal I/O cassette?

No. VX4B900100 is the control block (CPU board). The terminal I/O cassette for ATV900 is VX4BT900200. They are different assemblies.

Does this block cover all ATV930 power ratings?

Schneider designates VX4B900100 as the ATV900 control block for all ratings. However, InF2/InF3 faults explicitly involve power board rating validity and software compatibility, so the power board configuration must match the control block’s stored data.

Condition & Dispatch

This control block is supplied as New / Tested per the listing. Inspection covers connector condition, ribbon interface integrity, and label identity. Photographic records are available on request before dispatch. Confirm the exact condition (new vs. tested/remanufactured) with the supplier before ordering.