Schneider PN072323P702 Fan Control Board – Tested ATV61/71 Spare

What Is the PN072323P702 Fan Control Board?

The Schneider PN072323P702 is the fan control board used in Altivar ATV61 and ATV71 drives. Its primary function is to drive and monitor the drive’s cooling fans, translating the main control board’s thermal management commands into fan power and speed control. When fan operation is abnormal, the drive may report OHF (Drive Overheat) or a fan-related fault, depending on the frame and firmware configuration.

Important Identity Boundary — Fan Board, Not Brake Board: PN072323P702 is frequently listed alongside VZ3F111 and described as a “brake unit control board” on some spare-part channels. However, the drive’s spare-parts documentation and field listings distinguish the two: PN072323P702 is the fan control board, while VZ3F1113 is the separate dynamic brake board used for ATV61/71 models that require a braking option. The brake board sits in the braking/regeneration path and is a different physical assembly. Buyers searching for a brake board should confirm whether their drive actually uses VZ3F1113, not PN072323P702.

Supplied as a tested replacement unit, this board is intended for cases where fan control has been isolated as the fault source after fan motor and airflow checks.

Technical Specifications

When to Investigate the Fan Control Board

The board becomes the primary suspect on the fan side under these conditions, after external causes have been excluded：

• OHF with no fan rotation — the drive reports overheat, and the heatsink fan is confirmed not spinning despite the drive being powered. If the fan spins freely by hand and receives no supply voltage, the control board’s output stage is implicated.
• Fan supply present but fan not running — measured voltage at the fan connector is within specification, but the fan does not turn. This points to the fan motor itself rather than the board; if supply is absent, the board is the stronger suspect.
• Fan speed / regulation abnormality — the fan does not respond to the drive’s cooling commands, or runs at a fixed speed regardless of thermal state.
• Visible damage on the board — burn marks, failed power components, or damaged connectors.

Critical caution — OHF is not automatically a board fault: Before replacing this fan control board, confirm that the heatsink fins and airflow path are not clogged with dust or debris, and that the fan motor spins freely without bearing noise. In field practice, blocked airflow and a mechanically seized fan are at least as common as a failed control board when OHF appears。Schneider’s OHF guidance for ATV61/71 also specifies checking fan operation and top-of-drive blockage as the first steps.

Brake-side note: If the drive is reporting OBF or bLF, the relevant hardware is the brake board VZ3F1113 or the braking resistor/braking unit configuration, not PN072323P702. OBF is triggered when DC bus voltage reaches the braking threshold during operation, and the primary causes are deceleration time too short, high-inertia load, or missing/undersized braking resistor. Do not order a fan control board to resolve a brake-path fault.

Compatibility & Verification

Before ordering, confirm the following:

• Drive model and frame — confirm the exact ATV61/ATV71 catalogue number on the nameplate. Fan control board fitment varies by frame size.
• Original board marking — confirm the existing board reads PN072323P702. If the original is marked VZ3F1113, that is the brake board, not this fan board.
• Fault context — confirm whether the active fault is on the fan side（OHF / fan fault） or the brake side（OBF / bLF）. This board addresses the fan side only.
• If uncertain, send a photo of the drive nameplate and the original board label for review before purchase.

Frequently Asked Questions

Is PN072323P702 a fan control board or a brake board?

It is a fan control board. Some listings associate it with VZ3F111 and describe it as a brake unit control board, but the spare-parts documentation distinguishes PN072323P702（fan control） from VZ3F1113（dynamic brake board. The two are separate assemblies for different functions.

Does OHF always mean this fan control board needs replacement?

No. OHF is triggered when the drive thermal state reaches 118%。Blocked heatsink fins, a mechanically seized fan, or a fan motor failure can all produce OHF with a functional control board. Check airflow and fan freedom first.

My drive is reporting OBF. Is this the right board?

No. OBF is a braking/overvoltage fault, not a fan fault. The relevant hardware is the brake board VZ3F1113 or the braking resistor/braking unit configuration. Check deceleration time and braking resistor sizing before replacing hardware.