Schneider NHA86312-00 Fan Control Board – ATV600 High-Power Tested

What Is the NHA86312-00 Fan Power Control Board?

The Schneider NHA86312-00 is the fan power and control board used in high-power Altivar ATV610, ATV630, and ATV930 drives, covering the 220–315 kW range (commonly associated with size 6 / 315 kW frames). It carries the spare-part designation VX4VP1400. Its function is to regulate and supply power to the heatsink cooling fans, translating the drive’s thermal management commands into fan speed and on/off control. In ATV610/630/930 drives, the fan mode can be configured as Standard (fan active whenever the motor is running), Always (fan permanently active), or Economy (fan activates based on the drive’s internal thermal state). The fan control board is the hardware that executes this logic.

This is a power-management module for the cooling system, not the fan assembly itself and not the main control board. Supplied as a tested replacement unit, it is intended for cases where the fan control board is confirmed faulty, or where fan operation is abnormal despite a serviceable fan and clean airflow path.

Technical Specifications

Important Diagnostic Boundary: The NHA86312-00 is not the fan itself. It is the electronic board that powers and controls the fan. If the drive trips on OHF, the correct diagnostic sequence is to first confirm whether the fan is physically running, whether the impeller is blocked or contaminated, and whether the airflow path is clear — before concluding the fan control board is defective. A dead fan and a faulty control board produce the same OHF symptom from the drive’s perspective.

When to Investigate or Replace the NHA86312-00 Board

The fan control board becomes the primary suspect under these conditions:

• OHF fault with no fan rotation — the drive reports overheat, and the heatsink fan is confirmed not spinning despite the drive being powered and the fan mode set to Standard or Always. If the fan spins freely by hand and receives no drive voltage, the control board is implicated.
• Fan speed / control abnormality — the fan runs at a fixed speed regardless of thermal state, or does not respond to the configured fan mode (Standard / Always / Economy).
• Visible damage on the board — burn marks, failed power components, or damaged connectors on the fan control board.
• OHF persists after fan and airflow checks — fan spins freely, airflow path is clean, ambient temperature is within derating limits, but the drive still reports thermal state rising abnormally; the control board’s regulation function should then be verified.

Critical caution: Before replacing the board, confirm the fan motor itself is serviceable (free rotation, no bearing noise, no physical obstruction) and that the heatsink fins and airflow path are not clogged. A blocked or worn fan will cause OHF even with a perfectly functional NHA86312-00.

Compatibility & Verification

Before ordering, confirm the following:

• Drive model and frame size — this fan control board is associated with high-power ATV610/630/930 models (220–315 kW range). Confirm the exact catalogue number on the drive nameplate, as fan control hardware varies by frame size.
• Original board marking — confirm the existing board reads NHA86312-00, and check whether the spare-part marking VX4VP1400 is also present.
• Fan physical condition — confirm the fan spins freely and the airflow path is clear before ordering a control board replacement.
• If uncertain, send a photo of the drive nameplate and the original fan control board label for review before purchase.

Frequently Asked Questions

Does the NHA86312-00 include the fan itself?

No. It is the fan power and control board only. The heatsink fan assembly is a separate component. Confirm whether the fan motor or the control board is faulty before ordering.

Does OHF always mean the fan control board is faulty?

No. OHF is triggered when the drive’s thermal state reaches 118%. A blocked fan impeller, a worn fan motor, clogged heatsink fins, or high ambient temperature can all produce OHF with a perfectly functional NHA86312-00. Check the fan’s physical operation and airflow path first.

Can the fan mode be changed on ATV610/630/930?

Yes, on supported firmware versions the fan mode can be set to Standard, Always, or Economy in the drive’s maintenance menu. If the fan does not respond to these settings, the control board or fan wiring should be investigated