Schneider NHA37568A02 Control Board – Tested ATV930/340 Main

When This Board Is the Suspect

The control board becomes the replacement target when internal processing or communication faults persist after simpler checks:

• InFr — the CPLD on the control card detects an abnormal signal acquisition. Common causes include interference from start/stop commands synchronized with the cooling fan, poor ribbon connection between the control board and the power board due to vibration, or abnormal voltage/current feedback from the power board. 
• InF6 / InF8 — internal errors possibly involving software incompatibility between the power board and the control module, invalid power board rating, or abnormal internal 24 V / 5 V control rails. Measure the control supply rails and verify the power board model matches before replacing the board.
• No display / fails to initialize — power is present, but the control board does not boot. Confirm the control-side supply is stable before concluding the board is faulty.

Compatibility Check

Before ordering, confirm:

• Drive series — confirm the drive is ATV930, ATV330, or ATV340. This board is not for ATV61/71 or ATV610/630.
• Original board marking — confirm the existing board label reads NHA37568A02.
• Fault context — confirm the active fault is an InF-series internal error (InFr, InF6, InF8). If the fault is a terminal-level symptom (NST, SPF), the relevant part is likely the terminal board, not the main control board.
• If unsure, send a photo of the original board label and the drive nameplate before purchase.

FAQ

Does InFr always mean the NHA37568A02 board is faulty?

No. InFr (Internal Error 27) indicates the CPLD on the control card has detected an abnormal signal acquisition. Schneider’s guidance lists interference, poor ribbon connection between the control board and power board, and abnormal power-board feedback signals as primary causes. Reseat the ribbon and check shielding/grounding before replacing the board.

Is NHA37568A02 compatible with all ATV930 power ratings?

Not automatically. “All versions” must be verified against the specific drive MLFB. Different ATV930 power ratings may use different hardware configurations. Confirm the nameplate before ordering.

Is this the terminal board or the main control board?

It is the main control (CPU) board. The terminal I/O interface is a separate board or cassette and serves a different function.

Condition & Dispatch

This board is supplied as Tested stock. Inspection covers connector condition and PCB appearance. Photographic records are available on request before dispatch.