Original Siemens MM440 Inverter/Converter 45KW-75KW RC Absorption Board A5E00677666 A5EOO677666

A5E00677666 | Siemens MICROMASTER MM4F RCC5 Board — 45–75kW / 400V / Frame F / 6SE64 MICROMASTER 430 and 440 Spare

MICROMASTER MM4 — The 6SE64 Drive Series

The A5E00677666 is a spare circuit board for the Siemens MICROMASTER MM4 drive series — the 6SE6430 (MICROMASTER 430) and 6SE6440 (MICROMASTER 440) variable speed drive families. The "MM4F" designation identifies the specific drive frame size this board serves:

Frame F: The Frame F designation in the MICROMASTER range corresponds to the 45–75kW power class at 400V AC — the frame size covering the upper-mid power range of the MICROMASTER series. Frame F drives are physically larger than the lower-power Frame C and D variants, accommodating the higher-capacity power electronics required for 45–75kW output.

Key Specifications

45–75kW / 400V — Frame F Drive Applications

At 45–75kW and 400V AC, the MICROMASTER Frame F drives serve substantial industrial motor applications:

45kW drives: Large fans, centrifugal pumps above 37kW, conveyor main drives, industrial compressor starters.

55kW drives: Mid-range machine tool main drives, high-power HVAC fan control, process pump applications in water treatment and industrial fluid transfer.

75kW drives: Upper-range Frame F — large industrial fan and pump systems, significant conveyor or hoist drives, and the highest-power applications within the MICROMASTER range before transitioning to larger drive product families.

Application Scenarios

MM4F RCC5 fault in 55kW MICROMASTER drive: A MICROMASTER 430 drive at 55kW / 400V (Frame F) develops drive-level faults. After checking the motor and external wiring, A5E00677666 is identified as the faulty circuit board. Replacement restores correct drive operation.

75kW MICROMASTER 440 board replacement: A MICROMASTER 440 Frame F drive at 75kW undergoes planned maintenance. A5E00677666 is replaced as part of the drive's internal board renewal programme.

FAQ

Q1: How do I confirm A5E00677666 is the correct board for my MICROMASTER MM4 drive?

Check the installed board's part number label inside the drive. If it reads A5E00677666, this is the confirmed replacement. Verify the drive's frame size is Frame F and the power rating is in the 45–75kW range at 400V — the board's power class must match. The internal board reference 620361950501 also identifies this specific board.

Q2: Does A5E00677666 serve both the MICROMASTER 430 and the MICROMASTER 440?

Yes — A5E00677666 is confirmed for the 6SE64 MM4 series, which includes both the MICROMASTER 430 (6SE6430) and MICROMASTER 440 (6SE6440). Despite the 430 and 440 having different control software and feature sets, they share the same Frame F power electronics hardware at the 45–75kW / 400V power class — and therefore the same RCC5 circuit board.

Q3: What drive fault symptoms indicate an A5E00677666 failure?

Board faults in the MICROMASTER MM4 produce specific fault codes on the drive's display or via the BOP-2 operator panel. Faults pointing to the RCC5 board typically involve rectifier control, DC bus management, or internal power circuit monitoring — distinct from motor protection faults (overcurrent, overtemperature) which indicate external causes. If the motor and external wiring test correctly but the drive consistently generates internal hardware faults, the RCC5 board is the diagnostic focus.

Q4: Does replacing A5E00677666 require re-commissioning the MICROMASTER drive?

MICROMASTER drive parameters are stored in the control board's memory — not in the RCC5 circuit board. Replacing A5E00677666 does not affect stored parameters. After fitting the replacement, power up the drive and verify it completes self-test before enabling the motor. If any parameter values were affected by the original fault, restore from a backup before returning to production.