Original Siemens Optical Fibre Board Cib Comm. Component 6SL3351-6FE35-0AA1 6SL33516FE350AA1 6SL3351-6FE35-OAA1

Siemens 6SL3351-6FE35-0AA1 | MICROMASTER 430 Replacement Control Interface Board — 380–480V, 490A, 50/60Hz

Part Number: 6SL3351-6FE35-0AA1

Manufacturer: Siemens AG (Germany)

Product Type: Replacement Control Interface Board (Spare Part — PX Series)

Brand / Range: MICROMASTER 430 (Subrange: 430)

Voltage: 380–480V 3AC

Current Rating: 490A

Frequency: 50/60 Hz

Compatible Drive Type: AC Drive / MICROMASTER 430 Power Module

Country of Origin: Germany

Overview

The 6SL3351-6FE35-0AA1 is a Siemens MICROMASTER 430 replacement control interface board — a PX series spare part designed to restore the control electronics of MICROMASTER 430 drives operating at 380–480V three-phase AC with a 490A power rating.

This board forms the control intelligence of the drive's power module: it handles IGBT gate drive signals, current and voltage feedback processing, protective monitoring, and the interface between the drive's power stage and its control electronics.

MICROMASTER 430 is Siemens' specialist drive for pump and fan applications — a focused product within the broader MICROMASTER family that brings energy savings, process control integration, and application-optimised software to high-volume pumping and ventilation installations.

The MM430 found wide deployment in water treatment facilities, HVAC systems, industrial process pumping, and building services.

At the 490A rating, the 6SL3351-6FE35-0AA1 serves the upper end of the MM430 power range, where motors in the 200–250kW range on 380–480V networks require controlled variable-speed operation.

The 6SL3351 series is Siemens' PX replacement component designation for control interface boards within the MICROMASTER and SINAMICS drive product lines.

The suffix 6FE indicates the MICROMASTER 430 family within this series, the 35 sub-designation identifies the 490A current rating, and AA1 is the revision level. 

The board is a direct replacement spare for failed control interface boards in the installed base of MM430 drives at this power rating.

Key Specifications

MICROMASTER 430 — The Pump and Fan Drive

The MICROMASTER 430 was designed from the start for the specific demands of centrifugal pump and fan applications. Centrifugal loads follow the affinity laws — where shaft power scales with the cube of speed.

A centrifugal pump running at 80% of its maximum speed consumes only about 51% of its rated power.

The MM430's control software takes full advantage of this characteristic: its energy-optimisation functions track the minimum motor flux needed for the actual load, reducing losses compared to a fixed-voltage drive operating below full load.

For pump applications specifically, the MM430 includes pipe fill and anti-condensation functions, multi-pump cascade control for parallel installations, and PID control with sleep and wake functions for pressure or flow maintenance in systems with variable demand.

These application-specific capabilities made the MM430 a well-suited choice for building services, water utilities, and industrial process systems.

The 6SL3351-6FE35-0AA1 serves these drives at their highest power ratings — the physical size E or F chassis drives where the power module houses the full IGBT inverter stage for motor currents up to 490A.

At this scale, the drives are typically used for large centrifugal pumps and fans in industrial and municipal infrastructure.

Control Interface Board Function

Within the MICROMASTER 430 power module, the control interface board bridges the drive's digital control electronics and its IGBT power stage. It receives PWM switching commands from the drive's control unit and translates them into gate drive pulses for the power module's IGBTs.

The current sensing section samples the actual motor phase currents at high frequency, returning these readings to the control loop for closed-loop vector or V/f control. Temperature sensors on the heatsink connect through this board, providing the thermal monitoring data that enables the drive's derating and shutdown protection.

The board also implements the protective functions local to the power module — DC bus overvoltage detection, IGBT desaturation sensing, and overcurrent shutdown — all of which must respond faster than any software can, happening at the hardware level on the 6SL3351-6FE35-0AA1 board itself.

Replacement and Service

When a MICROMASTER 430 power module generates fault F0004 (drive inverter overtemperature), F0021 (ground fault), or F0022 (output phase loss), and the external cause has been ruled out, the 6SL3351-6FE35-0AA1 is a primary suspect.

Current sensing circuit failures produce incorrect phase current readings that trigger overcurrent shutdowns without genuine motor overload. Gate drive failures produce asymmetrical motor currents and drive faults.

Board replacement requires powering down the drive, waiting for the DC bus to discharge below 50V (a minimum 5-minute waiting period), and carefully disconnecting all internal board connectors before removal.

After installation, the drive should be recommissioned following the standard MM430 startup procedure to verify all parameters and protections are correctly configured.

FAQ

Q1: The MICROMASTER 430 trips on F0022 (output phase loss) but all three output cables are confirmed connected and undamaged. Could the 6SL3351-6FE35-0AA1 be the fault?

F0022 with confirmed-good cabling suggests either a motor winding fault or a current sensing failure on the control board. Remove the motor cables from the drive output and run the drive briefly at low speed with no motor connected — if F0022 persists with no motor, the current sensing section of the 6SL3351-6FE35-0AA1 has failed.

If the fault only appears with the motor connected, investigate the motor windings for phase imbalance.

Q2: The MICROMASTER 430 drive at 490A rating runs normally but generates occasional nuisance overcurrent trips F0001 at low load, clearing when the drive is reset. Is the control board failing?

Intermittent F0001 at low load with confirmed-good motor is a classic sign of aging current sensing components on the control board — a drifted current offset that causes the measured current to briefly exceed the trip threshold even when actual motor current is well within limits.

This becomes more pronounced as the board warms up. It is progressive and will worsen over time.

Board replacement is the recommended action before the trips become frequent enough to disrupt production.

Q3: The replacement 6SL3351-6FE35-0AA1 has arrived and the original was revision AA0. The new board is AA1. Is this a concern?

Revision AA1 is compatible with and supersedes AA0. Siemens maintains functional compatibility across revisions of the same base part number. No additional commissioning steps are required.

The drive can be powered on and returned to service without parameter changes after physical board replacement.

Q4: The drive size at 490A on 400V corresponds to approximately 250kW. Is the 6SL3351-6FE35-0AA1 specific to a particular power module chassis size?

The 6SL3351-6FE35-0AA1 is specific to the power module that carries the 490A current rating in the MICROMASTER 430 product range. Drives at this power level use a chassis of defined physical dimensions with a specific cooling configuration.

The board is matched to the physical layout, connector positions, and IGBT configuration of that chassis — it cannot be used in power modules of different current ratings or chassis sizes even if they are otherwise from the same MICROMASTER 430 family.

Q5: Is the MICROMASTER 430 still supported with spare parts like the 6SL3351-6FE35-0AA1, given that the MM430 has been superseded by SINAMICS G120?

Siemens continues to supply spare parts for installed MICROMASTER 430 drives under its spare parts lifecycle programme. The 6SL3351-6FE35-0AA1 remains available through Siemens' spare parts channels and the aftermarket.

For long-term planning, machines running MM430 drives at end-of-service life may be candidates for drive upgrade to SINAMICS G120, which requires re-engineering the control wiring and recommissioning but significantly extends the drive system's supportable life.