Original Siemens Cib Comm. Component 6SL3351-6GH31-5AB3 6SL33516GH315AB3 6SL3 351-6GH31-5AB3

Siemens 6SL3351-6GH31-5AB3 | SINAMICS G Replacement Control Interface Board — 660–690V, 145A, 50/60Hz

Part Number: 6SL3351-6GH31-5AB3

Manufacturer: Siemens AG (Germany)

Product Type: Replacement Control Interface Board (Spare Part)

Product Family: SINAMICS G (6SL3351 spare part series)

Compatible Unit: SINAMICS G Power Module, 660–690V 3AC, 145A 

Overview

The 6SL3351-6GH31-5AB3 is a Siemens SINAMICS G replacement control interface board — a spare part for restoring the control electronics of a SINAMICS G Power Module operating on 660–690V three-phase AC at a rated current of 145A.

The board is the control layer within the drive's Power Module: it generates the gate drive signals for the IGBT transistors, processes motor current feedback from the Power Module's sensing circuits, monitors the heatsink temperature, and implements the local protective shutdown functions.

The SINAMICS G platform targets industrial variable-speed drive applications where robust, reliable motor speed control is the priority — pump and fan control, compressor drives, conveyor systems, and general-purpose industrial AC motor speed regulation.

At the 660–690V supply level, SINAMICS G serves industrial sites where the local distribution network operates at the higher voltage levels common in certain industrial networks, particularly in larger industrial facilities, process plants, and facilities in regions where 690V is the standard industrial network voltage.

At 145A on 690V, the 6SL3351-6GH31-5AB3 serves motors in the 132kW range — a common power level for medium-sized industrial pumps, fans, and compressors.

These motor sizes are frequent in water treatment infrastructure, HVAC systems for large buildings, industrial process cooling, and pneumatic conveying systems.

Key Specifications

SINAMICS G Drive Architecture at 660–690V

The SINAMICS G drive at 660–690V operates on the same fundamental architecture as the lower voltage variants but is configured for the higher network voltage. The Power Module rectifies the 660–690V AC supply to a DC bus voltage of approximately 930–975V DC for a 690V supply.

This higher DC bus voltage means the IGBT devices in the power stage operate at higher voltage levels, and the control interface board's gate drive section must be designed for these conditions.

The control interface board handles the gate drive timing precisely. Imprecise gate timing at the kilowatt power levels involved in a 145A, 690V drive creates significant losses and can produce resonances in the motor current that generate acoustic noise and additional motor heating.

Siemens' board design optimises the switching parameters for the specific IGBT module in the Power Module, giving clean switching waveforms and efficient operation.

The 6SL3351-6GH31-5AB3 is the AB3 revision — the fourth revision of this board (AB0 through AB3).

Each revision incorporates component updates. AB3 is the current production version and is the recommended spare for all field replacements, regardless of which earlier revision was originally installed.

690V Networks — Application Context

The 660–690V supply range is used where the IEC standard 690V nominal voltage is prevalent — common in larger industrial sites in Europe, the Middle East, and parts of Asia.

At 690V, the same motor size draws lower current for the same power output compared to 400V operation, which means smaller cross-section supply cables and lower cable losses. For large installations with many drives, this makes 690V an economically attractive network voltage.

The SINAMICS G at 660–690V brings the same application-optimised drive functionality — energy-saving modes, PID control, multi-pump cascade control, kinetic buffering — to high-voltage network environments.

The 6SL3351-6GH31-5AB3 is the spare board that keeps these drives operational when the control electronics require replacement.

Revision History and Interchangeability

The 6SL3351-6GH31-5 series boards (145A, 660–690V) have been produced in four revisions: AB0, AB1, AB2, and AB3. Each is a direct replacement for its predecessor.

The part number suffix changes with each revision: -5AB0, -5AB1, -5AB2, -5AB3.

The AB3 board is fully interchangeable with all earlier revisions as a replacement in installed drives. When servicing a drive that originally contained an AB0 or AB1 board, the AB3 can be installed without any additional commissioning steps.

The AB3 may include updated components for improved long-term reliability and updated thermal management circuitry, but its functional interface to the Power Module is identical across all revisions.

Installation Safety — 690V Hazard

The 6SL3351-6GH31-5AB3 is installed in a Power Module that connects to a 660–690V AC supply. Even after mains isolation, the DC bus capacitors retain significant charge.

At 690V supply, the DC bus charges to approximately 975V — a lethal voltage. 

The mandatory discharge waiting period (minimum five minutes after mains isolation) must be observed and the DC bus voltage must be measured and confirmed below 50V before any internal access.

Always work with appropriate electrical insulation — insulated tools, appropriate PPE for the voltage level, and adherence to site electrical safety procedures.

Handle the board with anti-static precautions (ESD wrist strap, conductive work surface) to prevent electrostatic damage to the gate drive and sensing ICs.

FAQ

Q1: The SINAMICS G drive at 145A / 690V shows an F30001 fault (overcurrent) with no motor connected. Is the 6SL3351-6GH31-5AB3 at fault?

F30001 with no motor connected means the drive is detecting current in the output circuit when no current should flow. With confirmed-open output terminals, this is a current sensing fault within the control board.

Measure the DC bus voltage to confirm it is within specification. 

If supply is correct and the fault persists with open output terminals, the current sensing circuitry on the 6SL3351-6GH31-5AB3 has failed.

Q2: The installed board is revision AB0. The available replacement is AB3. Is this a direct drop-in swap?

Yes. AB3 directly replaces AB0, AB1, and AB2. No parameter changes, no reconfiguration, and no additional commissioning steps are required due to the revision change.

Siemens maintains this interchangeability across revisions to simplify field maintenance.

Q3: After the board replacement, the drive shows F30017 (Heatsink overtemperature) at moderate load. The cooling fan is confirmed running. What should be checked?

Post-replacement heatsink temperature faults often trace to an incorrectly reseated NTC temperature sensor connector.

The NTC connector plugs onto the control board — if it was not firmly reseated during installation, the temperature reading may be incorrect (too high, causing false shutdown) or open circuit (defaulting to a maximum temperature alarm). Re-check all connector seating on the 6SL3351-6GH31-5AB3, particularly the NTC sensor connection.

Q4: The drive is in a coastal location with elevated humidity and salt air. Are any special precautions needed for the 6SL3351-6GH31-5AB3?

Standard SINAMICS G control interface boards are not supplied with conformal coating for harsh humid or salt environments. For coastal or high-humidity installations, verify that the drive cabinet provides adequate IP protection and that the cooling air intake does not draw in salt-laden outdoor air.

If the environment is particularly aggressive, consult Siemens about specially treated board variants or additional cabinet protection measures.

Q5: Can the 6SL3351-6GH31-5AB3 (145A, 660–690V) be used in a SINAMICS G Power Module rated for 175A at the same voltage?

No. The control interface board is calibrated for the specific current rating of its compatible Power Module.

The 145A board contains gate drive parameters and current sensing calibration specific to the 145A IGBT module. 

Installing a 145A board in a 175A module would produce incorrectly calibrated current feedback and potentially incorrect IGBT switching timing.

Always match the replacement board to the exact rated current of the installed Power Module.