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| Place of Origin | Germany |
| Brand Name | SIEMENS |
| Certification | CE ROHS |
| Model Number | 6SE7033-7EH84-1GF0 |
Part Number: 6SE7033-7EH84-1GF0
Manufacturer: Siemens AG (Germany)
Product Type: Inverter Wiring Board — SMU2 (Signal Measurement Unit 2)
Product Range: SIMOVERT MASTERDRIVES 6SE70
Compatible Drive: 6SE7033-7EH series chassis drives
The 6SE7033-7EH84-1GF0 is the SMU2 (Signal Measurement Unit 2) inverter wiring board for the Siemens SIMOVERT MASTERDRIVES 6SE7033-7EH chassis drives.
In the MASTERDRIVES large-chassis architecture, the internal power section requires a dedicated interface board to route the gate drive signals from the control electronics to the IGBT modules, and to return the analogue measurement signals — current, voltage, and temperature — back to the control stage. The SMU2 board is the assembly that handles this bidirectional signal routing for this specific drive variant.
The 6SE7033-7EH series sits in the upper power range of the MASTERDRIVES 6SE70 chassis lineup.
These drives operate at 380–460V AC and handle output currents in the high hundreds of amperes, corresponding to drive applications in the 200kW-and-above class.
At these power levels, reliable signal integrity between the control and power sections is critical — a wiring board fault does not merely degrade performance, it prevents the drive from producing a controlled output at all.
The GF0 suffix identifies the specific board revision for the SMU2 function within the 6SE7033-7EH drive family.
The 94V-0 PCB rating indicates that the board's substrate meets UL 94 V-0 flame-retardancy requirements — the highest standard in that classification for flame resistance in vertical burn testing.
This rating is specified for industrial drive boards where thermal events in adjacent components must not be propagated through the PCB itself.
| Parameter | Value |
|---|---|
| Part Number | 6SE7033-7EH84-1GF0 |
| Manufacturer | Siemens AG |
| Product Type | Inverter Wiring Board — SMU2 |
| Product Range | SIMOVERT MASTERDRIVES 6SE70 |
| Compatible Drive | 6SE7033-7EH series |
| PCB Flammability Rating | UL 94V-0 |
| Country of Origin | Germany |
The SIMOVERT MASTERDRIVES large-chassis drive divides its power and control electronics across several sub-assemblies.
The main electronics box contains the control boards — the CUVC vector control module, the PMU, option boards, and the PSU1 power supply.
The power section — the IGBT bridge and the DC bus capacitors — occupies the drive's structural frame and heatsink assembly.
Connecting these two sections is the inverter wiring board. The SMU2 board receives the six IGBT gate drive command signals from the control electronics and distributes them to the individual IGBTs via the gate drive connections.
Simultaneously, it collects the analogue measurements from the current sensors, DC bus voltage divider, and IGBT temperature monitoring circuits and routes these measurement signals back to the control electronics for real-time monitoring and feedback.
This signal distribution function requires careful PCB layout — gate drive signals must be routed with controlled impedance and adequate insulation distance from the high-voltage power circuits they run alongside.
The 6SE7033-7EH84-1GF0 board's design reflects Siemens' engineering for this specific chassis size and power level.
The 6SE7033-7EH designates a specific MASTERDRIVES chassis configuration.
The drives in this family are large-format chassis units designed for the most demanding industrial applications: large extruder drives, rolling mill sections, main drive systems in paper machines, powerful pump and fan drives, and test stand applications requiring high-power variable speed control.
The SMU2 board (6SE7033-7EH84-1GF0) is specific to this family.
It is not interchangeable with SMU2 boards from smaller-frame drives (lower current ratings) or from drives in different voltage classes.
Physical dimensions, connector positions, and the electrical specifications of the measurement circuits are matched to the power section characteristics of the 6SE7033-7EH.
SMU2 wiring board failures in MASTERDRIVES chassis drives typically manifest as sudden, unrecoverable drive faults rather than gradual performance degradation.
Common fault codes associated with this board type include overcurrent faults that appear without corresponding motor load, IGBT temperature alarm codes that appear without actual thermal events, and axis faults that point to the power section interface.
Because the SMU2 board's function is signal routing — not computation — failure is usually binary: either the signal path is intact and the drive works, or a connector, trace, or component on the board has failed and the drive does not.
Physical inspection of connectors and solder joints on the board is the first step when a board-level fault is suspected.
Q1: The drive fault log shows repeated F023 (overcurrent) trips at startup but the motor and cables test clean. Could the 6SE7033-7EH84-1GF0 be generating a false overcurrent signal?
A false overcurrent from a wiring board fault is possible. The SMU2 board carries the current measurement signals from the phase current sensors to the control electronics.
An open or shorted measurement path on the board produces an incorrect current reading — sometimes registering maximum current at zero actual load.
Inspect the board's current sense connector seating and signal trace condition.
If the connectors are clean and firm, the SMU2 board is a valid replacement candidate.
Q2: The 6SE7033-7EH84-1GF0 (SMU2) is being replaced. Its companion SML2 board (6SE7033-7EH84-1GG0) is original and untested. Should both boards be replaced at the same time?
If the drive has suffered a fault event — particularly an IGBT fault or overcurrent event — both the SMU2 and SML2 boards should be assessed.
They share the same power section environment and are both exposed to transient energy events. If only the SMU2 shows visible damage, replacing both is still advisable on older high-run-hour machines where the second board's condition is uncertain.
On newer machines with an isolated SMU2 failure, replacing only the confirmed faulty board is acceptable.
Q3: After installing a replacement 6SE7033-7EH84-1GF0, the drive runs but shows a temperature warning on phase V IGBT only. Is the replacement board potentially faulty?
An IGBT temperature warning on one phase after board replacement often indicates that the temperature sensor connector for that phase — located on the SMU2 board — was not fully seated during installation.
Power down, discharge the DC bus, and recheck the temperature sensor connector for the V-phase IGBT on the replacement board.
A partially inserted connector produces an out-of-range resistance reading that the control electronics interprets as a temperature alarm.
Q4: Is the 6SE7033-7EH84-1GF0 interchangeable with the SMU2 board from a 6SE7033-7EG series drive?
No. The 6SE7033-7EH and 6SE7033-7EG series use SMU2 boards matched to their respective power section configurations. Board dimensions, connector layouts, and the electrical specifications of the measurement circuits differ between chassis variants.
Always match the wiring board part number exactly to the drive's chassis type.
Using a board from a different series risks both drive malfunction and potential damage to the measurement circuits.
Q5: The original SMU2 board has a 94V-0 PCB rating. A non-OEM replacement is offered at lower cost but the PCB rating is unknown. Is this an acceptable substitution?
The 94V-0 rating is a safety requirement for industrial drive environments, not a cosmetic specification. Non-OEM boards with unknown PCB flammability ratings should be avoided in high-power drive applications.
In the event of a thermal fault in the drive, a non-rated PCB board may propagate combustion where a 94V-0 rated board would not.
Always use boards with confirmed 94V-0 certification when replacing components in power electronics equipment.
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