Siemens SIMOVERT MASTERDRIVES: electronic boards and spare parts 6SE7090 and 6SY70

When a SIMOVERT MASTERDRIVES fails, the problem is often not the whole converter but a single board or power component. Knowing how to identify boards and spare parts makes it possible to act in a targeted way, with lower time and cost than replacing the complete unit.

Electronic boards have part numbers starting with 6SE7090, power spare parts with 6SY70. The E-Repair catalogue covers more than 90 part numbers of this type, valid for both Vector Control and Motion Control.

🧠 Control boards

• CUVC: control of MASTERDRIVES Vector Control units.
• CUMC and CUMC Performance 2: control of MASTERDRIVES Motion Control units.
• CU1, CU2, CU3: control boards of earlier generations, still found on many units in service.
• CUR and CUSA: control of supply units, rectifier/regenerative units and Active Front End.

The control board holds the firmware and parameters: before replacing it, it is essential to save them or make sure they are available.

🔗 Communication and expansion

• Fieldbus: CBP and CBP2 (PROFIBUS), CBC (CAN), CBD (DeviceNet), CB1 and CB2.
• Drive-to-drive link: SLB (SIMOLINK), SCB1 and SCB2 (serial interfaces), SCI1 and SCI2 (serial I/O modules).
• Terminal expansion: EB1 and EB2.
• Encoders and tachometers: modules for incremental encoders, resolvers and multiturn encoders, DTI, ATI and TSY interfaces.
• Technology boards: T100 and T300, with SE300 terminal block.
• Operator panels: built-in PMU, OP1 and OP1S with parameter memory.

⚡ Internal power electronics

Chassis units and the larger sizes contain boards that link the control section to the power section:

• PSU2 internal power supplies
• power and inverter interfaces (IVI, IPI), voltage dividers (VDU)
• SML3 and SMU3 snubber modules and ABO normalisation modules
• control and precharge modules (PET1) and power output modules (PEU)

🔩 6SY70 power spare parts

• IGBT modules and line-side thyristor modules
• Complete DC link capacitor banks with frame
• Fans, for example for the Compact PLUS version
• Fuses and fan capacitors

Capacitors and fans are the components that age the most: replacing them preventively is part of refurbishment and genuinely extends the life of the drive.

🔍 Examples from the catalogue

👉 6SE7090-0XX84-0AB0 – CUVC control board

👉 6SE7090-0XX84-0AD1 – CUMC control board

👉 6SE7090-0XX84-6FF5 – CBP2 PROFIBUS communication board

👉 6SE7090-0XX84-0FB0 – resolver encoder module

👉 6SE7038-6GL84-1JA0 – PSU2 internal power supply

👉 6SY7000-0AD76 – DC link capacitors with frame

👉 Search the catalogue: 6SE7090 · 6SY70

🛠️ E-Repair services for MASTERDRIVES boards and spare parts

As Approved Partner Siemens – Industry Services, E-Repair works both on individual boards and on the complete unit:

🔧 Component-level repair of control, communication and power boards in E-Repair's certified in-house laboratory, where technically feasible.

♻️ Refurbishment of the unit with replacement of components subject to ageing, such as capacitors and fans, and functional testing.

🚚 Advance replacement with a refurbished or new board or unit, if available in stock and after a compatibility check.

💾 Support in saving and restoring parameters when replacing control boards.

✅ Standard 12-month warranty on the services for which it applies, extendable up to 24 months under the applicable conditions.

❓ Frequently asked questions

✔️ Is it better to repair the board or the whole converter?

If the fault is limited to one board, a targeted repair is usually faster and cheaper. The E-Repair diagnosis shows whether the problem also involves other parts of the unit.

✔️ Can a CUVC replace a CUMC?

No: the two boards control different series (Vector Control and Motion Control) with different firmware. Always check the full part number of the installed board.

✔️ What is needed to replace a control board?

The full part number of the board and of the unit, the firmware version if known and a parameter backup, for example via OP1S or commissioning software.

📚 Further reading

👉 SIMOVERT MASTERDRIVE range

👉 SIMOVERT MASTERDRIVES Vector Control 6SE70

👉 SIMOVERT MASTERDRIVES Motion Control 6SE70

ℹ️ The information provided is general and indicative. Before purchase, installation or commissioning, check the data against the official Siemens documentation or contact E-Repair.