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Siemens SIMOVERT MASTERDRIVES Vector Control 6SE70
SIMOVERT MASTERDRIVES Vector Control units are Siemens vector-controlled frequency converters for three-phase asynchronous motors, with part numbers starting with 6SE70. For many years they were the standard in plants with pumps, fans, conveyor belts, extruders, rolling lines and paper mills.
The platform that replaced them is SINAMICS, but thousands of MASTERDRIVES Vector Control units are still in service. The E-Repair catalogue covers 281 part numbers in this series, all of which can be assessed for repair.
⚙️ Vector Control and Motion Control: the difference
The MASTERDRIVES family is split into two series with the same power hardware but different control:
- Vector Control (VC): speed and torque control of asynchronous motors, for process applications. The control board is the CUVC.
- Motion Control (MC): dynamic control of synchronous servomotors, for axes and positioning. The control board is the CUMC.
For this reason, before replacing a unit it is essential to check on the rating plate whether it is VC or MC: similar power part numbers can carry different control electronics.
🔩 Design versions
- Compact PLUS (IP20): the smallest sizes, for compact cabinets. In the catalogue: 28 part numbers.
- Compact (IP20): medium power ratings, wall-mounted inside the cabinet. In the catalogue: about 100 part numbers.
- Chassis / built-in units (IP00): the highest power ratings, up to more than 600 kW. In the catalogue: about 120 part numbers.
Each version exists in two configurations:
- Converter: fed directly from the three-phase mains, with integrated rectifier (3 AC 380–480 V, 500–600 V or 660–690 V).
- Inverter: fed from a common DC bus (for example DC 510–650 V or 675–810 V), typical of multi-motor plants.
Many sizes are also available with water cooling (87 part numbers in the E-Repair catalogue) and with options such as the "Safe Stop" function.
🔍 How to read the 6SE70 roots
The first digits of the part number give an approximate indication of the current rating and therefore of the power:
| Root | Examples from the E-Repair catalogue |
| 6SE701x | Compact PLUS and Compact, currents of a few amperes, power from about 0.5 to 4 kW |
| 6SE702x | Compact and first Chassis units, from about 10 to 80 A, power from about 4 to 45 kW |
| 6SE703x | Built-in Chassis units, from about 90 A to more than 800 A, power from about 45 to 630 kW |
| 6SE7090 | Boards and electronics: CUVC control, communication, encoders, operator panels |
👉 Search the catalogue: 6SE701 · 6SE702 · 6SE703 · 6SE7090
Some product page examples:
👉 6SE7011-5EP60 – Compact PLUS converter
👉 6SE7016-1EA61 – Compact converter
👉 6SE7090-0XX84-0AB0 – CUVC control board
🧩 Electronics and accessories
- CUVC control board: the "brain" of the Vector Control converter. Older units use the earlier CU2 board.
- Communication boards, for example PROFIBUS (CBP2), and encoder modules.
- OP1S operator panel with built-in memory, also useful to save and reload parameters.
- Power accessories: braking resistors and interference suppression filters.
⚠️ Typical faults on units in service for many years
After 15–25 years of operation, the most common problems are not due to the design but to component ageing:
- degraded DC link capacitors, with overvoltage or undervoltage trips
- damaged power modules (IGBTs), with overcurrent or short-circuit trips
- worn fans and resulting overtemperature
- internal power supplies and control boards with intermittent faults
- loss of parameters after faults or replacements, when no backup is available
Always note down the alarm or fault code shown on the panel before switching the unit off: it is the most useful information for diagnosis.
🛠️ E-Repair services for SIMOVERT MASTERDRIVES Vector Control
As Approved Partner Siemens – Industry Services, E-Repair supports the production continuity of plants running MASTERDRIVES Vector Control:
🔧 Component-level repair in E-Repair's certified in-house laboratory, with diagnosis and repair where technically feasible.
♻️ Refurbishment with inspection and replacement of components subject to ageing, such as capacitors and fans, and functional testing according to the agreed scope of work.
🚚 Advance replacement with a refurbished or new product, if available in stock and after a compatibility check.
🛠️ On-site and remote technical assistance for diagnosis and support with recommissioning.
💾 Support in saving and checking parameters before any intervention.
✅ Standard 12-month warranty on the services for which it applies, extendable up to 24 months under the applicable conditions.
❓ Frequently asked questions
✔️ Can a MASTERDRIVES Vector Control still be repaired?
Yes, in the vast majority of cases. E-Repair carries out a diagnosis and assesses a component-level repair; the proposal depends on the fault and on the condition of the unit.
✔️ Can I replace a Vector Control with a Motion Control of the same power?
No, in general they are not interchangeable: control, firmware and type of motor driven are different. The full part number of the installed unit must be checked.
✔️ What should I prepare before sending the unit?
The full part number from the rating plate, the last fault message and, if possible, a parameter backup, for example using the OP1S panel or commissioning software.
✔️ Is it better to repair or migrate to SINAMICS?
It depends on the remaining life of the plant. Often the most efficient choice is to keep the MASTERDRIVES running through repair and refurbishment, and to plan the migration around production schedules.
📚 Further reading
👉 SIMOVERT MASTERDRIVES Motion Control 6SE70
👉 MASTERDRIVES boards and spare parts 6SE7090 and 6SY70
👉 SIMOVERT MASTERDRIVE product catalogue
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.
