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Siemens SIMOVERT MASTERDRIVES Motion Control 6SE70
SIMOVERT MASTERDRIVES Motion Control units are Siemens high-dynamic servo drives for synchronous servomotors, with part numbers starting with 6SE70. They are widely used on packaging, printing and textile machines, in material handling and wherever fast, precise axes are needed.
Like the Vector Control series, they have been replaced by the SINAMICS platform but are still in service in a great many plants. The E-Repair catalogue covers 229 Motion Control part numbers, all of which can be assessed for repair.
⚙️ What sets Motion Control apart
- Dynamic control of position, speed and torque, designed for synchronous servomotors such as the SIMOTICS 1FK6 and 1FT6 series.
- CUMC control board, different from the CUVC used in Vector Control units.
- Optional technology functions for positioning and synchronism between axes.
- Multi-axis architecture: several inverters connected to a common DC bus, fed by a rectifier or a regenerative unit.
Vector Control and Motion Control are not interchangeable, even when the power rating is the same: the full part number on the rating plate must be checked before any replacement.
🔩 Design versions and Performance 2
- Compact PLUS (IP20): the smallest sizes, very common on multi-axis machines. In the catalogue: 49 part numbers.
- Compact (IP20): medium power ratings. In the catalogue: 86 part numbers.
- Chassis / built-in units (IP00): the highest power ratings, up to 500 kW. In the catalogue: 54 part numbers.
Many part numbers exist as a converter fed from the three-phase mains or as an inverter on a DC bus (DC 510–650 V). The E-Repair catalogue also includes 61 part numbers with water cooling.
The Performance 2 version (42 part numbers in the catalogue) is the later evolution of the series, with higher-performance control electronics: here too, compatibility must be checked before a replacement.
🔌 Rectifiers and regenerative units
On multi-axis machines, Motion Control inverters are fed by dedicated units:
- Rectifier units, which feed the common DC bus.
- Rectifier/regenerative units, which return braking energy to the mains.
- Active Front End (AFE), with its own control board.
In the catalogue these units have part numbers with suffixes such as EP85 or EC85, for example 6SE7024-1EP85-0AA1 or 6SE7024-1EC85-1AA0. A fault in the supply unit stops every connected axis: this makes it one of the most critical components to keep under control.
🔍 How to read the 6SE70 roots
| Root | Examples from the E-Repair catalogue |
| 6SE701x | Compact PLUS and Compact, from 1.5 to 8 A, power up to about 3 kW |
| 6SE702x | Compact PLUS and Compact, from about 10 to 72 A, power from about 4 to 37 kW, plus supply units and accessories |
| 6SE703x | Built-in Chassis units and large supply units, from about 90 to 860 A, power up to 500 kW |
| 6SE7090 | Boards and electronics: CUMC control, PROFIBUS communication, modules for regenerative units |
Some product page examples:
👉 6SE7011-5EP50 – Compact PLUS converter
👉 6SE7016-1TA51 – Compact inverter
👉 6SE7024-1EC85-1AA0 – rectifier/regenerative unit
👉 6SE7090-0XX84-0AD1 – CUMC control board
⚠️ Typical faults
- DC bus capacitors degraded after many years of service
- power modules (IGBTs) damaged by overloads or short circuits on the motor
- faults in the supply unit or regenerative unit, which stop the whole machine
- communication or encoder problems between drive and servomotor
- worn fans and overtemperature
Before any intervention, it is advisable to note down the fault message and save the parameters, especially when positioning or synchronism functions are active.
🛠️ E-Repair services for SIMOVERT MASTERDRIVES Motion Control
As Approved Partner Siemens – Industry Services, E-Repair supports the production continuity of plants running MASTERDRIVES Motion 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, 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 Motion 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 fit a Performance 2 version in place of a standard one?
Not always without checks: control electronics, firmware and parameters may differ. The full part number of the installed unit and the machine configuration must be checked.
✔️ If the supply unit fails, do all axes stop?
Yes, in configurations with a common DC bus the supply unit feeds all connected inverters. This is why it is worth considering a spare unit or an advance replacement service.
✔️ 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.
📚 Further reading
👉 SIMOVERT MASTERDRIVES Vector 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.
