AC servo drive
Lenze i950 cabinet servo inverter AC servo drive
Cabinet servo inverter for single and multi-axis motion from 0.37 kW, headlined to 250 kW, on 230/400/480 V mains, with multi-fieldbus options and optional integrated safety up to SIL 3 / PL e.
Key specifications
| Power | 370–250,000 W |
|---|---|
| Supply | 1 AC 230 V; 3 AC 230 V, 400 V, 480 V |
| Feedback | resolver and multi-encoder inputs; one-cable HIPERFACE DSL and EnDat 3 |
| Fieldbus | EtherCAT, EtherNet/IP, PROFINET, PROFIBUS, CANopen; FSoE, PROFIsafe |
| Safety | optional integrated safety up to SIL 3 / PL e Cat. 4 |
| Io | 4 DI, 1 DO, 1 AI base |
Summarised in our own words from Lenze SE's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Highlights state 0.37–250 kW; the technical data table on the page covers 0.37–110 kW.
Specify Motion is not affiliated with Lenze SE. Lenze and i950 cabinet servo inverter are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Engineer support
Speak to our engineers about your project
Our experienced engineers are on hand, ready to help with your project. Whether you need the Lenze i950 cabinet servo inverter itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
- Help sourcing i950 cabinet servo inverter and spares for installed machines
- Modified and custom designs when a catalogue part doesn't fit
- Complete axis: motor, drive, gearing and feedback matched together
What an AC servo drive is
An AC servo drive, or servo amplifier, powers and controls a servo motor from mains supply. It rectifies the AC input to a DC bus, then uses an inverter of power transistors switched by PWM to produce controlled three-phase current in the motor. Nested current, velocity and position loops use encoder feedback to follow commands from pulse and direction, analogue or industrial Ethernet. Modern drives add auto-tuning, vibration suppression and safety functions such as safe torque off.
When engineers choose an AC servo drive
Choose an AC servo drive for mains-powered machines with servo axes from tens of watts to many kilowatts, such as packaging, machine tools and robotics. It gives precise, dynamic control with standard industrial interfaces. The trade-offs are cabinet space, wiring, EMC measures and the need to match motor and feedback. For low-voltage or mobile machines, a DC drive is more suitable; for many axes in one cabinet, a multi-axis drive may save space.
How to specify the Lenze i950 cabinet servo inverter
Send these with your enquiry and an engineer can confirm the right i950 cabinet servo inverter variant or an equivalent:
- Supply voltage and phases (V AC)
- Continuous and peak output current (A rms)
- Motor and feedback compatibility
- Command interface: pulse, analogue, EtherCAT, PROFINET and so on
- Safety functions, such as STO, and their rating (SIL, PL)
- Braking resistor and regenerative energy (W, J)
- Ambient temperature, mounting and cooling
Common mistakes to avoid
- Sizing on motor rated current without the drive's peak duration
- Ignoring regenerative energy on fast decelerations or vertical axes
- Leaving out EMC filtering and screened motor cables
- Mixing motor and encoder types the drive does not support
Lenze i950 cabinet servo inverter: frequently asked questions
What is the Lenze i950 cabinet servo inverter?
Cabinet servo inverter for single and multi-axis motion from 0.37 kW, headlined to 250 kW, on 230/400/480 V mains, with multi-fieldbus options and optional integrated safety up to SIL 3 / PL e. Published series figures include power 370 W, power 250,000 W. It is made by Lenze SE; Specify Motion can help source it or propose an equivalent.
Who makes the Lenze i950 cabinet servo inverter?
The Lenze i950 cabinet servo inverter is made by Lenze (Lenze SE) and is listed here for engineers comparing options. Specify Motion is not affiliated with Lenze SE; brand names are used only to identify the product.
What is the power of the Lenze i950 cabinet servo inverter?
The published series minimum power is 370 W. Individual models and sizes in the i950 cabinet servo inverter range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Lenze i950 cabinet servo inverter?
Yes. Our engineers can propose an equivalent built around your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
Does a servo drive need a braking resistor?
When a servo motor decelerates, it acts as a generator and returns energy to the drive's DC bus. If the bus capacitors cannot absorb it, the voltage rises and the drive trips. A braking resistor dissipates the energy as heat. Fast decelerations, high inertia and vertical axes usually need one.
What is safe torque off on a servo drive?
Safe torque off, or STO, is a safety function that removes power that could produce torque at the motor, without disconnecting the drive supply. It is defined in IEC 61800-5-2 and used as part of a machine's safety system. Check the safety level achieved and wiring requirements.
Further reading: How to select a servo drive · How to select a servo motor · Servo drives
Other ac servo drive series
Spec builder
Specify what you need instead of i950 cabinet servo inverter
Select every part you need, answer the questions an applications engineer would ask, and see your summary before we ask for any details.
- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
Engineer support
Our engineers are ready to help with your project
Tell us about your project and how you use the Lenze i950 cabinet servo inverter: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
- Reviewed by an engineer, not an autoresponder
- Like-for-like and better-fit alternatives
- Standard, modified and custom options
Prefer to configure it? Use the spec builder.