AC servo drive
Omron 1S servo drives
EtherCAT servo drives from 50 W to 1.5 kW on 230 V single-phase and 400 W to 15 kW on 400 V three-phase, with hardwired STO to SIL 3 / PL e and network STO to SIL 2 / PL d; variants add SS1/SLS or full motion safety.
Key specifications
| Power | 50–15,000 W |
|---|---|
| Supply | 1~ 230 V AC (to 1.5 kW); 3~ 400 V AC (0.6–15 kW) |
| Fieldbus | EtherCAT |
| Resolution (max) | 23 bit |
| Safety | variants with SS1/SLS (SIL 2/PL d) or motion safety SS1, SS2, SOS, SLS, SLP, SDI, SBC (SIL 3/PL e) |
| Safe torque off | hardwired STO SIL 3 / PL e; network STO SIL 2 / PL d |
Summarised in our own words from OMRON Corporation's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Specify Motion is not affiliated with OMRON Corporation. Omron and 1S servo drives are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with an Omron part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 2 series from our supply network are the closest match on published figures.
Leadshine's EL7 platform spans 220 VAC drives from 400 W to 2 kW, 400 VAC drives to 7.5 kW and an 11-22 kW high-power range, all with STO and EtherCAT, Modbus/pulse or PROFINET variants.
| Published maximum | 1S servo drives | EL7S / EL7 Series AC Servo Drives |
|---|---|---|
| Continuous current | — | 44 A |
| Peak current | — | 88 A |
| Power | 15,000 W | 22,000 W meets or exceeds |
| Axes | — | 1 |
Network-capable AMC digital drives spanning 10-747 VDC and 120-480 VAC, up to 150 A continuous and 250 A peak (27.4 kW peak power), in PCB, panel, machine and vehicle formats. They support almost any motor type and feedback, plus CANopen, EtherCAT, POWERLINK and Modbus.
| Published maximum | 1S servo drives | DigiFlex Performance Servo Drives (DP,… |
|---|---|---|
| Continuous current | — | 150 A |
| Peak current | — | 250 A |
| Power | 15,000 W | 27,400 W meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
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 Omron 1S servo drives
Send these with your enquiry and an engineer can confirm the right 1S servo drives 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
Omron 1S servo drives: frequently asked questions
What is the Omron 1S servo drives?
EtherCAT servo drives from 50 W to 1.5 kW on 230 V single-phase and 400 W to 15 kW on 400 V three-phase, with hardwired STO to SIL 3 / PL e and network STO to SIL 2 / PL d; variants add SS1/SLS or full motion safety. Published series figures include power 50 W, power 15,000 W, resolution 23 bit. It is made by OMRON Corporation; Specify Motion can help source it or propose an equivalent.
Who makes the Omron 1S servo drives?
The Omron 1S servo drives is made by Omron (OMRON Corporation) and is listed here for engineers comparing options. Specify Motion is not affiliated with OMRON Corporation; brand names are used only to identify the product.
What is the power of the Omron 1S servo drives?
The published series minimum power is 50 W. Individual models and sizes in the 1S servo drives 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 Omron 1S servo drives?
Yes. On published figures, Leadshine EL7S / EL7 Series AC Servo Drives and ADVANCED Motion Controls DigiFlex Performance Servo Drives (DP, DZ, DV) are the closest match from our supply network. 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
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