How to Choose Siemens SINAMICS Drives for Motion and Process Equipment
SINAMICS drives are modular systems whose control unit, power module, motor, feedback, line components and engineering data work together. Selecting only by kilowatts can produce nuisance trips, poor torque response or a drive that cannot communicate with the existing PLC.
Define the application and load profile
Classify the axis as a pump, fan, conveyor, spindle, hoist, winder or coordinated motion axis. Record speed range, overload duration, acceleration, braking energy, duty cycle and ambient temperature. For a vertical or regenerative load, include the brake resistor or regenerative supply requirements in the first quote.
A drive for a simple variable-speed fan has a different control and feedback requirement from a coordinated servo axis. Gather the motor nameplate, mechanical load, cable length and machine safety design before comparing part numbers. The Vibocnc product catalog is a useful starting point, and categories can help separate drive, motor and control components.
Distinguish the SINAMICS architecture
Compact G120 installations and modular S120 motion systems are not interchangeable simply because both are branded SINAMICS. Identify the control unit, power module, line module, motor module, braking components and firmware or project file. The replacement must fit the mechanical bus, electrical rating and communication architecture.
Check whether the PLC commands the drive over PROFINET, PROFIBUS, a motion telegram or another interface. Confirm device name, address, telegram, technology object and safety configuration. A power module with the wrong control unit or firmware can leave a healthy motor unavailable to the machine.
Match motor, feedback and braking
Record the motor type, rated current, voltage, speed, encoder, brake and cable. Verify whether the application uses sensorless vector, closed-loop vector or servo control. For high-inertia loads, calculate acceleration and braking energy instead of relying on nominal motor power alone.
Check line impedance, fuses, DC-link arrangement, cabinet ventilation and the allowed cable length. Confirm safe torque off, emergency-stop behavior and any external brake control. Safety circuits should be validated by a qualified person; a drive replacement is not an excuse to bypass an interlock.
Decide repair, replacement or migration
Repair is useful when the unit is a rare revision, when the control project is stable or when matching modules are difficult to source. A tested replacement may shorten downtime if the exact control and power combination is available. Migration can improve lifecycle support, but it needs engineering, parameter conversion and a documented acceptance test.
Send the exact labels, alarm history, project or parameter backup and required delivery date with a repair evaluation request. Vibocnc can compare a repair, tested replacement and practical sourcing route instead of quoting a generic drive with unknown compatibility.
Commission in layers
Back up drive parameters, PLC project, safety configuration and motor data. Inspect terminals, bus connectors, cooling fans and braking components. Install the approved unit, confirm grounding, then power up without motion. Check diagnostics and network identity before enabling the motor.
Run an unloaded low-speed test, then verify direction, current, feedback, braking, limits, safe torque off and communication. Move to a representative cycle only after the first tests pass. Record the final parameter set, firmware, alarm history and measured current for maintenance records.
SINAMICS selection checklist
- Classify the application and record speed, load and braking duty.
- Identify G120, S120 or the correct SINAMICS architecture.
- Match control unit, power module, motor, feedback and firmware.
- Verify PLC telegram, network identity, safety and cabinet cooling.
- Compare repair, tested replacement and migration by downtime risk.
- Back up data and document layered commissioning results.
For the controller side, read How to choose Siemens SIMATIC PLC parts. To share a label or alarm for review, contact Vibocnc.