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Siemens 1FT6108-8AC71-4EG1 SIMOTICS S Absolute Encoder Servo

Siemens SIMOTICS S 1FT6 Servo Motor with Absolute Encoder

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ManufacturerSiemens

Part number1FT6108-8AC71-4EG1

Torque 70 Nm

Speed 2000 rpm

Cooling Natural

Mounting IM B5 (IM V1, IM V3)

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70 Nm Torque 2000 rpm Speed Absolute EnDat Encoder Smooth Shaft IP65 Protection No Homing Required

Product description

The Siemens 1FT6108-8AC71-4EG1 is a SIMOTICS S synchronous servo motor featuring an absolute encoder for precise position control without homing. It offers 70 Nm of torque at 2000 rpm with natural cooling. This motor is configured for IM B5 mounting (IM V1, IM V3) with an axial power and signal connector outlet on the drive end (DE). It includes an EnDat absolute encoder (2048 S/R), a smooth shaft with circular runout tolerance N, and notably, *does not* have a holding brake. A 10% derating applies due to the absolute encoder. The vibration severity grade is N, and it is protected by a Gamma sealing ring for IP65 ingress protection.

This servo motor is ideal for dynamic applications demanding high accuracy and immediate position feedback, such as in high-speed automation, robotics, and precision manufacturing where eliminating homing sequences is beneficial. Its IP65 rating makes it suitable for environments exposed to dust and moisture.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 1FT6108-8AC71-4EG1. We provide reliable access to quality industrial automation components, helping you maintain operational continuity and efficiency.

Technical specifications

Torque	70 Nm
Speed	2000 rpm
Cooling	Natural
Mounting	IM B5 (IM V1, IM V3)
Connector Outlet	Axial DE
Encoder	Absolute EnDat 2048 S/R
Shaft	Smooth
Holding Brake	No
Vibration Severity	N
Seal	Gamma Sealing Ring (IP65)
Derating	10% (Absolute Encoder)

Common applications

High-Speed Automation

Robotics

Precision Manufacturing

Automated Logistics

Servo Systems

Applications Requiring Immediate Position Feedback

Compatible systems

Compatible with Siemens drives and control systems supporting EnDat absolute encoders and 1FT6 servo motors, provided a holding brake is not a requirement.

Also known as

Siemens Servo with EnDat SIMOTICS S Absolute Motor 1FT6108 Absolute Encoder IP65

Replaces / compatible with

This motor can replace other Siemens 1FT6 series motors that require absolute position feedback and IP65 protection, especially when a holding brake is not needed.

Technical note

Expert tip

The 10% derating due to the absolute encoder is important for thermal management, ensuring the motor operates reliably under demanding conditions without overheating.

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Frequently asked questions

Does the Siemens 1FT6108-8AC71-4EG1 servo motor require homing after power loss?

No, the Siemens 1FT6108-8AC71-4EG1 servo motor features an EnDat absolute encoder, which retains position information even when power is removed. This eliminates the need for traditional homing routines, saving time and increasing operational efficiency.