Technical Specifications

FAQ

1. What type of servo motor is the Siemens 1FT7068-5AF71-1CG1?
The Siemens 1FT7068-5AF71-1CG1 is a SIMOTICS S 1FT7 permanent-magnet synchronous servo motor designed for industrial motion-control applications. It uses natural cooling and is intended for operation with Siemens SINAMICS drive systems. The motor is suitable for applications requiring controlled speed, accurate positioning, high dynamic response, and stable torque performance, including machine tools, automated production equipment, positioning systems, and multi-axis machinery.

2. What are the rated speed and rated torque of the 1FT7068-5AF71-1CG1?
The motor has a rated speed of 3,000 rpm and a rated torque of 10.9 Nm. Its static torque is 13.0 Nm at a 60 K temperature rise and 15.0 Nm at a 100 K temperature rise. For dynamic applications, the motor can deliver substantially higher short-term torque, with a specified maximum torque of 63 Nm. Actual continuous and peak performance depends on the drive configuration, duty cycle, load profile, and thermal conditions.

3. What encoder is installed on the 1FT7068-5AF71-1CG1?
The motor is equipped with an AM24DQI absolute encoder featuring 24-bit single-turn and 12-bit multiturn resolution. The multiturn range covers 4,096 revolutions, and communication with the drive is handled through the DRIVE-CLiQ interface. This feedback system provides accurate rotor-position information for closed-loop motion control and is suitable for high-precision positioning, synchronized axes, and applications where reliable absolute position feedback is required.

4. Does the Siemens 1FT7068-5AF71-1CG1 have a holding brake?
No. This configuration does not include an integrated holding brake. If the machine requires the motor shaft to remain mechanically fixed after stopping or power loss, an external holding or braking mechanism may be necessary. For vertical axes or gravity-loaded mechanisms, the external brake should be properly sized for the static load and incorporated into the machine’s safety and control system.

5. What is the maximum permissible speed of the 1FT7068-5AF71-1CG1?
The maximum permissible mechanical speed is 9,000 rpm, while the maximum permissible inverter speed is 5,100 rpm. When the motor is operated with the corresponding servo drive, the applicable inverter speed limit must be observed. The actual operating speed should also be checked against the limits of the coupling, transmission, bearings, driven load, and complete mechanical system.

6. What cooling method does the 1FT7068-5AF71-1CG1 use?
The motor uses natural cooling and does not require a separate forced-air cooling system in its standard configuration. Adequate ventilation and heat dissipation should be maintained around the motor during installation. Continuous operation at high load, elevated ambient temperature, or restricted airflow can increase thermal stress. The duty cycle and load profile should therefore be evaluated when determining the permissible continuous operating condition.

7. What mounting configuration does the Siemens 1FT7068-5AF71-1CG1 use?
The motor uses IM B5 flange mounting and supports IM V1 and IM V3 mounting positions. It features a standard flange design and a plain shaft for mechanical power transmission. During installation, the flange should be securely fastened and the motor shaft should be accurately aligned with the driven equipment. Proper coupling alignment is important for reducing radial and axial loads, vibration, and bearing wear during operation.

8. What should be checked when commissioning the 1FT7068-5AF71-1CG1?
Before commissioning, verify that the SINAMICS drive contains the correct motor identification and electrical parameters. Check the power connections, protective grounding, DRIVE-CLiQ communication, encoder feedback, and Pt1000 temperature-sensor wiring. Perform an initial low-speed test to confirm the encoder feedback, rotation direction, current response, acceleration, and deceleration. If encoder communication faults, unexpected position deviations, excessive current, abnormal vibration, or high temperature occurs, stop operation and inspect the drive parameters, feedback connections, mechanical coupling, and load conditions before continuing.