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Siemens 6SN1121-0BA11-0AA1

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2 Year warranty

Part Number6SN1121-0BA11-0AA1
TypeAC Drives
Model #6SN11210BA110AA1
Warranty2 Year
OperationControl Module
DestinationMain Spindle Drive
Phase1 Phase
ControlClosed Loop
Simodrive611 Plug In

Our Repair Services

MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.

Repair Benefits

MRO can restore your failed 6SN1121-0BA11-0AA1 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this 6SN1121-0BA11-0AA1 we also repair a wide range of other Siemens products, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty 6SN1121-0BA11-0AA1, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

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Ask about exchanging your faulty 6SN1121-0BA11-0AA1 for credit when ordering from MRO Electric

MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Siemens 6SN1121-0BA11-0AA1 Overview

The 6SN11210BA110AA1 power module is manufactured by Siemens for the SIMODRIVE 611 line of drive converters. The power module is constructed for use with the control module. These two come together to form the drive module. The drive module is necessary for feed applications as well as main spindle applications.


There are certain motors with which the Siemens power module 6SN11210BA110AA1 is able to operate. It can be connected to the following servo motors: 1FT6, 1FK6, and 1FK7 servo motors. It can be connected with direct drives’ 1FW6 built–in torque motors. The 6SN11210BA110AA1 works with 1FN linear motors and 1PH main spindle motors.  The Siemens power module 6SN11210BA110AA1 is able to operate standard induction motors. It can do this if IM operation is selected and only inverter pulse frequencies of 4 kHz and 8 kHz are acceptable. The 6SN11210BA110AA1 is also manufactured to work with the 1 PM hollow shaft motors that run main spindle drives as a direct drive. It operates 1FE1 main spindle motors and the 2SP1 motor spindle. After checking with the motor manufacturer to be sure that the motor meets sine modulation requirements as well as insulation requirements and dV/dt resistance requirements, the Siemens power module 6SN11210BA110AA1 can be connected to a third-party motor.

A series reactor like a 3–arm iron core reactor might be necessary for the event that you are using the Siemens power module 6SN11210BA110AA1 to operate a special motor. Another option when using the power module 6SN11210BA110AA1 to operate a special motor is to increase the inverter pulse frequencies of the converter. Both of these measures may be necessary depending on the particular motor being operated by the 6SN11210BA110AA1.


The Siemens power module 6SN11210BA110AA1 is used in different operating modes depending on the motor that it is operating. The operating mode synchronous motors are FD for feed drives. The motors operated in this mode are the 1 FT 6, 1 FK 6, and 1 FK 7 servo motors, the 1 FW 6 built–in torque motors (direct drives), and the 1 FN linear motors.

For main spindle drives with induction motors, the Siemens 6SN11210BA110AA1 works in MSD–IM operating mode. This operating mode is for operating 1 PH main spindle motors and 1 PM hollow shaft motors for main spindle drives (direct drives). The 6SN11210BA110AA1 also uses MSD–IM operating mode for standard induction motors (sensorless), but only if IM operation is selected and only for inverter pulse frequencies of 4 kHz and 8 kHz. 

For main spindle drives with synchronous motors, the Siemens 6SN11210BA110AA1 works in MSD–IM operating mode. This mode is used specifically for 1 FE 1 main spindle motors and the 2 SP 1 motor spindle.

In order to maintain the optimum frequency ratio between the inverter pulse frequency and the output frequency the Siemens 6SN11210BA110AA1, used in MSD-SRM operating mode that is used for high-speed MSD synchronous applications, the inverter pulse frequencies will differ from the rated frequencies.

Siemens products are manufactured in Germany and are designed for Automotive, aerospace, power generation, and electronics usage. They come with a 2-year warranty from MRO Electric. We also carry AC Drives from other manufacturers such as FANUC and Yaskawa.

Contact Us Today For More Information About Siemens Products

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 6SN1121-0BA11-0AA1, take a look at more from our AC Drives line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 6SN1121-0BA11-0AA1 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.

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Very happy with the overall service, delivery, communication and delivery,

Conley Cooke

I needed a special drive, found it, and I was quickly assisted by Joe Kaminski. Everything was exactly as it should be....


We have an older DMU80 CNC Machine and the Handheld Control was damaged beyond repair. MRO was very helpful in confirmin...

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