Servo motor sized for the 380-480 V SINAMICS S120 line
The 1FK2104-5AF10-0SB0 is a SIMOTICS S-1FK2 HD servo motor in the 1FK2 family for SINAMICS S120, listed active and shipped as a single-piece configuration from Siemens. It carries M0=2.4 Nm with PN=0.75 kW at nN=3000 rpm on the 380-480 V rail and PN=0.375 kW at nN=1500 rpm on the 200-240 V rail — the two ratings exist because the same winding is driven by a 480 V S120 line and by a 240 V S210-class inverter, and the motor's continuous torque plateau changes with the bus. For a 5-axis retrofitter this is the compact end of the 1FK2 line: a 2.4 Nm stall with a 22-bit single-turn absolute encoder (AS22DQC) and a DRIVE-CLiQ M17 plug means the drive side recognises the motor on first connect and the loop closes without a parameter file pulled off a CD — the resolution alone sets a micron-scale following-error budget on a precision axis.
Brake, shaft, and the IP64 envelope
Holding brake is fitted at the back of the stator, so a vertical axis will hold position with the drive unpowered — the brake engages the shaft at standstill, not as a dynamic stopping device, which is the behaviour the safety circuit on the SINAMICS line expects. Cylindrical shaft D19x40 mm pairs with the standard 1FK2 coupling selection; the IP64 rating seals against dust and splashing but is not a washdown rating, so the motor wants a cabinet-adjacent or covered-machine mounting, not an open coolant zone on a tool shop floor.
Connector and feedback — DRIVE-CLiQ + M17 power
Power connector size M17 and DRIVE-CLiQ plug M17: both ends use the same M17 shell size but the keying and pin map are different, so a field-swapped cable physically fits the wrong side if mis-stocked — tag them before the motor goes on the floor. The DRIVE-CLiQ link carries the encoder resolution and electronic nameplate back to the S120, which means replacing a motor is a plug-and-recommission operation rather than a manual parameter load — for a maintenance tech swapping a faulted unit, this is the difference between a five-minute axis restore and an hour at the HMI.
Lifecycle, compliance, and the order codes that travel with the motor
Product status is active on Siemens's books, and the part sits in Group Code R220 / Product Group 9021, with Product class C indicating it is built to order rather than pulled from a finished-goods buffer. RoHS compliance has been in force since 01-07-06, REACH Art. 33 disclosure is published, and export control is AL:N / ECCN:N_CNDU — no special licence for the standard machine-tool destination countries. The motor ships in a 452 x 250 x 267 mm package, single-piece quantity unit — that box volume is what the receiving dock needs to plan for, not a selection parameter.
BOM placement and how to spec it on an RFQ
Because the part is built-to-order, the procurement question is lead time against the S120 cabinet schedule, not shelf-stock — an RFQ tied to the cabinet FAT date lands the motor on the right dock window without the unit sitting in a broker's warehouse between commissioning slots.