SIMOTICS S-1FK2 HD — what the ratings mean for your machine
The 1FK2104-5AK01-1SB0 is a high-dynamic (HD) SIMOTICS S-1FK2 servo motor built for SINAMICS S120 drive systems, ordered under Group Code R220. Standstill torque M0 is 2.4 Nm — that is the holding torque available the instant the drive enables the winding, before the shaft begins to turn, so a sizing run that checks only the running torque at nominal speed can undersize the motor for acceleration or cogging-hold requirements. Rated power is 1.07 kW at nN=6000 rpm on the 380-480 V supply band, dropping to 0.75 kW at nN=3000 rpm on 200-240 V — the same motor, just voltage-limited in the lower band so the drive cannot extract the full speed range. If the machine runs on a 230 V regional supply, the speed ceiling and continuous power are both lower; confirm the drive's input voltage range matches before committing to a 230 V machine spec. IP65 on the barrel means the motor tolerates dust ingress and low-pressure water splash from any direction — suitable for food-processing washdown zones or packaging lines where the motor lives under periodic spray, but the connector face is the wet-end vulnerability: the DRIVE-CLiQ M17 and power connector must be mated to their respective cables before the enclosure faces any pressure wash, and the shaft seal is the part that ages under repetitive wash cycles. The single-turn 22-bit absolute encoder (AS22DQC) resolves 4,194,304 positions per revolution — that is the native resolution the drive uses for closed-loop position control, with no gear-ratio multiplication. A single-turn absolute encoder resets to zero on every revolution, so for any axis that must retain absolute position across more than one mechanical rotation, the drive must maintain a revolution counter internally; confirm the SINAMICS S120 configuration has that flag set before commissioning multi-turn position modes.
DRIVE-CLiQ integration and connector fit
The motor ships with a DRIVE-CLiQ plug size M17 and a power connector of the same M17 footprint — both are key-coded to prevent field interchange. The DRIVE-CLiQ interface carries both encoder feedback and parameterisation data back to the drive control unit over a digital bus, so there is no separate encoder cable to terminate; the wiring run is a single M17 connector pull to the drive cabinet rather than a raw encoder pigtail. Check that the SINAMICS S120 control unit you are pairing has a spare DRIVE-CLiQ port — the S120 Booksize and Blocksize units expose these, but a chassis drive may need an optional DRIVE-CLiQ option module to read the encoder. Shaft diameter is D19 mm with a 40 mm shaft length and feather key per the standard S-1FK2 dimension sheet — the feather key constrains the coupling to torque-only transmission, so any belt or pulley hub that requires a setscrew will need an adapter or a different motor variant. Confirm the driven-load coupling method before the motor arrives on site; a wrong coupling type sent to a job site costs days in rework.
Compliance and lifecycle
RoHS compliance is confirmed since 01-07-06, and REACH Article 33 duty-to-inform is documented — meaning the part carries the current REACH candidate list substances disclosure on file, which is required for machinery exported into the EU after July 2021. The export control classification is AL: N / ECCN: N_CNDU, so no dual-use restrictions apply for most global shipments, but confirm against your specific end-destination country's export regime for any large-quantity order. Product class is C — manufactured to order, non-returnable, non-reusable — which means every unit is built against a confirmed purchase order. There is no shelf-stock option and no return window if the motor is ordered to the wrong shaft dimension or voltage band. Verify the voltage band, encoder type, and connector orientation before issuing the PO; the make-to-order cycle is not reversible. For a SINAMICS S120 system, the 1FK2 family has been the standard compact servo motor for over a decade, but the specific HD variant with DRIVE-CLiQ M17 and 22-bit single-turn encoder should still be confirmed against the current Siemens configurator before a new design locks in — the encoder type and connector size are the two fields that have migrated across product revisions.