Siemens 1FK7 Series Servo Motors – 1FK7103-5AF81-1SH3-Z

Technical Dossier

Product Details And Specifications

Siemens 1FK7 Series Technical Notes

The Siemens 1FK7 series (SIMOTICS S Synchronous Servo Motors) represents one of the most widely deployed permanent-magnet synchronous motor families in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, automotive body-in-white lines, paper mills, and offshore drilling rigs, the 1FK7 platform is the de facto standard for high-dynamic servo axis applications paired with SINAMICS S120 and SIMODRIVE 611 drive systems. Its compact frame-to-torque ratio and integrated encoder options make it the preferred choice for machine tool builders (DMG Mori, Mazak, Trumpf) and robot integrators (KUKA, ABB) operating under IEC 60034 and UL 1004 compliance frameworks.

The Evolution of 1FK7 Architecture

The 1FK7 series was introduced in the early 2000s as a successor to the 1FT6 and 1FK6 families, consolidating Siemens' servo motor portfolio under the SIMOTICS S brand umbrella. The original 1FK7 generation used resolver-based feedback (suffix -1RH) and single-turn absolute encoders (-1SH). The second-generation architecture introduced the DRIVE-CLiQ interface (suffix -1DH), enabling direct digital communication with SINAMICS S120 Control Units (CU320-2, CU310-2) without external encoder evaluation boards.

Key architectural milestones: Phase 1 (2002–2008) — resolver and incremental TTL encoders, SIMODRIVE 611 compatibility. Phase 2 (2009–2016) — DRIVE-CLiQ native integration, EnDat 2.2 multiturn absolute encoders, Safety Integrated (SIL2/PLe) via STO/SS1/SOS functions. Phase 3 (2017–present) — SIMOTICS S-1FK7 CT (Compact) and HT (High Torque) sub-families, expanded shaft seal options (IP67), and direct compatibility with SINAMICS S210 single-axis drives. Backward compatibility between Phase 1 and Phase 3 hardware requires encoder adapter modules (SMC10, SMC20, SMC30) when migrating from resolver to DRIVE-CLiQ topologies.

1FK7 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Siemens 1FK7 series, classified by frame size and encoder type:

Compact Frame (1FK7022 – 1FK7044) — Low-Inertia Axis Applications:

1FK7022-5AK71-1AA3: 0.75 Nm rated torque, resolver feedback, smooth shaft, IP64, flange B5.
1FK7032-5AK71-1RH3: 1.1 Nm, resolver, key shaft, standard inertia, SIMODRIVE 611 compatible.
1FK7040-5AK71-1DH3: 2.7 Nm, DRIVE-CLiQ single-turn absolute, IP64, B5 flange.
1FK7044-5AF71-1EH3: 4.0 Nm, EnDat 2.2 multiturn absolute, IP64, holding brake integrated.

Mid-Frame (1FK7060 – 1FK7080) — General-Purpose Servo Axes:

1FK7060-5AF71-1SH3: 6.0 Nm, single-turn absolute encoder, IP64, standard shaft with key.
1FK7063-5AF71-1DH3: 6.0 Nm, DRIVE-CLiQ multiturn, IP64, B5 flange, holding brake.
1FK7080-5AF71-1AA3: 8.0 Nm, resolver, smooth shaft, IP64, standard inertia.
1FK7083-5AF71-1EH3: 8.0 Nm, EnDat 2.2 multiturn, IP64, integrated holding brake, B5 flange.

High-Frame (1FK7100 – 1FK7105) — High-Dynamic Heavy-Axis Applications:

1FK7100-5AF71-1SH3: 10.0 Nm rated, single-turn absolute, IP64, key shaft, B5 flange.
1FK7103-5AF81-1SH3-Z: 10.0 Nm, single-turn absolute encoder (EnDat), IP65 shaft seal upgrade (-Z suffix), B5 flange, holding brake — current listing SKU.
1FK7103-5AF81-1EH3: 10.0 Nm, EnDat 2.2 multiturn absolute, IP64, holding brake, B5 flange.
1FK7103-5AF81-1DH3: 10.0 Nm, DRIVE-CLiQ single-turn, IP64, standard shaft, B5 flange.
1FK7105-5AF71-1SH3: 10.5 Nm, single-turn absolute, IP64, key shaft, high-inertia rotor variant.

Extended High-Torque (1FK7133 – 1FK7163) — Heavy Gantry and Press Axes:

1FK7133-5AF71-1SH3: 13.0 Nm, single-turn absolute, IP64, B5 flange, standard shaft.
1FK7163-5AF71-1EH3: 16.0 Nm, EnDat 2.2 multiturn, IP64, holding brake, B5 flange.
1FK7163-5AF81-1DH3: 16.0 Nm, DRIVE-CLiQ multiturn, IP65 shaft seal, B5 flange, holding brake.

Quality Control for the 1FK7 Range

The 1FK7 series presents specific test challenges due to its integrated encoder head assembly and DRIVE-CLiQ electronic nameplate (EEPROM-based motor data storage). DriveKNMS applies the following verification protocol to every 1FK7 unit processed:

Mechanical Inspection: Shaft runout measurement (≤0.02 mm TIR per IEC 60072), bearing play assessment, IP seal integrity pressure test (IP64/IP65/IP67 per IEC 60529), and brake torque verification (holding brake units).

Electrical Verification: Winding resistance balance (phase-to-phase ΔR ≤ 2%), insulation resistance test at 500 VDC (≥100 MΩ), and back-EMF waveform symmetry check at 500 RPM no-load.

Encoder & DRIVE-CLiQ Validation: Resolver units are tested on a Siemens SMC10 evaluation board for signal amplitude and phase accuracy. EnDat 2.2 units are validated via Heidenhain IK220 interface card. DRIVE-CLiQ units undergo full electronic nameplate read/write cycle on a SINAMICS S120 CU320-2 test rig to confirm motor data integrity (motor ID, pole pair count, rated current, encoder resolution).

Dynamic Run-In: Each unit completes a 30-minute loaded run-in cycle at 50% rated torque, with vibration monitoring per ISO 10816-3 and thermal imaging to confirm bearing and winding temperature profiles within specification.