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1FK7042-5AF71-1EG3-2 is a compact permanent magnet synchronous servo motor from Siemens SIMOTICS S series, designed for high-performance automation and motion control systems, and fully compatible with the SINAMICS S120 drive system.
| Segment de modèle | Description |
| 1FK7 | Motor series: 1FK7 compact permanent magnet synchronous servo motor, natural cooling |
| 42 | Motor size: hauteur de l'arbre 42 mm, corresponding to 3 Nm rated torque class |
| 5AF71 | Design and specification: 5AF = standard design; 71 = mounting dimensions and cooling method (natural cooling) |
| 1EG3 | Encoder and options: E = encoder type; G3 = specific encoder configuration (with DRIVE-CLiQ interface) |
| 2 | Additional feature: usually indicates electromagnetic brake to prevent shaft movement during power loss |
- Paramètres techniques de base
| Article | Spécification |
| Rated torque | 3.0 Nm (100K temperature class) |
| Puissance nominale | 0.82 kW (1.1 HP) |
| Rated speed | 3000 tr/min |
| Courant nominal | 1.95 UN |
| Méthode de refroidissement | Refroidissement naturel (no external fan required) |
| Mounting type | IM B5 (IM V1, IM V3) – flange mounting |
| Classe de protection | Standard IP65 (IP64 at shaft end); higher protection optional |
| Encoder type | Absolute encoder (identified by 1EG3), with DRIVE-CLiQ interface |
| Connector feature | Power/signal connectors rotatable through 270° for easy wiring |
| Rotor inertia | Low-inertia design for improved dynamic response |
| Poids | Environ. 4.9–5.0 kg (without brake) |
| Number of pole pairs | 4 |
- Key Features and Advantages
- High-performance permanent magnet design: Uses rare-earth permanent magnets for high power density, high efficiency and low energy consumption.
- High overload capability: Withstands short-term overload above 3x rated torque to adapt to dynamic load changes.
- Precise control: Achieves high-precision positioning and speed control with SINAMICS S120 drives.
- Brake function: Suffix “2” means electromagnetic brake, suitable for vertical axes or gravity-loaded applications to prevent dropping when powered off.
- Flexible installation: IM B5 flange mounting, rotatable connectors, adaptable to various mechanical layouts.
- Reliability and durability: Protection IP65, adapté aux environnements industriels difficiles, long bearing life.
- Diagnostic function: Provides comprehensive motor status monitoring and diagnostics via DRIVE-CLiQ.
- Applications typiques
- Lignes de production automatisées: Precise control of conveyors, positioning stages, assembly machinery.
- Robotics: Joint drives, end-effector positioning, especially applications requiring position retention at power loss.
- Machines d'emballage: Grande vitesse, precise control of paper feeding, bag making, sealing, etc..
- Printing equipment: Register accuracy control, web tension regulation.
- Machines-outils: Feed and spindle drives for CNC milling machines, tours.
- Semiconductor equipment: Wafer handling, positioning platforms requiring high cleanliness and precision.
- Matériel médical: Precise motion control for diagnostic and therapeutic devices.
- Model Comparison within the Same Series
| Modèle | Différence principale | Application |
| 1FK7042-5AF71-1EG0 | Without brake | Horizontal axis, non-gravity load |
| 1FK7042-5AF71-1EG3 | With brake (ce modèle) | Vertical axis, gravity load, position retention required at power loss |
| 1FK7042-5AF71-1EG5 | Different encoder resolution | Applications requiring higher positioning accuracy |
| 1FK7042-5AF71-1GG5 | Basic absolute encoder (32 P/REV) | Cost-sensitive applications with moderate accuracy requirements |
| 1FK7042-5AF71-1FA0 | Absolute encoder (2048 P/REV) | High-precision positioning applications |
- Drive Compatibility and Replacement Solutions
- Recommended drive: SINAMICS S120 series, perfectly matched to 1FK7 series characteristics.
- Alternative models:
Siemens replacement: 1FT7042 series (mechanically compatible, performances similaires)
Third-party alternatives: Schneider LXM series, ABB ACS series, Mitsubishi MR-J series (observe parameter matching)
- Upgrade path: For higher performance, consider 1FK7060 (5 Nm) or 1FK7080 (8 Nm).
- Directives d'installation et d'entretien
- Pre-installation checks:
Confirm compatibility between motor and drive system.
Inspect motor appearance and shaft condition.
Verify encoder type and interface.
- Installation precautions:
Ensure flatness during flange mounting to avoid eccentric load.
Rotate connectors to optimal wiring position (maximum. 270°).
Correctly connect brake wiring to the brake control terminal of the drive.
- Maintenance recommendations:
Regularly check motor temperature (normal operating temperature < 85 °C).
Keep motor clean to avoid dust buildup affecting heat dissipation.
Periodically verify brake operation for reliable holding when de-energized.
Protect encoder cables from strong electromagnetic interference.
1FK7042-5AF71-1EG3-2 is a 3 Nm compact permanent magnet synchronous servo motor from Siemens SIMOTICS S series, equipped with absolute encoder and brake, naturally cooled. It is ideal for industrial automation applications requiring high-precision positioning and position retention at power loss.
With low inertia and high overload capability, it performs excellently in high dynamic response applications, and achieves outstanding motion control performance with the SINAMICS S120 drive system.
Siemens 1FK7042 Series Servo Motor: Complete Coding System and Cross-Brand Alternatives
- Full Model Naming Convention
Each segment of 1FK7042-XXXXX-XXXX-X has a clear meaning that defines core properties and configuration:
| Segment | Code | Description |
| 1FK7 | Fixed prefix | Siemens SIMOTICS S compact PMSM, natural cooling |
| 42 | Size code | Shaft height 42 mm, 3 Nm rated torque; 04 = shaft height, 2 = length class |
| XX | Design type | 2A = standard compact |
| 3B = high inertia | ||
| 5A = compact (510V–720V) | ||
| 2C = high dynamic | ||
| F71 | Refroidissement & montage | F = standard flange; 7 = with connector; 1 = natural cooling |
| 1XX | Encoder type | 1E = absolute (DRIVE-CLiQ) |
| 1F = incremental | ||
| 1P = resolver | ||
| 1Q = absolute 20-bit single-turn | ||
| 1R = absolute 24-bit single-turn + 12-bit multi-turn | ||
| X | Additional feature | 0 = no brake |
| 2 = with electromagnetic brake | ||
| 3 = special protection | ||
| 5 = with incremental encoder | ||
| X | Interface/accuracy | G3 = DRIVE-CLiQ, haute résolution |
| A0 = standard accuracy | ||
| H2 = with mechanical brake | ||
| U0 = incremental encoder (±1 pulse accuracy) |
- Complete 1FK7042 Model List (by Configuration)
2.1 Standard Compact (2A/5A) Configurations de base
| Modèle complet | Configuration de base | Application |
| 1FK7042-2AF71-1AG0 | 3Nm, 3000tr/min, 0.82kW, incremental encoder, no brake | Horizontal drive, general positioning accuracy |
| 1FK7042-2AF71-1QG0 | 3Nm, 3000tr/min, 0.82kW, 20-bit single-turn absolute encoder, no brake | Positionnement de haute précision, position memory at power loss |
| 1FK7042-2AF71-1RB0 | 3Nm, 3000tr/min, 0.82kW, 24-bit single-turn +12-bit multi-turn absolute encoder, no brake | Multi-axis linkage, contrôle de mouvement complexe |
| 1FK7042-5AF71-1EG3-2 | 3Nm, 3000tr/min, 0.82kW, absolute encoder (DRIVE-CLiQ), avec frein | Vertical axis, gravity load, anti-drop at power loss |
| 1FK7042-5AF71-1FH3 | 3Nm, 3000tr/min, 0.82kW, incremental encoder, avec frein | High-speed reciprocating motion, high dynamic response |
| 1FK7042-2AF71-1PA0 | 3Nm, 3000tr/min, 0.82kW, resolver, no brake | Harsh EMI environment, high anti-interference requirement |
| 1FK7042-2AF71-1CB0 | 3Nm, 3000tr/min, 0.82kW, absolute encoder, special protection | Dust/moist environment, IP67 |
2.2 High-Inertia / High-Dynamic Special Configurations
| Modèle complet | Configuration de base | Application |
| 1FK7042-3BK71-1QH2 | 3Nm, 3000tr/min, 0.9kW, high inertia, absolute encoder, avec frein | Large inertia matching, smooth start/stop |
| 1FK7042-2AC71-1QA0 | 3Nm, 6000tr/min, 1.8kW, high dynamic, absolute encoder, no brake | High-speed positioning, réponse rapide |
| 1FK7042-2AK74-1TH0 | 3Nm, 6000tr/min, 0.9kW, compact, resolver, avec frein | High-speed motion, anti-interference required |
- Mainstream Brand Alternatives (3 Nm Class)
3.1 Siemens Internal Replacements
| Original | Alternative | Compatibilité |
| 1FK7042-5AF71-1EG3-2 | 1FT7042-5AF71-1CH1-Z N05 | Fully mechanical compatible, same performance, same encoder interface |
| 1FK7042-2AF71-1QG0 | 1FK7042-5AF71-1QH0 | Optimized voltage range, otherwise identical |
| 1FK7042-2AF71-1PA0 | 1FK7042-5AF71-1PH0 | Upgraded resolver interface, improved protection |
3.2 Schneider Électrique
| Alternative | Numéro de commande. | Paramètres de correspondance clés |
| BCH2MF0733CA1C | 140S-M-0733 | 3Nm, 3000tr/min, 0.85kW, absolute encoder, avec frein |
| LXM32AD18M2+BSH0701P01A2A | 9020-0701 | Drive+motor set, 3Nm, 3000tr/min, compatible with SINAMICS environment |
3.3 ABB
| Alternative | Numéro de commande. | Paramètres de correspondance clés |
| MotiFlex e180+M3AA08060HB | 3ABD00012600 | 3Nm, 3000tr/min, 0.82kW, absolute encoder, avec frein |
| ACS880-01-040A-5+MQM0804-0300 | 3AXD50000038924 | Drive+motor set, fits 1FK7 mounting dimensions |
3.4 Mitsubishi
| Alternative | Numéro de commande. | Paramètres de correspondance clés |
| MR-J4-350B+HF-KP43 | MR-J4-350B+HF-KP43B | 3.5Nm (compatible with 3Nm), 3000tr/min, absolute encoder, avec frein |
| MR-J5-350B+HF-KP43B | MR-J5-350B+HF-KP43B | New generation, optimized communication, ~15% performance boost |
3.5 OMRON
| Alternative | Numéro de commande. | Paramètres de correspondance clés |
| R88M-G30030H-S2-Z | R88M-G30030H-S2-Z | 3Nm, 3000tr/min, 0.8kW, absolute encoder, avec frein |
| 1Série S + R88D-1SN03H-ECT | 1S030-30CB2-D + R88D-1SN03H-ECT | Integrated safety, SIL3 certified, for harsh industrial environments |
- Key Guidelines for Replacement Selection
- Parameter matching priority:
Rated torque (3 Nm) > Rated speed (3000 tr/min) > Pouvoir (0.82 kW) > Rotor inertia > Classe de protection
Encoder type must match the system (absolu / incremental / resolver)
Brake (suffixe 2) is mandatory for vertical axes.
- Compatibilité mécanique:
Match flange (IM B5), diamètre de l'arbre, keyway to original equipment.
Connectors rotatable 270° for wiring convenience.
Brake wiring must match drive brake control terminals.
- Drive compatibility:
Siemens SINAMICS S120 works natively with 1FK7/1FT7.
Third-party drives must support the encoder interface (DRIVE-CLiQ / SSI / incremental).
Same-brand drive-motor combinations are recommended to minimize issues.
The 1FK7042 series is the core 3 Nm torque class product in the Siemens SIMOTICS S family.
With various encoder, brake and protection configurations, it covers standard industrial to harsh environment applications.
When selecting replacements, prioritize matching torque, vitesse, encoder type and mounting dimensions, while ensuring drive compatibility and long-term supply stability.
