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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.
| モデルセグメント | 説明 |
| 1FK7 | Motor series: 1FK7 compact permanent magnet synchronous servo motor, natural cooling |
| 42 | Motor size: シャフトの高さ 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 |
- コア技術パラメータ
| アイテム | 仕様 |
| Rated torque | 3.0 Nm (100K temperature class) |
| 定格電力 | 0.82 kW (1.1 HP) |
| Rated speed | 3000 回転数 |
| 定格電流 | 1.95 あ |
| 冷却方法 | Natural cooling (no external fan required) |
| 取付タイプ | B5内 (IM V1, IM V3) – flange mounting |
| 保護クラス | Standard IP65 (IP64 at shaft end); higher protection optional |
| エンコーダの種類 | アブソリュートエンコーダ (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 |
| 重さ | 約. 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.
- 柔軟な設置: IM B5 flange mounting, rotatable connectors, adaptable to various mechanical layouts.
- Reliability and durability: IP65 protection, 過酷な産業環境に適しています, long bearing life.
- Diagnostic function: Provides comprehensive motor status monitoring and diagnostics via DRIVE-CLiQ.
- 代表的な用途
- 自動化された生産ライン: Precise control of conveyors, positioning stages, assembly machinery.
- Robotics: Joint drives, end-effector positioning, especially applications requiring position retention at power loss.
- 包装機械: High-speed, precise control of paper feeding, bag making, 封印, 等.
- Printing equipment: Register accuracy control, web tension regulation.
- 工作機械: Feed and spindle drives for CNC milling machines, lathes.
- Semiconductor equipment: Wafer handling, positioning platforms requiring high cleanliness and precision.
- 医療機器: Precise motion control for diagnostic and therapeutic devices.
- Model Comparison within the Same Series
| モデル | 主な違い | 応用 |
| 1FK7042-5AF71-1EG0 | ブレーキなし | Horizontal axis, non-gravity load |
| 1FK7042-5AF71-1EG3 | ブレーキ付 (this model) | 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 | アブソリュートエンコーダ (2048 P/REV) | High-precision positioning applications |
- Drive Compatibility and Replacement Solutions
- Recommended drive: SINAMICS S120シリーズ, perfectly matched to 1FK7 series characteristics.
- 代替機種:
Siemens replacement: 1FT7042 series (mechanically compatible, 同様のパフォーマンス)
Third-party alternatives: Schneider LXM series, ABB ACS series, Mitsubishi MR-J series (observe parameter matching)
- Upgrade path: より高いパフォーマンスのために, consider 1FK7060 (5 Nm) or 1FK7080 (8 Nm).
- Installation and Maintenance Guidelines
- 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 (最大. 270°).
Correctly connect brake wiring to the brake control terminal of the drive.
- Maintenance recommendations:
Regularly check motor temperature (normal operating temperature < 85 ℃).
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:
| セグメント | コード | 説明 |
| 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 | 冷却 & 取り付け | F = standard flange; 7 = with connector; 1 = natural cooling |
| 1XX | エンコーダの種類 | 1E = absolute (ドライブ-CLiQ) |
| 1F = incremental | ||
| 1P = resolver | ||
| 1Q = absolute 20-bit single-turn | ||
| 1R = absolute 24-bit single-turn + 12-ビットマルチターン | ||
| × | Additional feature | 0 = no brake |
| 2 = with electromagnetic brake | ||
| 3 = special protection | ||
| 5 = with incremental encoder | ||
| × | Interface/accuracy | G3 = DRIVE-CLiQ, 高解像度 |
| 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) Basic Configurations
| フルモデル | コア構成 | 応用 |
| 1FK7042-2AF71-1AG0 | 3Nm, 3000回転数, 0.82kW, インクリメンタルエンコーダ, ブレーキがありません | Horizontal drive, general positioning accuracy |
| 1FK7042-2AF71-1QG0 | 3Nm, 3000回転数, 0.82kW, 20-bit single-turn absolute encoder, ブレーキがありません | High-precision positioning, position memory at power loss |
| 1FK7042-2AF71-1RB0 | 3Nm, 3000回転数, 0.82kW, 24-bit single-turn +12-bit multi-turn absolute encoder, ブレーキがありません | Multi-axis linkage, 複雑なモーション制御 |
| 1FK7042-5AF71-1EG3-2 | 3Nm, 3000回転数, 0.82kW, absolute encoder (ドライブ-CLiQ), ブレーキ付き | Vertical axis, gravity load, anti-drop at power loss |
| 1FK7042-5AF71-1FH3 | 3Nm, 3000回転数, 0.82kW, インクリメンタルエンコーダ, ブレーキ付き | High-speed reciprocating motion, high dynamic response |
| 1FK7042-2AF71-1PA0 | 3Nm, 3000回転数, 0.82kW, resolver, ブレーキがありません | Harsh EMI environment, high anti-interference requirement |
| 1FK7042-2AF71-1CB0 | 3Nm, 3000回転数, 0.82kW, absolute encoder, special protection | Dust/moist environment, IP67 |
2.2 High-Inertia / High-Dynamic Special Configurations
| フルモデル | コア構成 | 応用 |
| 1FK7042-3BK71-1QH2 | 3Nm, 3000回転数, 0.9kW, high inertia, absolute encoder, ブレーキ付き | Large inertia matching, smooth start/stop |
| 1FK7042-2AC71-1QA0 | 3Nm, 6000回転数, 1.8kW, high dynamic, absolute encoder, ブレーキがありません | High-speed positioning, 速い応答 |
| 1FK7042-2AK74-1TH0 | 3Nm, 6000回転数, 0.9kW, コンパクト, resolver, ブレーキ付き | High-speed motion, anti-interference required |
- Mainstream Brand Alternatives (3 Nm Class)
3.1 Siemens Internal Replacements
| オリジナル | 代替 | 互換性 |
| 1FK7042-5AF71-1EG3-2 | 1FT7042-5AF71-1CH1-Z N05 | Fully mechanical compatible, 同じパフォーマンス, same encoder interface |
| 1FK7042-2AF71-1QG0 | 1FK7042-5AF71-1QH0 | Optimized voltage range, otherwise identical |
| 1FK7042-2AF71-1PA0 | 1FK7042-5AF71-1PH0 | Upgraded resolver interface, 保護の向上 |
3.2 シュナイダーエレクトリック
| 代替 | 注文番号. | 主要なマッチングパラメータ |
| BCH2MF0733CA1C | 140S-M-0733 | 3Nm, 3000回転数, 0.85kW, absolute encoder, ブレーキ付き |
| LXM32AD18M2+BSH0701P01A2A | 9020-0701 | Drive+motor set, 3Nm, 3000回転数, compatible with SINAMICS environment |
3.3 ABB
| 代替 | 注文番号. | 主要なマッチングパラメータ |
| MotiFlex e180+M3AA08060HB | 3ABD00012600 | 3Nm, 3000回転数, 0.82kW, absolute encoder, ブレーキ付き |
| ACS880-01-040A-5+MQM0804-0300 | 3AXD50000038924 | Drive+motor set, fits 1FK7 mounting dimensions |
3.4 三菱
| 代替 | 注文番号. | 主要なマッチングパラメータ |
| MR-J4-350B+HF-KP43 | MR-J4-350B+HF-KP43B | 3.5Nm (compatible with 3Nm), 3000回転数, absolute encoder, ブレーキ付き |
| MR-J5-350B+HF-KP43B | MR-J5-350B+HF-KP43B | New generation, optimized communication, ~15% performance boost |
3.5 オムロン
| 代替 | 注文番号. | 主要なマッチングパラメータ |
| R88M-G30030H-S2-Z | R88M-G30030H-S2-Z | 3Nm, 3000回転数, 0.8kW, absolute encoder, ブレーキ付き |
| 1S Series + R88D-1SN03H-ECT | 1S030-30CB2-D + R88D-1SN03H-ECT | Integrated safety, SIL3認証済み, for harsh industrial environments |
- Key Guidelines for Replacement Selection
- Parameter matching priority:
Rated torque (3 Nm) > Rated speed (3000 回転数) > 力 (0.82 kW) > Rotor inertia > 保護クラス
Encoder type must match the system (absolute / incremental / resolver)
ブレーキ (サフィックス 2) is mandatory for vertical axes.
- Mechanical compatibility:
Match flange (B5内), シャフト径, 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 (ドライブ-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, スピード, encoder type and mounting dimensions, while ensuring drive compatibility and long-term supply stability.
