Description
The Siemens 1FK7086-4CF71-1RH0 is a permanent-magnet synchronous servo motor from the SIMOTICS S-1FK7-HD (High Dynamic) product line, engineered for high-performance multi-axis motion control, automated manufacturing, machine tools, and robotics applications.
In field installations, this motor operates with SINAMICS S120 drive systems utilizing a 510 to 720 V DC link voltage, providing rapid acceleration, precise positional control, and low rotor moment of inertia compliance with IEC standards.
Technical Specifications
| Parameter | Value |
| Manufacturer | Siemens |
| Product Series | SIMOTICS S-1FK7 (High Dynamic) |
| Model / MLFB | 1FK7086-4CF71-1RH0 |
| Rated Output Power | 2.0 kW (2.68 HP) |
| Stall Torque | 28.0 Nm (at 100 K) |
| Rated Torque | 6.50 Nm |
| Rated Speed | 3,000 rpm |
| Rated Current | 5.7 A (Stall current approx. 21.5 A) |
| DC Link Voltage | 600 V DC (compatible with 510 to 720 V DC supply) |
| Feedback System | Absolute encoder 20-bit + 12-bit multi-turn with DRIVE-CLiQ interface (AM20DQI) |
| Shaft Design | Plain shaft, tolerance N (without feather key) |
| Holding Brake | Integrated holding brake included |
| Enclosure Protection | IP64 |
| Cooling Type | Natural convection (IC 410) |
Procurement and Availability
- Condition: New Surplus / Factory Sealed / Refurbished Tested options available upon request.
- Lead Time: 1 to 3 business days for stock items; verify factory availability for specific build configurations.
- Warranty: 12-month standard warranty from date of shipment.
- Price: Indicative market pricing applies. Price subject to market conditions; contact us for a firm quote.
Integration and Compatibility Notes
The 1FK7086 requires matched power cables and DRIVE-CLiQ communication lines connected to a compatible SINAMICS S120 Control Unit and Motor Module configuration.
- Drive Compatibility: Designed specifically for operation with SINAMICS S120 inverter systems using DRIVE-CLiQ communication for automatic motor parameter identification, temperature monitoring, and high-resolution position feedback parsing.
- Holding Brake Control: Features an integrated electromagnetic holding brake powered via the brake control circuitry on the matched SINAMICS motor module. Verify dynamic braking behavior versus static holding constraints during vertical axis implementation.
- Mechanical Alignment: Features an IM B5 flange mounting layout. Ensure strict alignment tolerances and dynamic balancing of coupled loads to protect internal shaft bearings from excessive radial and axial stress under high-acceleration dynamic profiles.
Frequently Asked Questions
Q: Does the “-1RH0” suffix designate an integrated holding brake and absolute encoder? A: Yes. The suffix configuration includes an absolute multi-turn encoder with DRIVE-CLiQ interface, a plain shaft design, and an integrated holding brake. Verify exact nameplate details against the Siemens ordering data sheet.
Q: Can this servo motor operate without forced ventilation? A: Yes. The motor utilizes natural convection cooling (IC 410) across its housing surface. Ambient operating temperatures must remain within standard thresholds (0 to +40 °C) to prevent continuous thermal derating.
Q: What is the primary operational advantage of the High Dynamic (HD) series? A: The HD series features a lower rotor moment of inertia (approx. 0.0022 kg m^2) compared to standard torque series motors, enabling shorter cycle times and faster acceleration profiles in high-speed automated machinery.
