Bosch Rexroth 21/1F-D Digital Servo Drive | Replacement, Equivalent & Selection Guide
The Bosch Rexroth 21/1F-D is a compact digital servo drive (servo amplifier) from the Rexroth DIAX / Indramat drive series, designed for precise motion control in industrial automation systems. This page provides full technical specifications, compatible replacement models, equivalent alternatives, and a structured selection guide to help engineers and procurement teams make informed sourcing decisions.
Technical Specifications
| Manufacturer | Bosch Rexroth (formerly Indramat) |
| Part Number / SKU | 21/1F-D |
| Product Series | Rexroth DIAX / Indramat Digital Servo Amplifier |
| Drive Type | Digital Servo Drive / Servo Amplifier |
| Control Mode | Digital closed-loop servo control |
| Axis | Single-axis |
| Interface | SERCOS / Analog (model-dependent) |
| Feedback | Resolver / Encoder (model-dependent) |
| Cooling | Forced air / Natural convection |
| Weight | Approx. 4.8 kg |
| Condition Available | New, Refurbished, Exchange |
Note: Full electrical ratings (voltage, current, power) vary by sub-variant. Contact Konmask for datasheet confirmation.
Compatible Replacement & Equivalent Models
When the Bosch Rexroth 21/1F-D is discontinued, hard to source, or requires a cost-effective alternative, the following models are commonly evaluated as replacements or equivalents:
| Model | Brand | Type | Compatibility Notes |
|---|---|---|---|
| HDS02.2-W040N | Bosch Rexroth | Digital Servo Drive | Same Rexroth DIAX family; verify power rating |
| HDS03.2-W100N | Bosch Rexroth | Digital Servo Drive | Higher power variant; check motor pairing |
| DKS01.1-W030B | Bosch Rexroth (Indramat) | Compact Servo Drive | Indramat legacy series; firmware compatibility required |
| MKD041B-144-GP0 | Bosch Rexroth | Servo Motor + Drive | Motor-drive matched set option |
| Siemens SINAMICS S120 | Siemens | Digital Servo Drive | Cross-brand; requires re-engineering of control interface |
| Fanuc αi Series Amplifier | Fanuc | Servo Amplifier | Cross-brand; CNC-specific applications |
Important: Always verify bus interface (SERCOS, Profibus, analog), feedback type, and motor compatibility before substitution. Konmask engineers can assist with cross-reference validation.
Why Choose the Original 21/1F-D Model
- Proven reliability in Rexroth DIAX-based machine tool and press control systems
- Direct drop-in replacement for existing Rexroth / Indramat servo systems — no re-engineering required
- Digital precision: closed-loop digital control delivers superior positioning accuracy vs. analog drives
- OEM compatibility: maintains full compatibility with Rexroth IndraWorks / IndraControl engineering software
- Reduced commissioning time: plug-and-play within existing Rexroth drive topology
Typical Applications
- CNC machine tools (milling, turning, grinding centers)
- Industrial press and stamping machines
- Injection molding machines
- Packaging and converting machinery
- Robotics and multi-axis motion systems
- Textile and printing machinery
System Compatibility
| System / Controller | Compatibility |
|---|---|
| Bosch Rexroth IndraControl V / L / M | ✅ Native |
| Rexroth DIAX04 / DIAX02 Drive Systems | ✅ Native |
| Indramat TDM / KDS Legacy Systems | ⚠️ Verify firmware version |
| Siemens SINUMERIK (via adapter) | ⚠️ Interface adapter required |
| Fanuc CNC Systems | ❌ Not directly compatible |
Selection Guide
Use the following criteria to confirm the 21/1F-D is the right drive for your application, or to select the best alternative:
- Identify your motor: Match the drive to your Rexroth MKD / MHD / 2AD servo motor model and feedback type (resolver vs. encoder).
- Confirm bus interface: Determine whether your CNC or PLC uses SERCOS, analog ±10V, or Profibus — this is the primary compatibility constraint.
- Check power rating: Match continuous and peak current ratings to your motor’s requirements.
- Verify firmware: Rexroth drives use firmware-specific parameter sets; confirm firmware version compatibility with your controller.
- Assess condition requirement: New OEM stock, certified refurbished, or exchange unit — Konmask offers all three options.
- Consider lead time: For urgent replacements, Konmask maintains ready stock of common Rexroth servo drive models.
Quality Assurance & Sourcing
- All units sourced through verified industrial supply channels
- Functional testing performed prior to shipment (refurbished units)
- Original OEM packaging preserved where available
- Traceability documentation provided on request
- 12-month warranty on refurbished units; OEM warranty on new stock
- Global shipping with export compliance documentation
How to Order
- Confirm part number: Bosch Rexroth 21/1F-D
- Specify required condition: New / Refurbished / Exchange
- Provide your motor model and controller type for compatibility verification
- Contact Konmask via email or phone for a quote and lead time
- 📧 support@konmask.com | 📞 +0086 19859288691
Replacement & Compatibility FAQ
Q: Is the Bosch Rexroth 21/1F-D still in production?
A: This model is from the legacy Rexroth / Indramat DIAX series. Availability depends on OEM stock and refurbished supply. Contact Konmask to check current stock status.
Q: Can I replace the 21/1F-D with a newer Rexroth IndraDrive model?
A: Yes, but it requires re-parameterization and potentially a new motor feedback cable. Konmask can advise on the migration path.
Q: What is the difference between 21/1F-D and similar Rexroth drive variants?
A: Variants differ in continuous output current, peak current, and interface options. Always cross-reference the full part number and motor nameplate data.
Q: Do you offer exchange / repair services for the 21/1F-D?
A: Yes. Konmask offers exchange units and can coordinate repair services. Contact us with your unit’s serial number for a repair assessment.
Q: What is the lead time for the Bosch Rexroth 21/1F-D?
A: Lead time varies by stock availability. In-stock units ship within 1–3 business days. Contact us for current availability.
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Contact: support@konmask.com | +0086 19859288691
