BERGER LAHR VRDM397/50LNB Servo Motor | Replacement, Equivalent & Selection Guide
The BERGER LAHR VRDM397/50LNB is a high-performance stepper servo motor from the VRDM series, engineered for precision motion control in industrial automation systems. This page provides full technical specifications, compatible replacement models, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Manufacturer: BERGER LAHR (Schneider Electric)
- Part Number / SKU: VRDM397/50LNB
- Series: VRDM (Variable Reluctance Drive Motor)
- Motor Type: Stepper Servo Motor
- Frame Size: NEMA 34 equivalent (86 mm)
- Step Angle: 1.8° (200 steps/rev full step)
- Holding Torque: ~3.97 Nm (rated)
- Rated Current: 5.0 A/phase
- Winding Configuration: LNB (Low inductance, N-type, B connector)
- Shaft: Single shaft with keyway
- Insulation Class: F (155°C)
- Protection Rating: IP54
- Weight: Approx. 890 g
- Connector Type: Industrial multi-pin (B-type)
- Compatible Drives: BERGER LAHR VRDM / WDP series drives
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as functional equivalents or drop-in replacements for the VRDM397/50LNB. Always verify electrical and mechanical parameters before substitution:
- BERGER LAHR VRDM368/50LNB — Same series, lower torque variant; suitable for lighter-load applications
- BERGER LAHR VRDM5913/50LHB — Higher torque VRDM series; for upgraded performance requirements
- Schneider Electric BCH Series — Modern servo equivalent with encoder feedback; requires drive upgrade
- Oriental Motor PK Series (PK296A2A-SG3.6) — NEMA 34 stepper with comparable torque; verify connector and drive compatibility
- Leadshine 86HS Series — Cost-effective open-loop stepper alternative; suitable for non-critical axes
Note: Konmask.com recommends using OEM BERGER LAHR parts for safety-critical or high-cycle applications. Contact us for cross-reference verification.
Why Choose the Original VRDM397/50LNB
- Proven Reliability: Designed and validated for BERGER LAHR / Schneider Electric drive ecosystems
- Plug-and-Play Compatibility: Direct replacement for existing VRDM-series installations — no re-parameterization required
- Precision Performance: Low inductance winding (LNB) enables high-speed stepping with minimal torque ripple
- Long Service Life: IP54 protection and Class F insulation ensure durability in demanding environments
- OEM Traceability: Full manufacturer documentation and serial traceability available
Typical Applications
- CNC machine tool axis drives
- Textile and packaging machinery
- Semiconductor handling and pick-and-place systems
- Printing and labeling equipment
- Conveyor and indexing systems
- Laboratory automation and medical devices
System Compatibility
The VRDM397/50LNB is designed to operate with the following BERGER LAHR drive and controller families:
- BERGER LAHR WDP Series drives (WDP3-007, WDP3-014, etc.)
- BERGER LAHR VRDM Series integrated drive-motor units
- Schneider Electric Lexium Series (with appropriate adapter cable)
- Standard step/direction pulse interfaces (5V TTL / 24V differential)
Confirm bus voltage (typically 48–72 VDC) and peak current rating of the drive before installation.
Selection Guide
Use the following criteria to determine if the VRDM397/50LNB is the right motor for your application:
- Required Holding Torque: ≤ 3.97 Nm → VRDM397/50LNB is suitable; higher torque → consider VRDM5913 series
- Operating Speed: LNB winding optimized for mid-to-high speed (≥ 1000 rpm); for low-speed/high-torque → consider HNB winding variant
- Drive Availability: Existing BERGER LAHR WDP drive → direct replacement; new installation → evaluate Schneider BCH servo system
- Environment: IP54 rated — suitable for light dust and splash; harsh wash-down → specify IP65 variant
- Budget: OEM original for critical axes; compatible alternatives for non-critical or prototype stages
Quality Assurance & Sourcing
- All units sourced from authorized distributors or verified surplus channels
- Pre-shipment inspection: visual, dimensional, and electrical continuity checks
- Original packaging and documentation preserved where available
- Warranty: 90-day functional warranty on all stocked units
- Certificates of conformity available upon request
How to Order
- Confirm part number: VRDM397/50LNB
- Specify quantity and required delivery timeline
- Add to cart or contact us directly for bulk pricing and lead time
- For cross-reference or replacement verification, email support@konmask.com with your existing motor nameplate photo
Replacement & Compatibility FAQ
Q: Can I replace VRDM397/50LNB with a standard NEMA 34 stepper motor?
A: Mechanically possible, but the LNB connector and drive interface are proprietary. A standard stepper will require a new drive and cabling. Not recommended for direct swap.
Q: Is the VRDM397/50LNB still in production?
A: BERGER LAHR was acquired by Schneider Electric. This model is discontinued but available as new-old-stock (NOS) or refurbished through specialist suppliers like Konmask.com.
Q: What is the difference between LNB and HNB winding?
A: LNB = Low inductance, optimized for higher speeds. HNB = High inductance, better for low-speed high-torque applications. Choose based on your speed-torque curve requirements.
Q: Do you provide a test report or inspection certificate?
A: Yes. Inspection reports are available upon request for all units. Contact us before ordering if documentation is required for your QA process.
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