Baumüller BUM61-20 Servo Driver – Reliable 400V servo amplifier for precise, retrofit-friendly motion control

The Baumüller BUM61-20 is a proven servo drive from the BUM6x family, built for stable, precise control of AC servo motors on 400 V-class mains. From my experience, the “-20” variant typically indicates a 20 A output current class, which fits well for mid-power axes in packaging, printing, woodworking, and light machine-tool applications. One thing I appreciate is how these units integrate cleanly into existing cabinets—especially useful when you’re maintaining legacy lines and need a dependable, form-fit-function replacement without rewriting your entire control strategy.

Our Order Process and Guarantees

Key Features

• 400 V-class operation – Designed for 3-phase 380–480 VAC grids, common in European and global plants.
• 20 A output class – Suits medium-duty axes; typically ample for packaging stations, feeders, and indexers.
• Analog and digital control – Accepts ±10 V speed/torque commands plus 24 V digital I/O for enable, interlocks, and mode selection.
• Flexible feedback – Works with resolver or incremental encoder feedback (TTL/HTL), easing motor pairing and retrofit work.
• Fieldbus options – Often available with optional PROFIBUS DP or CANopen modules; RS-232/485 service port for setup.
• Booksize cabinet mounting – Compact footprint with forced-air cooling; simple panel mounting in vertical orientation.
• Built for longevity – The BUM6x platform is known for stable operation and predictable maintenance intervals in many cases.

Technical Specifications

Brand / Model	Baumüller BUM61-20
HS Code	850440 (Static converters / servo drives)
Power Requirements	3-phase 380–480 VAC, 50/60 Hz (typ.); 24 VDC control supply for logic
Rated Output Current	20 A class (continuous rating varies with configuration)
Dimensions & Weight	Booksize panel module; medium frame size; typically under 12 kg
Operating Temperature	0–45 °C (non-condensing), typical for this series
Signal I/O	±10 V analog reference; 24 VDC digital I/O (enable/fault/reset); relay status contacts
Feedback Support	Resolver and incremental encoder (TTL/HTL), model-dependent
Communication Interfaces	RS-232/485 service; optional PROFIBUS DP or CANopen via fieldbus card (where fitted)
Installation Method	Panel/cabinet mounting, vertical orientation, forced-air cooling

Application Fields

The BUM61-20 fits mid-power servo axes found in:

• Packaging machinery (form-fill-seal, cartoners, infeed belts, rotary knives)
• Printing and converting (web tension, unwind/rewind, register control)
• Woodworking and furniture lines (saws, feeders, positioning axes)
• Textile and material handling (indexing tables, pick-and-place)
• General automation retrofits where existing BUM6x footprints are preferred

“We swapped a failing axis on a case packer with a BUM61-20 and kept the existing resolver motor. The changeover was quick, and the drive ran stable without hunting.” — Maintenance Supervisor, food packaging plant

Advantages & Value

• Reliability that reduces downtime – This series is known for long service life and steady control, which in many cases means fewer nuisance stops.
• Compatibility – Works well with Baumüller servomotors (e.g., DS series) and common feedback types; fieldbus options ease controller integration.
• Cost-effective retrofit path – Form/fit familiarity typically keeps panel rework and revalidation costs low.
• Technical support – We can assist with parameter backups, startup tuning tips, and guidance on braking resistors, chokes, and EMC filters.

Installation & Maintenance

• Cabinet standards – Mount vertically in a clean, dry enclosure. Provide top/bottom clearance for airflow; avoid recirculating heated air.
• Power & wiring – Use 380–480 VAC 3-phase supply with appropriate fusing and an external braking resistor where required. A 24 VDC control supply is typically needed for logic/enable.
• EMC & grounding – Shield motor and feedback cables; ground the drive to a common PE bar. Line chokes and EMC filters are recommended in noisy mains.
• Commissioning – Parameterize motor data (resolver/encoder settings, current limits, ramps). Verify direction and tune speed/torque loops as needed.
• Routine maintenance – Keep ventilation paths dust-free, inspect fans, check terminal tightness annually, and back up parameters. Firmware updates apply where supported.
• Safety – Lock out/tag out before servicing. Older drives in this series may not include STO; interlock externally as required.

Quality & Certifications

• CE-compliant manufacturing; UL recognition on many variants (availability depends on exact submodel).
• RoHS conformity typically applicable to service stock from later production runs.
• Manufacturer’s quality system aligned with ISO practices.
• Warranty: 365 days (repair/replace as supported by test results).

Common Supporting Components

• External braking resistor sized to deceleration profile
• Line reactor / EMC filter for harmonic mitigation and noise control
• Fieldbus option cards (PROFIBUS DP, CANopen) when required by the PLC
• Resolver or incremental encoder cables with shielded, low-capacitance construction