Product Details

Baumuller 3.0308G is a revised upgraded current transformer board and signal sampling PCB designed for legacy Baumuller modular servo drive systems. This current transformer board samples real-time motor phase current, converts high-power alternating current into low-voltage analog feedback signals through integrated current transformers and precision conditioning circuits, and sends calibrated sampling data to the main control board for closed-loop torque calculation and protection judgment. Compared with the earlier 3.0308F version, this upgraded signal sampling PCB features improved noise suppression, tighter signal linearity and more stable temperature drift performance. It adopts reinforced isolation to separate high-voltage power loops from low-voltage control circuits. The multi-layer FR4 PCB is coated with conformal coating to defend against dust, moisture and corrosive vapors inside industrial cabinets. As an obsolete and hard-to-source discontinued spare, it serves as a drop-in replacement to restore accurate current sampling and reliable overcurrent protection for aging servo drives.

Basic Parameters

Brand: Baumuller

Model: 3.0308G

Product Type: Current transformer board, phase current sampling PCB card

Main Function: Motor phase current acquisition, galvanic isolation, analog signal conversion, overcurrent pre-detection, current feedback sampling

Interfaces: Power sensing terminals, backplane edge connector, status LED indicators

PCB Treatment: Conformal coated multi-layer circuit board, UL 94V-0 flame retardant

Mounting: Internal plug-in installation inside compatible Baumuller servo drive housing

Auxiliary Supply: 24 V DC for signal circuits

Net Weight: Approximately 300 g

Condition: Original discontinued industrial spare

Supported Functions

This current transformer board supports continuous high-precision phase current sampling for closed-loop torque regulation. It captures instantaneous current of each motor phase and transmits proportional sampled signals to the master control board for real-time torque calculation. The signal sampling PCB continuously detects sudden current spikes and sends pre-alarm signals to trigger rapid shutdown, protecting the IGBT power stage from burnout. It works synchronously with the main control board, gate drive board and DC-link power board to maintain stable dynamic current control. If this card malfunctions, the drive will report current feedback faults and lose normal torque regulation capability.

Core Functions

The core function of this current transformer board is isolated phase current sensing for servo drives. It converts large motor operating currents into measurable low-level analog feedback required by motion control algorithms. It provides reliable galvanic isolation between high-power circuits and logic circuits to boost equipment and operator safety. As a replacement spare, this signal sampling PCB reconstructs the current feedback and hardware protection loop of legacy motion machinery and prevents unexpected damage to the power stage.

Hardware Specifications & Environmental Features

Operating Temperature: 0°C ~ +60°C

Storage Temperature: -20°C ~ +75°C

Relative Humidity: 5%–95%, non-condensing

Housing: Bare PCB assembled with integrated current transformers

Protection: Galvanic isolation, overcurrent pre-alert, ESD protection for signal ports, IP20

Anti-interference: Shielded sensing loops and multi-stage filtering circuits to suppress electromagnetic noise inside cabinets

Compatibility: Suitable for legacy Baumuller modular servo drive units

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm 800 series backplane compatibility, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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