Description

ABB NDBU-95C 64008366D

1. Basic Information

ABB NDBU-95C (Part No. 64008366D / 3AFE64008366) is an exclusive optical fiber branching unit for ABB ACS800 series high-power inverters. As the core hardware for optical fiber network expansion of drive systems, it is mainly used for optical signal branching, link relay and signal matching, realizing multi-slave synchronous linkage of multiple inverters.

Adopting full optical fiber isolation transmission architecture, the module features low signal delay, strong anti-electromagnetic interference capability and high network stability. It effectively solves synchronous deviation and signal attenuation problems of high-power variable frequency units. Widely used in metallurgy, chemical industry, power and building materials industries, it is a standard replacement spare part for maintenance and capacity expansion of old ACS800 drive systems.

2. Technical Specifications

2.1 Basic Parameters

Model: NDBU-95C
Part Number: 64008366D / 3AFE64008366
Device Type: Inverter Optical Fiber Branching Unit
Applicable Model: ABB ACS800 full-series inverters
Communication Rate: 10Mbps high-speed fiber transmission
Core Function: Optical signal branching, link expansion, signal relay and impedance matching
Product Status: Discontinued original spare part for industrial maintenance replacement

2.2 Electrical & Communication Parameters

Power Supply: External DC24V regulated power supply
Power Consumption: Low power design with low heat generation
Transmission Medium: Industrial POF plastic optical fiber (ABB standard)
Transmission Feature: Full photoelectric isolation, no electrical coupling interference
Signal Delay: Microsecond-level ultra-low delay for high-precision synchronization
Networking Capacity: Supports multi-channel signal branching and multi-unit parallel networking

2.3 Environmental & Physical Parameters

Operating Temperature: 0℃～+60℃
Storage Temperature: -40℃～+85℃
Humidity Range: 5%～95%RH (Non-condensing)
Protection Grade: IP20
Installation Method: Standard 35mm DIN rail mounting
Weight: Approx. 0.7kg
Structural Feature: Vibration-resistant and impact-resistant industrial reinforced shell

3. Main Features

Multi-channel Optical Signal Branching: Splits single main control optical signal into multiple branch signals, realizing synchronous linkage of one master and multiple slave inverters, perfectly adapting to high-power parallel operation and power equalization processes.
Full Optical Isolation Anti-interference: Adopts pure optical signal transmission without electrical circuit coupling, completely isolating high-frequency harmonic interference of high-power inverters and avoiding signal jitter and synchronization failure.
Ultra-low Delay Synchronization: 10Mbps high-speed transmission ensures high consistency of speed, torque and phase of multiple inverters, eliminating unit unbalance and circulating current faults.
Flexible Networking Adaptability: Supports loop, chain and branch network architectures, flexibly expanding system nodes to meet complex process requirements such as redundant drive and segmented speed regulation.
Plug-and-play Compatibility: Customized for ACS800 series, no additional protocol configuration or program modification required, supporting in-situ replacement for old system maintenance and renovation.
Industrial Long-term Stability: Wide temperature resistance, dustproof and vibration-resistant design supports 7×24-hour uninterrupted operation in harsh industrial working conditions.
Link Fault Self-detection: Real-time monitoring of optical fiber link status, accurately identifying signal attenuation, disconnection and poor contact faults to assist rapid maintenance.

4. Working Principle

Power-on Initialization: After DC24V power-on, the module completes hardware self-inspection and optical path calibration, and enters standby branching mode with normal status.
Master Optical Signal Reception: Receives synchronous control commands, speed regulation parameters and operating instructions from the main ACS800 inverter or upper control unit.
Signal Splitting & Matching: The internal optical coupling circuit performs lossless signal splitting, shaping and impedance matching to ensure consistent parameters of each branch signal and eliminate attenuation and phase deviation.
Multi-branch Signal Output: Outputs calibrated synchronous signals to each slave inverter through multiple optical ports to realize one-to-many synchronous command distribution.
Multi-unit Synchronous Closed-loop Control: Multiple slave inverters execute synchronous start-stop and speed regulation actions, and feed back operating status to the main unit to form a closed-loop synchronous control network.
Real-time Link Monitoring: Continuously detects optical signal strength and link status, feeds back abnormal fault information, and ensures the stability of the entire drive network.

5. Applications

5.1 ACS800 Multi-inverter Parallel Synchronous System

Used for parallel operation of multiple high-power inverters, realizing load balancing and speed synchronization of multiple units, avoiding single-unit overload and operating imbalance of heavy-duty equipment.

5.2 Heavy-duty Master-slave Drive Control

Serves as the core synchronization hardware for metallurgical rolling mills, mine conveyors and building materials roller tables, building optical fiber master-slave network to ensure stable and impact-free operation of heavy-load equipment.

5.3 High-power Redundant Drive System

Expands network nodes for chemical and power heavy-duty variable frequency systems, builds redundant synchronous architecture, improves system fault tolerance, and guarantees continuous production operation.

5.4 Old ACS800 System Maintenance & Replacement

Replaces aging and faulty branching units with signal attenuation and synchronization failure, compatible with original wiring and programs, realizing rapid system performance recovery.

5.5 Distributed Frequency Conversion Linkage System

Expands optical fiber network coverage for distributed inverter units, realizes long-distance multi-unit synchronous control, and improves the precision and stability of distributed drive systems.