Description
1. Product Overview
RELIANCE DASR-6 (Part No.: MD-B7005B) is an original high-end servo drive main control axis card manufactured by RELIANCE ELECTRIC, USA. It is a dedicated core control board designed for high-power VZ7000 series servo drives, serving as the core unit for computation, signal acquisition, logic scheduling and motion control in high-precision industrial servo transmission systems. As a high-spec dedicated axis control module for the VZ7000 drive system, it integrates high-precision position closed-loop calculation, speed regulation, current vector control, encoder signal decoding, fault diagnosis protection and bus communication functions. It undertakes core control tasks of the servo drive under all operating conditions and acts as the central hub of the entire servo transmission system.
Manufactured in strict accordance with RELIANCE’s original industrial-grade design standards, the DASR-6 MD-B7005B is fully compatible with all VZ7000 series servo drives and supports direct in-situ replacement and upgrading of legacy equipment. Equipped with a dedicated motion control chip and highly stable signal processing circuits, the board features excellent anti-interference, anti-vibration and wide-temperature performance. It is suitable for high-power, high-load, high-precision continuous industrial transmission applications including metallurgical rolling mills, heavy-duty machine tools, paper production lines, rubber & plastic extruders and hoisting transmission systems. As a critical wearable main control component of the VZ7000 servo system, it is widely adopted in renovation of aged RELIANCE servo equipment, technical modification of production line transmission systems, spare parts replacement and equipment performance upgrading, and serves as an essential standby spare part for heavy-duty industrial servo transmission systems.
2. Technical Features
2.1 Dedicated Motion Control Architecture for High-Precision Servo Closed-Loop Regulation
Fitted with a proprietary RELIANCE servo motion control processor and adopting advanced vector control algorithms, it supports precise three-loop regulation (position loop, speed loop and current loop). It enables high-precision positioning, stable speed regulation and constant torque output of servo motors under heavy-load conditions. The control logic is optimized for heavy industrial characteristics such as load fluctuation, start-stop impact and continuous variable operating conditions, effectively suppressing speed oscillation, position deviation and torque fluctuation. It delivers micron-level positioning accuracy and millisecond dynamic response of the servo transmission system, meeting stringent control requirements for heavy-duty high-precision industrial transmission.
2.2 Integrated Multi-Dimensional Signal Processing for Full-Condition Signal Acquisition
The board integrates dedicated encoder signal decoding circuits, analog sampling circuits and digital logic processing circuits to accurately collect position and speed signals from servo motor encoders, as well as current, voltage and operating status signals of drive units. It supports high-speed decoding and filtering of differential signals, pulse signals and analog signals, effectively eliminating field noise interference and guaranteeing real-time and accurate signal acquisition. It provides reliable data support for servo closed-loop control, condition monitoring and fault judgment.
2.3 Built-In Multiple Protection Mechanisms to Maximize Operational Safety
Native comprehensive fault monitoring and protection functions are embedded within the servo system. It continuously monitors faults including overcurrent, overvoltage, undervoltage, overload, overheating, encoder failure, communication breakdown, circuit abnormality and parameter error. Functions such as automatic fault latching, instantaneous shutdown protection, fault code storage and operating condition traceability are available. It can rapidly cut off drive output to avoid risks including motor burnout, power module breakdown and mechanical structure damage, safeguard the safe operation of servo drives and associated machinery, and reduce equipment failure losses under heavy loads.
2.4 Original Perfect Matching with Strong Compatibility and Versatility
As the exclusive original main control axis card for VZ7000 servo drives, its hardware pinout, circuit logic and program parameters fully match all VZ7000 series servo drives. No wiring modification or underlying parameter commissioning is required, allowing direct in-situ installation and replacement. It seamlessly works with power units, heat dissipation modules, communication modules and operator panels of the same series, compatible with both old and new VZ7000 system architectures. It facilitates quick replacement of faulty legacy boards, equipment function restoration and system optimization, greatly lowering maintenance and technical transformation costs.
2.5 Industrial-Grade Hardware Construction Suited for Harsh Heavy-Duty Conditions
The board adopts military-spec multi-layer PCB with thickened copper traces and anti-oxidation gold-plated contacts. Key chips are wide-temperature industrial components that have passed rigorous temperature cycling, vibration shock and EMC tests. The printed circuit features multi-layer shielding and anti-interference routing, delivering outstanding resistance to electromagnetic interference, vibration, temperature variation, moisture and dust. It can operate stably for long periods in industrial sites with heavy dust, intense vibration and complex electromagnetic environments such as metallurgy, heavy industry and rubber & plastic processing, featuring low failure rate and extended service life.
2.6 Onboard Parameter Storage & Self-Diagnosis for Convenient Maintenance
A non-volatile memory unit is integrated to permanently store operating parameters, servo control recipes, fault logs and commissioning parameters without data loss after power-off. Embedded original self-diagnosis routines automatically complete hardware self-test, circuit verification and signal link detection upon power-up. It accurately locates fault points and outputs standard fault codes, enabling maintenance staff to quickly troubleshoot, commission equipment and optimize operating parameters, significantly improving inspection and daily maintenance efficiency.
3. Technical Specifications
3.1 Basic Specifications
Model: DASR-6 Part Number: MD-B7005B Brand: RELIANCE ELECTRIC Device Type: Servo Drive Main Control Axis Card / Control Mainboard Compatible Equipment: All RELIANCE VZ7000 Series Servo Drives Core Functions: Three-loop servo computation, signal acquisition & decoding, motion logic control, fault protection diagnosis, system parameter storage, equipment condition scheduling Hardware Version: Original New Standard Version Applicable Scenarios: Heavy-duty industrial servo transmission control, maintenance replacement of legacy equipment, system technical upgrading Core Advantages: High-precision closed-loop control, comprehensive fault protection, strong anti-interference performance, plug-and-play in-situ replacement, wide operating condition adaptability
3.2 Control Performance Specifications
Control Algorithm: Vector three-loop control (Position Loop, Speed Loop, Current Loop) Control Accuracy: High-precision positioning and steady speed control for heavy-duty precision transmission Response Speed: Millisecond-level dynamic response, rapid adaptation to load fluctuations and condition switching Speed Regulation Characteristics: Wide-range stepless speed regulation; stable low-speed operation without oscillation and consistent high-speed performance without deviation Torque Control: Constant torque output control, suitable for heavy-load start-stop and variable-load operation Logic Functions: Point positioning control, continuous operation, interlock control, fault protection shutdown, adaptive parameter adjustment
3.3 Signal & Interface Specifications
Encoder Interface: Dedicated differential encoder signal input interface supporting high-speed pulse decoding Analog Channels: Multiple analog input and output channels for voltage, current and speed signal exchange Digital Channels: Multiple digital input and output channels for equipment start/stop, interlock and status feedback Communication Bus: Dedicated internal bus for VZ7000 system enabling data synchronization between power unit and main controller Signal Characteristics: Onboard hardware filtering, anti-interference and signal error correction to prevent field signal distortion and false triggering
3.4 Fault Protection Specifications
Protection Types: Overcurrent, Overvoltage, Undervoltage, Overload, Overheat, Encoder Fault, Communication Abnormality, Circuit Short Circuit, Parameter Error Fault Mechanism: Real-time monitoring, instantaneous response, automatic equipment latching, fault code storage, self-test and reset upon power-up Fault Tolerance: Adaptive tolerance for minor abnormal conditions; immediate shutdown protection once thresholds are exceeded to prevent equipment damage Log Storage: Automatic recording of fault sequence, fault type and operating conditions to support traceability analysis
3.5 Electrical Specifications
Operating Power Supply: Matches standard internal power supply of VZ7000 drives Operating Voltage: Industrial low-voltage DC power supply conforming to native drive power architecture Power Consumption: Low power operation with low temperature rise and high stability Electrical Features: Built-in surge, ESD and reverse current protection, adaptable to industrial grid fluctuation Operating Stability: Continuous 7×24-hour non-stop operation without drift or logic disorder
3.6 Mechanical & Construction Specifications
PCB Material: Industrial multi-layer PCB with thickened copper traces and anti-oxidation gold-plated contacts Routing Design: Shielded anti-interference wiring with partitioned circuit layout to avoid signal crosstalk Mounting Method: Standard slot mounting compatible with VZ7000 drive rack Structural Features: Compact board layout matching the drive housing, firm installation with vibration resistance Surface Protection: Moisture-proof and anti-corrosion coating for complex industrial environments No moving mechanical components, vibration-resistant and aging-resistant
3.7 Environmental Specifications
Operating Temperature: 0℃ ~ +70℃ Storage Temperature: -25℃ ~ +85℃ Operating Humidity: 5% ~ 95%RH (Non-condensing, free of strong corrosive gas) EMC Grade: Industrial electromagnetic compatibility, resistant to severe on-site electromagnetic interference Environmental Resistance: Vibration resistance, humidity resistance, dust & corrosion resistance, thermal shock resistance Operation Mode: Supports unattended 7×24-hour continuous stable operation all year round
4. Operating Principle
As the core control hub of the VZ7000 servo drive, the RELIANCE DASR-6 MD-B7005B coordinates signal acquisition, logic computation, condition regulation and fault protection of the whole servo system via its dedicated motion control chip and three-loop vector control architecture. After power-on, the board automatically performs full hardware self-test, circuit verification, interface initialization, system parameter loading and bus communication matching to complete initialization and standby, ensuring trouble-free startup and valid parameters.
During normal operation, the board collects position and speed pulse signals from servo motor encoders via dedicated interfaces. It simultaneously acquires bus voltage, operating current, module temperature and equipment status data of the drive. Based on embedded high-precision vector control algorithms, it executes real-time position closed-loop correction, steady speed regulation and current torque optimization. In response to upper control commands and field load conditions, it outputs precise control signals to drive power units to adjust output power, realizing smooth start-stop, accurate positioning, constant-speed operation and constant torque output of servo motors to satisfy continuous, variable-load and high-precision transmission requirements of heavy machinery.
Throughout operation, the board continuously monitors circuit status and signal parameters. Once overcurrent, overvoltage, overload, encoder failure, communication interruption or other faults are detected, closed-loop protection is triggered instantly. Drive output is cut off, fault status is latched, fault codes and operating parameters are stored to prevent fault escalation. Fault information is uploaded to the drive operator panel for visual alarm and accurate tracing, ensuring safe, stable and precise operation of the servo transmission system.
5. Application Scenarios
5.1 Core Control for Heavy-Duty Industrial Servo Transmission Systems
Exclusively matched with RELIANCE VZ7000 high-power servo drives. Widely deployed in metallurgical rolling equipment, heavy-duty CNC machine tools, paper production lines, rubber & plastic extruders, textile setting machines, large hoisting transmission devices and other heavy-duty industrial applications. It undertakes core tasks including precise motion control, load adaptive regulation and safety interlock protection for servo systems, guaranteeing high-precision and stable continuous operation of heavy machinery.
5.2 Maintenance Replacement for Aged RELIANCE Servo Equipment
For long-serving VZ7000 servo drives, it can directly replace aged, faulty or damaged original main control axis cards. No modification of wiring or control programs is required. It rapidly restores equipment functionality, transmission accuracy and operational stability, resolving common failures such as control disorder, positioning drift, frequent alarms and startup failure, and extending service life of legacy assets significantly.
5.3 Technical Upgrade of Production Line Transmission Systems
Applicable to upgrading automation production line servo systems. Installation of brand-new original DASR-6 main control boards improves servo algorithm precision, enhances anti-interference capability and optimizes fault protection mechanisms. It addresses issues including insufficient computing capacity, degraded control accuracy and high failure rates of old boards, improving transmission stability and production precision across the whole production line.
5.4 Adaptation for High-Precision Continuous Production Processes
Suited for automated production lines requiring uninterrupted 7×24-hour operation. Leveraging stable computing capability, comprehensive fault tolerance and low control drift, it avoids production line shutdown, process deviation and higher defect rates caused by main control board failures, supporting stable continuous high-precision manufacturing.
5.5 Critical Standby Spare Part for Industrial Equipment Maintenance
As a key wearable main control component of the RELIANCE VZ7000 servo system, it features strong versatility, accurate model matching and convenient replacement. It serves as an essential maintenance spare part for enterprises in heavy industry, light industry, metallurgy, rubber & plastics and other sectors. It enables rapid response to sudden on-site failures, minimizes downtime and reduces production loss.
