Description
The DGU is a diesel engine speed controller. It is used on the ship’s main engine to control the engine RPM. The desired engine set-point speed is provided by either the ACP or by a manual control lever. Once the set point is established, the DGU maintains the engine RPM at all times. The DGU includes all essential signals related to the main governor functions. It works as an independent unit and will operate even if both CAN networks should fail. The DGU contains four CAN-buses and two RS485 serial lines. Each port is galvanically isolated. The input supply voltage of 24 VDC should not be below +18 V or above +32 V. It is galvanically isolated. Description The DGU is a diesel engine speed controller. It is used on the ship’s main engine to control the engine RPM. The desired engine set-point speed is provided by either the AC600 ACP or by a manual control lever. Once the set point is established, the DGU maintains the engine RPM at all times. The DGU includes all essential signals related to the main governor functions. It works as an independent unit and will operate even if both CAN networks should fail. The DGU contains four CAN-buses and two RS485 serial lines. Each port is galvanically isolated. The input supply voltage of 24 VDC should not be below +18 V or above +32 V. It is galvanically isolated.General system description The Bearing Wear Condition Monitoring (BWCM) System has the function of predicting bearing wear in large two-stroke diesel engines before it becomes critical. The system will provide an early warning if any of the three crank-train bearings (crosshead, crank and main bearings) experience unexpected problems during ship operation. A typical system setup is shown in Figure 1. It consists of two Bearing Wear (BW) sensors for each cylinder (fore and aft). Via the CANopen bus the sensor measurements are fed into the system communication units (DGU) where further signal filtering is performed. Presentation, trending and storing of historical data is either done via K-Chief 500 SW as a stand alone PC or integrated with the AutoChief or the K-Chief 500 AMS. Sensor PS-11 description The PS-11 sensor (see Figure 3) is based on the eddy current principle and is used for measurements against electrically conductive, ferromagnetic materials. A high-frequency alternating current flows through a coil cast in the sensor housing. The electromagnetic coil field induces eddy currents in the conductive target which alters the AC resistance of the coil. This change in impedance produces a linear electrical signal proportional to the distance of the target from the sensor. The measurements take place every time the crosshead guide shoe passes Bottom Dead Centre (BDC) during engine running. The sensor is sampling at a speed of 150 kHz. When the crank passes the BDC the sensor measures and detects the minimum distance between the sensor and the crosshead guide shoe. The minimum value is transmitted to the BWCM system. To be able to determine if one or more of the bearings have sustained any wear, the sensor needs a reference value indicating normal level of crosshead guide shoe BDC. This reference BW value is measured and stored at the time of the sensor installation and commissioning. The engine speed (RPM) will influence on the measured BW readings. Each sensors therefore measure the engine RPM and compensate the measured BW values according to RPM calibration data for each individual cylinder. The RPM compensation curves for each sensor are measured and stored during sensor commissioning on the actual engine. Also maneuvering, cargo load condition and engine frame temperature will influence on the sensor BW measurements. These effects are handled in a deviation filter for each sensor. In addition the sensor is measuring the coil temperature and does compensation in the BW value according to measured temperature. This sensor temperature compensation is set during sensor production. A typical sensor installation is shown on Figure 2. The sensors are mounted on special designed bracket and fixed to the engine frame beneath the crosshead guide shoe.
Model recommendation:
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Product Positioning and Core Functions
**Core Identity:** A core component of KONGSBERG’s industrial automation and marine control systems, specifically designed for marine propulsion systems, generator sets, and industrial machinery. It integrates digital speed control, dynamic control, and system integration functions. Suitable for marine power management, generator speed regulation, and industrial process automation scenarios.
**Technological Relevance:** Continuing KONGSBERG’s technological expertise in marine automation, it supports multi-protocol communication (such as Modbus and CAN bus) and redundant design, making it compatible with integrated marine bridge systems (such as DATACHIEF 2000) and industrial DCS/PLC systems.
**Electrical Performance:**
**Operating Voltage:** Compatible with 24V DC/120V AC power supplies, supporting wide voltage input (±15% fluctuation), suitable for harsh marine and industrial environments.
**Communication Interface:** Integrates Ethernet, RS485, and dedicated marine bus protocols (such as NMEA 2000), supporting dual redundant communication links to ensure reliable data transmission.
Dynamic Response: Step response time ≤10ms, speed control accuracy ≤±0.1%, meeting the stringent requirements of marine propulsion systems for rapid load changes.
System Architecture:
Dual Redundancy Design: Integrates dual-channel speed detection probes (A/B channels), uses an adaptive filter to remove low-frequency torsional vibration noise, and supports automatic activation and deactivation of the maximum filtered speed (e.g., 50% MCR condition) to ensure reliable speed measurement.
Modular Functionality: Includes an adjustment function block (processing speed setting, scavenging pressure, and pitch signals) and an execution function block (driving the fuel electric actuator to achieve closed-loop control of the throttle lever position), supporting a dual closed-loop system of PID speed feedback and PI throttle positioning.
Intelligent Diagnosis: Built-in fault self-display and alarm functions, supports system test, calibration modes, and multiple operating modes (idle, normal operation, test mode, etc.).
Hardware Design:
Installation Method: Supports DIN rail or panel mounting; modular design facilitates expansion and maintenance, adapting to space constraints in marine engine rooms or industrial control cabinets.
Protection Rating: IP56/IP65 protection, suitable for marine environments such as salt spray, high humidity, and vibration, with anti-corrosion conformal coating (compliant with IEC 60945 standard).
Processor: 32-bit DSP digital controller, supporting floating-point arithmetic and multi-tasking, integrated self-diagnostic functions (such as sensor verification and communication link detection).
Technical Characteristics and Parameters
Electrical Performance:
Input Signals: Compatible with speed signals (0.5-32,000 RPM), scavenging air pressure signals (4-20mA corresponding to 0~0.4MPa), and pitch signals (load compensation input).
Output Control: Outputs 4-20mA current or 0-10V DC signal to the actuator to drive the fuel rack position adjustment.
Power Supply Configuration: Supports 220V three-phase AC power (servo motor) and 220V single-phase control power, adaptable to industrial environment power supply requirements.
Dynamic Response:
Speed Control Accuracy: Error ≤ ±0.1%, response time in milliseconds, supports rapid adjustment under sudden load changes.
Filtering Mechanism: Low-pass filter removes high-frequency noise, adaptive filter handles low-frequency torsional vibration, ensuring signal stability.
Environmental Adaptability: Operating temperature range -20°C to +70°C, protection rating IP20/IP56, with sulfur-resistant conformal coating (compliant with IEC 721-3-3 1994 environmental class 3C2).
Application Scenarios and Value
Typical Applications:
Marine Main Engines: Adapted to low-speed, long-stroke diesel engines, achieving precise speed control and fuel economy optimization, supporting serial communication between the AC4 main engine remote control system and the SSU8810 security system.
Industrial Power Systems: Applied to gas turbines, generator sets, compressors, etc., meeting the needs of grid-connected power generation and load balancing.
Special Environments: Equipment health management in explosion-proof areas, high/low temperature environments, and corrosive gas environments.
Performance Advantages:
High Reliability: Dual redundancy design reduces the risk of malfunction, supports online maintenance and hot-swapping, and complies with IEC61508 SIL-2 safety certification.
Flexibility: Modular architecture supports functional expansion (such as VIT control, LCDL lubrication control), adapting to different control needs.
Maintenance: Front panel test points and status indicator lights facilitate troubleshooting, supporting remote debugging and firmware updates.
Installation and Maintenance Recommendations
Installation Specifications:
Fixed to the control panel frame in the central control room, ensuring good grounding to avoid electromagnetic interference; sensor installation positions must be precisely aligned with monitoring points (such as flywheel tooth tops), with gaps controlled within 2.5±0.5mm.
Power lines should be independently routed, avoiding sharing lines with high-voltage equipment to prevent voltage fluctuations from affecting control accuracy.
Maintenance Requirements:
Regularly calibrate sensors and check connection lines and interface status; clean module surfaces to prevent oil and dust from affecting heat dissipation and performance.
Use dedicated debugging tools for parameter configuration and log analysis, and regularly perform automatic overspeed tests and record the results.
Summary
The KONGSBERG DGU 8800E 8200177 digital speed control unit is a core control component in marine and industrial automation. It integrates high-precision speed regulation, redundant communication, intelligent diagnostics, and environmental adaptability, making it suitable for scenarios such as ship propulsion, power generation equipment speed regulation, and industrial process control. Its modular design, strong scalability, and industry adaptability make it a key solution for industrial automation and energy management.
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admin –
Product Positioning and Core Functions
Core Identity: A core component of KONGSBERG’s industrial automation and marine control systems, specifically designed for marine propulsion systems, generator sets, and industrial machinery. It integrates digital speed control, dynamic control, and system integration functions. Suitable for marine power management, generator speed regulation, and industrial process automation scenarios.
Technological Relevance: Continuing KONGSBERG’s technological expertise in marine automation, it supports multi-protocol communication (such as Modbus and CAN bus) and redundant design, making it compatible with integrated marine bridge systems (such as DATACHIEF 2000) and industrial DCS/PLC systems.
Electrical Performance:
Operating Voltage: Compatible with 24V DC/120V AC power supplies, supporting wide voltage input (±15% fluctuation), suitable for harsh marine and industrial environments.
Communication Interface: Integrates Ethernet, RS485, and dedicated marine bus protocols (such as NMEA 2000), supporting dual redundant communication links to ensure reliable data transmission.
Dynamic Response: Step response time ≤10ms, speed control accuracy ≤±0.1%, meeting the stringent requirements of marine propulsion systems for rapid load changes.
System Architecture:
Dual Redundancy Design: Integrates dual-channel speed detection probes (A/B channels), uses an adaptive filter to remove low-frequency torsional vibration noise, and supports automatic activation and deactivation of the maximum filtered speed (e.g., 50% MCR condition) to ensure reliable speed measurement.
Modular Functionality: Includes an adjustment function block (processing speed setting, scavenging pressure, and pitch signals) and an execution function block (driving the fuel electric actuator to achieve closed-loop control of the throttle lever position), supporting a dual closed-loop system of PID speed feedback and PI throttle positioning.