ETO ENGINEER

Removing contamination from generator and electric motor windings using Electrosolv-E Instructions for removing contamination from generator and electric motor windings using Electrosolve-E. ✅ Article ➡️ https://www.eto-engineer.com/2025/03/removing-contamination-from-generator-and-electric-motor-windings-using-electrosolve.html #drying #electricmotor #Electrosolve #generators #insulation #insulationresistance #megger #meggertest #resistance #UNITOR #varnishcoating #washing #windings

#Grounding the #steeringgear on a ship is essential for several reasons: 1. Electrical #safety – It protects the crew from electric shock in case of insulation failure. If the steering gear housing is grounded, any leakage current will flow safely to the ship’s hull, triggering protective devices. 2. Prevention of electromagnetic #interference – Powerful electrical drives in the steering gear can generate electromagnetic noise, which may affect navigation and communication equipment. Proper grounding helps minimize these disturbances. 3. #Protection against stray currents – Ships can experience stray currents that cause electrochemical corrosion of metal parts. Grounding reduces this risk. 4. Stable operation of automation systems – Modern #steering gear relies on electronic controllers, which are sensitive to unstable potential differences. Proper grounding ensures accurate sensor readings and reliable system operation. 5. Compliance with classification society requirements – Organizations such as #SOLAS, #LR, #DNV, and #ABS mandate grounding of the steering gear to ensure safe operation. In the provided image, the grounding wire is connected to the moving part of the steering gear—the #rudder stock or steering mechanism shaft. This is specifically done to dissipate stray currents that can occur due to potential differences between rotating and stationary components. This type of grounding serves multiple purposes: 1. Prevention of sparking and electrical #erosion – Rotating shafts can generate unwanted electrical currents that cause sparking and surface wear on metal parts. 2. Protection of #bearings from electrical corrosion – If stray currents pass through bearings, they can cause surface pitting and premature wear. 3. Reduction of electromagnetic interference – Uncontrolled electrical currents can generate noise that affects electronic and automation systems. To maintain a reliable electrical connection during rotation, flexible grounding straps or current collectors (brushes) are often used.

Insulation Resistance Measurement: Requirements and Procedure Introduction #InsulationResistance measurement is a critical procedure that ensures the safety and reliability of electrical systems. This process helps identify potential insulation failures, prevent short circuits, and protect equipment from overloads. This article outlines the key requirements, measurement equipment, step-by-step procedures, and evaluation criteria for insulation resistance testing. 1. General Requirements According to classification society rules (e.g., NK Rule: Pt.H, Ch.2, 18.1 Insulation Resistance Test_2015), insulation resistance measurement must be conducted for: • Feeder #circuits for power, lighting, interior communication, and other systems. • #Generators, electric motors, and heaters, with measurements taken at their working temperature. However, electronic circuits are excluded from testing to prevent damage from the insulation resistance meter. 2. Measurement Equipment Two primary instruments are used for insulation resistance testing: 1. 500V DC Insulation Resistance Meter • Used for power circuits (440V, 220V, 100V AC, 24V DC, etc.), heaters, and motor circuits. 2. Circuit #Tester • Used for measuring internal communication (I.C.) circuits and radio equipment to avoid damage from high-voltage insulation resistance testing. 3. Measurement Procedure Before performing insulation resistance measurements, follow these steps: 1. Disconnect the main #MCCB or remove the circuit fuse to ensure the circuit is de-energized. 2. Verify the measuring device’s accuracy by touching the probe to the ship’s hull; the reading should be zero. 3. Perform the measurement and record the results in the test log. 4. Evaluation Criteria The standard minimum insulation resistance is 30 MΩ or more. If the measured value is below this threshold, it is evaluated based on the following table: Table 1: Minimum Insulation Resistance Values (see photo) Note: Before testing, all electric heaters, small appliances, and similar connected loads should be disconnected from the circuit to prevent interference with the readings. 5. Interpretation of Results Results are recorded using the following classifications: • “100” – Indicates a measurement taken with a 500V DC insulation resistance meter (for power circuits, heaters, and motors). • “GOOD” – Indicates a measurement taken with a circuit tester (used for internal communication circuits, navigation equipment, and radio systems with electronic printed circuit boards). #Insulation #resistance testing is a crucial step in ensuring the reliability and #safety of marine electrical systems. Proper equipment selection, adherence to correct procedures, and compliance with standards allow early detection of potential faults and help prevent electrical failures.

Testing the Automatic Voltage Regulator (#AVR) of a #generator involves checking its output voltage, excitation system, and response to load variations. Here’s a step-by-step guide: 1. Visual Inspection • Check for burned components, loose connections, or physical damage. • Ensure all wires are properly connected to the generator’s #exciter and sensing circuits. 2. Measure Input & Output Voltages • Input #Voltage (Excitation Supply): • Disconnect the AVR from the exciter field. • Use a #multimeter to check the voltage from the AVR supply terminals (typically from the auxiliary #winding or #PMG). • Common values: 50V-200V AC (depends on generator type). • Output Voltage (Excitation to Rotor Field): • Reconnect the AVR. • Measure DC output to the exciter field when the generator is running. • Typical values: 10V-100V DC (varies based on load conditions). 3. Check Generator Output Voltage • Start the generator and check voltage across the main output terminals. • If the AVR is working, it should regulate output voltage within ±1-2% of the rated voltage. • If voltage is too high/low or unstable, the AVR may need #adjustment or #replacement. 4. #Test AVR Response • No-load test: Run the generator without load and note the output voltage. • Load test: Apply a load and check if the voltage remains stable. • If voltage drops significantly or fluctuates, the AVR might be faulty. 5. Manual Excitation Test (#Bypass AVR) • Disconnect the AVR’s excitation output. • Apply a 12V DC or 24V DC (depending on system) directly to the exciter field. • If the generator produces voltage, the exciter is fine, but the AVR may be faulty. 6. Frequency and Stability Check • Use a frequency meter to ensure stable generator frequency (50Hz/60Hz). • If frequency fluctuates, check the governor system before suspecting AVR. 7. Check AVR Adjustment Potentiometers • Some AVRs have trim pots for voltage, stability, or droop. • If voltage is unstable, minor adjustments may help, but drastic changes indicate deeper issues. Signs of a Faulty AVR: ✔ No output voltage despite excitation voltage being present. ✔ Voltage fluctuates abnormally under load. ✔ Overvoltage or undervoltage despite adjustments. ✔ Generator works with manual #excitation but not with AVR.

440V Low Insulation Alarm Test #440V #LowInsulation #AlarmTest #Insulation #alarm

Reading an electrical diagram of an electric motor starter requires understanding the symbols, components, and circuit logic. Here’s a step-by-step guide: 1. Understand the #Diagram Type • #Wiring Diagram: Shows physical connections and #wire routing. • Schematic Diagram: Uses symbols to represent components and their electrical connections. • Ladder Diagram: Used in control circuits, showing logic flow in a structured manner. 2. Identify Main Sections • Power Circuit: Supplies voltage to the #motor (includes #breakers, contactors, and overloads). • Control Circuit: Controls the operation (includes push buttons, relays, and sensors). • Protection Devices: Includes fuses, #overload relays, and emergency stops. 3. Recognize Key Components • Main Breaker (#MCCB or #MCB): Protects against overcurrent. • Contactor (K or M): A relay that switches power to the motor. • Overload Relay (#OLR): Protects the motor from overheating. • Start & Stop Push Buttons (PB1, PB2): Controls motor operation. • Auxiliary Contacts (NO/NC): Used for interlocking and feedback. 4. Trace the Power Flow • Start from the power source (L1, L2, L3 for 3-phase). • Pass through the breaker and contactor to the motor. • Check for protection devices (overload relay, #fuses). 5. Analyze the Control Circuit • The control circuit usually operates on lower voltage (e.g., 24VDC, 110V, or 220V AC). • Identify the logic: • Start button (NO) closes → Energizes coil of the #contactor → Motor starts. • Stop button (NC) opens → De-energizes coil → Motor stops. • Look for interlocks (e.g., overload relay contacts in series with the contactor coil). 6. Check for Additional Features • Interlocking: Prevents two contactors from energizing simultaneously (e.g., forward/reverse). • Timers: Delays actions in star-delta #starters. • Indicators: Lights or alarms for fault conditions.

Preventing #Blackouts: The Importance of Knowing Shipboard Power Restoration Procedures In December 2024, the U.S. Coast Guard issued Marine Safety Alert 10-24, emphasizing the critical need for crew members to be well-trained in emergency power restoration procedures. The alert was prompted by an incident in Delaware Bay, where a #vessel lost its main power supply while navigating a restricted waterway. As a result, the ship had to rely solely on its emergency generator for over an hour, causing significant operational challenges due to the crew’s lack of familiarity with power #restoration procedures. Key Issues Identified Investigations revealed that delays in restoring power were primarily caused by the crew’s insufficient understanding of the generator control system. Specifically: • A non-audible alarm on the generator control panel required manual acknowledgment before the main #generators could be restarted. • This #alarm was not integrated into the ship’s main monitoring system, making it easy to overlook. • The crew’s unfamiliarity with the control panel prevented them from quickly identifying and acknowledging the alarm, further delaying power restoration. U.S. Coast Guard Recommendations To prevent similar incidents, vessel owners, operators, and crew members are advised to: 1. Develop and implement Safety Management System (#SMS) procedures to enhance crew awareness of electrical systems and emergency power restoration protocols. 2. Conduct regular crew training on power restoration to minimize response times during blackouts. 3. Organize #blackout and reset drills under controlled conditions to ensure #emergency procedures are properly executed. This incident highlights the importance of understanding shipboard electrical systems and responding swiftly to power failures. Effective power restoration is crucial for maintaining vessel safety and operational stability. #news #USCG #safety

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#Electrical #noise in MAN ME electronic main engines refers to unwanted electrical signals that can interfere with the operation of the engine’s control system. In electronic engine control systems like those in #MAN #ME engines, electrical noise can originate from various sources and adversely affect the accuracy of control, diagnostics, and protection systems. Sources of Electrical Noise: 1. Electromagnetic Interference (#EMI): • Generators and high-voltage components. • #Sparking in relay or switch contacts. • Current surges in inductive loads, such as motors or solenoids. 2. #Grounding Issues: • Poor grounding or potential differences in different parts of the system. • Ground loops through the structure or wiring. 3. High-Frequency Components: • Variable Frequency Drives (#VFDs) or other voltage regulation devices. 4. #Cable Interference: • Improper routing of signal and power cables in close proximity. • Damaged or missing cable shielding. Impact on Engine Operation: • Incorrect readings from sensors (e.g., piston position or temperature sensors). • Malfunctions in the Engine Control System (#ECS). • Diagnostic errors or false alarms. • Communication loss between various control system modules. Methods to Minimize Electrical Noise: 1. #Shielding: • Use shielded cables for data and signal transmission. • Protect sensitive components from external electromagnetic fields. 2. Grounding: • Ensure reliable and uniform grounding of all system components. • Avoid ground loops. 3. Cable Separation: • Route signal cables separately from power cables. • Use cable trays to reduce inductive interference. 4. #Filtering: • Install filters on power inputs and signal lines. • Use #capacitors to smooth out high-frequency interference. 5. Component Maintenance: • Regularly inspect wiring insulation and connections. • Replace worn or damaged cables. Effective mitigation of electrical noise is essential for the reliable operation of MAN ME electronic control systems, especially in maritime environments where electromagnetic conditions can be complex.

Cathodic Protection of a Ship. What is MGPS, ICCP, Shaft Earthing Device? Cathodic protection of a ship is a method of preventing corrosion of the metal surfaces of a ship, especially the underwater part of the hull and submerged metal structures such as propellers and rudders. ✅ Article ➡️ https://www.eto-engineer.com/2025/03/cathodic-protection-of-ship.html #anodes #cathodes #Cathodic #CathodicProtection #CONHIRA #corrosion #electrolysis #hull #ICCP #MGPS #protection #rudder #seawater #shaft #ShaftEarthingDevice

#PreferentialTrip protection is sometimes called “Meyer protection” because its principle was first implemented and actively used on #ships built by German shipyards, in particular #Meyer Werft. Who is Meyer? • Meyer #Werft is one of the oldest shipyards in Germany, founded in 1795. • The company specializes in the construction of cruise liners, passenger ships and other seagoing vessels. • Ships built by Meyer Werft widely used a system of automatic disconnection of non-essential #consumers in case of generator overload, which led to the fact that it began to be called “Meyer #protection”. This name is rather informal and is found in professional circles, especially among #engineers and electricians working on European-built ships.

#PreferentialTrip Protection on a Ship: Load Shedding Due to Generator Overload What is Preferential Trip? A preferential trip is a protection system on a ship that automatically disconnects non-essential consumers when a #generator is overloaded. This prevents the generator from shutting down due to overcurrent protection, which could lead to a complete #blackout. How Does Preferential Trip Work? 1. Load Monitoring: • The ship’s #PMS continuously monitor the generator’s load. • If the load exceeds a preset threshold (e.g., 110% of the rated power), the system initiates a load-shedding process. 2. Disconnection of Non-Essential #Consumers: • The system disconnects non-critical loads, such as: • Air conditioning units • #Auxiliary #pumps • #Galley equipment • #Lighting in non-essential areas • This helps reduce the load and ensures the generator continues to operate normally. 3. #Load Shedding Stages: • Load shedding typically occurs in multiple stages: • Stage 1 (e.g., 105%) – Disconnects the least critical consumers. • Stage 2 (e.g., 110%) – Disconnects additional non-essential consumers. • Stage 3 (if overload persists) – Further load shedding until only essential consumers remain. 4. Load #Recovery: • Once the generator load returns to a safe level, the disconnected consumers can be reconnected manually or automatically based on priority. Integration with Automatic Start of #Standby Generator • If preferential trip does not sufficiently reduce the load, the system may automatically start a standby generator. • Once the additional generator is online, the load is redistributed, and previously disconnected consumers may be restored. Interaction with Generator Protection System • If the preferential trip does not act quickly enough and the #overload persists, the generator’s overload protection will eventually #trip to prevent damage. • This results in the generator shutting down, potentially causing a blackout if no #backup power is available. Common Issues and Troubleshooting 1. Preferential trip does not disconnect loads during overload → Check the protection settings and contactor status. 2. Generator trips on overload before preferential trip activates → Delay settings might be incorrect, or the system is not responding fast enough. 3. Aggressive load shedding → Verify the priority list and adjust the load-shedding stages accordingly. 4. Standby generator does not start automatically → Check the interface between the preferential trip system and the Automatic Mains Failure (AMF) system.

Phase fail. The turning gear and the LO autofilter of the main engine do not start ✅ Article ➡️ https://www.eto-engineer.com/2024/05/phase-fail-turning-gear-and-LO-autofilter-of-main-engine-do-not-start.html #autofilter #circuit #electricalcircuit #electricaldiagrams #LOautofilter #mainengine #phasefail #ReadingElectricalDiagrams #troubleshooting #turninggear

Installing a timer in the electrical circuit of the main engine turning gear ✅ Article ➡️ https://www.eto-engineer.com/2024/04/installing-timer-in-electrical-circuit.html #circuit #electricalcircuit #mainengine #ReadingElectricalDiagrams #relay #timerelay #timer #turninggear

How to read electrical diagrams on a ship? Main engine turning gear operation diagram A simple explanation of how to read electrical diagrams on a ship using the example of the main engine turning gear. ✅ Article ➡️ https://www.eto-engineer.com/2025/03/how-to-read-electrical-diagrams-on-ship.html #circuit #circuitbreaker #current #electricalcircuit #electricaldiagrams #mainengine #overload #ReadingElectricalDiagrams #shortcircuit #transformer #turninggear

Boiler does not switch to the second stage. Troubleshooting Greetings! Here is another article about boiler malfunctions and this time we will analyze an interesting case when the Miura boiler does not switch to the second stage in automatic mode, while there are no visible problems or alarms. ✅ Article ➡️ https://www.eto-engineer.com/2025/03/boiler-does-not-switch-to-second-stage-troubleshooting.html #Aalborg #bearings #boiler #circuit #Combustion #damper #electricalcircuit #Miura #motor #troubleshooting

Boiler safety devices. A quick check for the surveyor Greetings! In this article I recommend that you familiarize yourself with the main safety devices of auxiliary boiler on a ship that inspectors like to check. It does not matter which inspector came to the ship (PSC, flag, annual surveyor, etc.), usually the checks are not much different. ✅ Article ➡️ https://www.eto-engineer.com/2025/03/boiler-safety-devices-quick-check-for-surveyor.html #Aalborg #AlfaLaval #AMS #boiler #Kangrim #Miura #pressureswitch #PSC #Safety #safetydevices #safetyengineering #safetysystem #survey #switch #Terasaki #thermostat #Volcano

The Bermuda Triangle. The telephone exchange is going crazy, random calls on the ship In this short story, I want to tell a story that happened with the telephone exchange on the ship. One fine day, random calls began to come to the cabins of the crew members at night, when people were sleeping. ✅ Article ➡️ https://www.eto-engineer.com/2025/03/telephone-exchange-is-going-crazy-random-calls-on-the-ship.html #BermudaTriangle #blog #communication #malfunctions #NIPPONHAKUYO #phone #publicaddresssystem #telephone #troubles #troubleshooting

How Computer Power Supply Voltages Are Generated A computer power supply unit (PSU) converts AC mains voltage (typically 220V or 110V) into several DC voltages required for different components of a computer. ✅ Article ➡️ https://www.eto-engineer.com/2025/03/how-computer-power-supply-voltages-are-generated.html #ac #ATX #computers #CPU #dc #diode #MOSFET #PC #PSU #SMPS #USB #voltage #voltagecontrol

List of Popular Payment Systems for Seafarers Seafarers often use specialized #payment systems and financial services for receiving salaries, sending #money home, and covering expenses while on duty. Here is a list of popular payment systems and cards designed for seafarers: 1. Bank Cards and Accounts for Seafarers: • OceanPay – A prepaid card for seafarers, used by many shipping companies. • ShipMoney – A payment system and #MasterCard for seafarers, offering international transfers. • MarTrust – A specialized payment system for seafarers and shipping companies, providing convenient salary management, international transfers, and currency exchange. • Maritime Payment Solutions (MPS) – A company offering payroll cards and financial services for seafarers. • Payoneer – A popular system for international transfers and receiving payments in #USD, #EUR, and other currencies. • Visa Seafarer Card – A special card for seafarers provided by certain banks and shipping companies. 2. Electronic Payment Systems and Transfers: • Wise (formerly #TransferWise) – A convenient system for transfers with minimal fees. • Revolut – A multi-currency account and card, useful for travel and international transfers. • Western Union – A classic method for sending money to any country. • MoneyGram – Another popular system for fast international transfers. • Ria Money Transfer – A competitor of #WesternUnion and #MoneyGram, often used by seafarers. 3. Cryptocurrency Solutions (for Advanced Users): • Binance Pay – Allows sending and receiving payments in cryptocurrency. • Crypto.com – A card and service for international transactions in cryptocurrency. • Trustee Plus – A platform for sending and receiving crypto payments. • Tether (#USDT) and other stablecoins – Often used to bypass banking restrictions. Some #shipowners provide their own payroll #cards, operating through partner banks or payment systems. #salary #banks #PaymentSystems #seafarers