ETO ENGINEER

#Stickers or #labels placed next to fire detectors on a vessel are not decorative — they are an important part of the #safety and #maintenance system. Here’s why they are needed: 1. #Detector identification (address/number) Every fire detector has a unique address, which appears: • on the fire alarm control panel (#FACP) • in fire zone drawings • in the loop list / address list The sticker helps crew and inspectors quickly identify: • the zone, • the detector number in the loop, • the type (smoke / heat / multi-sensor). 2. Troubleshooting and maintenance When the panel shows something like: FAULT: Detector 2/034 – Cabin 312 or FIRE: LOOP 1, DETECTOR 018 the engineer can go to the actual location and verify the correct detector using the sticker. Without labeling, finding one specific detector among many identical ones is almost impossible. 3. Class requirements (#DNV, #LR, #ABS) Classification societies require that all #fire detectors be properly marked so: • the correct detector can be found quickly in case of alarm or fault, • inspectors can compare real installation with #drawings, • confusion during repairs is avoided. 4. Testing convenience During annual fire alarm testing (#FAR / FACP test): • the technician walks through the vessel with a #loop list or tablet, • activates each detector, • checks if the address shown on the panel matches the label. 5. #Shipyard and contractor work During upgrades or new installations: • labels help identify which loop the detector belongs to, • which #SCI is associated with it, • and the order of addresses in the loop.

- Do you see the problem? - No. - There is one! #cable #MainEngine #ME

This happens too 😅 #troubleshooting #electrician #ETO

Articles about Automatic Voltage Regulator on the eto-engineer.com 1. Automatic Voltage Regulators. What is a generator AVR or Automatic Voltage Regulator? 2. Automatic Voltage Regulator and Parallel Operation of generators. Voltage droop 3. Automatic Voltage Regulator. Real power, Reactive power, Apparent power. KW, KVAR, KVA 4. Function of Voltage Regulator and Parallel Generator Operation 5. The Current Transformer Unit - Parallel Switch. Paralleling Different Size Generators 6. Checking and Troubleshooting a Reactive Compensation Circuit for the AVR in an Isolated AC Bus 7. ACB Trouble. The generator does not connect to the main busbars. Troubleshooting ✅ All articles in one place ➡️ https://www.eto-engineer.com/p/automatic-voltage-regulator.html #automaticvoltageregulator #AVR #circulatingcurrent #CurrentTransformer #droop #generator #generators #paralleloperation #powerfactor #troubleshooting #voltage #voltagedroop #voltageregulator

MSB Cleaning #MSB #Cleaning #DD #DryDock

Normally stored by Wärtsilä — copying or modifying requires service software. Common Problems Engineers Face 1. Speed signal error Cause: Dirty or faulty speed encoder. Result: The engine may trip due to incorrect RPM feedback. 2. CAN bus fault Cause: Loose cable connections or improper shield grounding. Result: Cylinder control units stop responding or communication becomes unstable. 3. Injection solenoid failure Cause: Burned coil or stuck solenoid valve. Result: One cylinder produces low power or misfires. 4. Sensor drift Cause: Aging sensors, heat, or vibration. Result: Incorrect readings lead to wrong load control or emergency mode activation.

Below is a clear and practical explanation of the #Wärtsilä #WECS 9520 control system used on many Wärtsilä main engines (usually medium-speed engines like W-32 / W-38 series). I’ll keep it understandable but still technical so it’s useful for ETOs and engineers onboard. What is WECS 9520? WECS = Wärtsilä Engine Control System 9520 = model/version of the electronic automation and control platform. It is the electronic control system that manages all main functions of the engine: • Fuel injection • Start/stop sequences • Speed and load control • Safety protections • Alarms & shutdowns • Monitoring of critical sensors • Cylinder balancing and performance control WECS 9520 is similar in philosophy to #MAN’s EDC / Volvo’s EMS but designed for Wärtsilä engines. Main Components of WECS 9520 1. #ECU (Engine Control Unit) The “brain” of the system. Located on the engine, often one ECU per engine (sometimes redundant). Functions: • Processes sensor data (speed, temperature, pressure) • Calculates injection timing & quantity • Controls actuators (fuel injection valves, start-up valves) • Manages safety logic—overspeed, low oil pressure, etc. Runs on a real-time processor and has dedicated I/O boards. Cylinder Control Units (#CCU) / Injection Control On electronically-controlled engines, each cylinder has a solenoid-controlled fuel injection valve. The ECU controls these solenoid valves with precise timing. WECS 9520 determines: • #Injection timing (start of injection) • Injection duration (fuel quantity) • Cylinder balancing 3. #Sensor Modules WECS 9520 uses many digital and analog inputs: • Speed #pickup / crankshaft encoder • Scavenge temperature sensors • Charge air pressure and temp • Lubricating oil pressure & temp • Fuel pressure • Knock sensors (on some models) All these signals go through WECS I/O boards. 4. Actuators and Valves Controlled by WECS: • Fuel injection solenoids • Start air valves • Fuel rack (if mechanical-electronic hybrid) • #Wastegate / turbo control • Shutdown solenoids 5. #HMI / Engine Control Panel (#ECP) This is the user interface on the engine or on the bridge/ERS: • Start/Stop buttons • Operating modes (Local / Remote) • Alarm display • Parameter viewing (temperatures, pressures, speed) • Trend pages • Fault diagnostic How the System Works — Simple Overview 1. Start Sequence WECS automatically performs: • Pre-lubrication check • Turning gear check • Start air sequence • Fuel injection enable • Ramp-up to idle speed All logic is internal; operator only presses Start. 2. Running Operation During operation WECS continuously: • Monitors all sensors • Controls injection quantity based on load command • Adjusts turbocharger control • Balances cylinders • Prevents overload or knocking • Logs alarms 3. Stop Sequence WECS safely: • Cuts off fuel • Closes start valves • Executes post-lubrication • Performs run-down checks • Logs “Engine Stopped” status WECS 9520 Protections & Alarms Typical shutdowns controlled by WECS: • Overspeed • Low lube oil pressure • High temperature • Crankcase mist / oil mist detector • Emergency stop • Fuel leakage detection • Start failure Alarms are prioritized (High, Medium, Low). Communication WECS 9520 communicates via: • CAN bus (for cylinder units) • RS-485 or Ethernet to the main ship automation system • Modbus (on some engines) This sends parameters to the alarm monitoring system, PMS, and remote control. Maintenance & Troubleshooting (Quick Guide) 1. ECU Status LEDs Check power supply, CAN bus, I/O board health. 2. Sensor Calibration WECS 9520 is sensitive to: • Faulty speed pickup • Wrong T/C pressure signals • Bad L.O. pressure sensors Bad sensors cause derate or “Emergency Mode”. 3. Logs / Error Codes ECP display allows viewing: • Active alarms • Stored historical alarms • Injection faults • CAN communication faults 4. Backup & Configuration WECS uses configuration files with engine parameters.

ACB Maintenance #ACB #Maintenance

⭐ #Star (Y) Connection What it is The three #windings of the motor are connected so that one end of each #winding is joined together at a common point (neutral). The other ends connect to the three-phase supply. Characteristics • Phase voltage = Line voltage / √3 (≈ 58% of full voltage) • Starting current is lower (about 1/3 of delta) • Starting torque is lower (about 1/3 of delta) Where it is used • During #motor starting to reduce inrush #current • On light-load start motors • For star–delta starters 🔺 #Delta (Δ) Connection What it is The windings are connected end-to-end in a triangle. Each winding receives the full line #voltage. Characteristics • Phase voltage = Line voltage • Full rated current • Full rated torque • Higher starting current Where it is used • For normal running of the motor • When full torque is required • For motors designed for Δ run ⚡ Star–Delta Starting (Y–Δ) This is a common method to start large motors smoothly. Why it’s used • Reduces starting current to about 30–35% of direct-on-line (#DOL) • Reduces mechanical shock • Protects the electrical network from voltage dips How it works 1. Start in Star → lower voltage on each winding → low current, low torque 2. After a few seconds (motor reaches 70–80% speed)… 3. Switch to Delta → full voltage → full torque for normal running

What R-S-T Means in Three-Phase Electrical Systems R, S, and T are traditional names for the three #phases of an #AC three-phase power system. They are commonly used in Europe, Asia, and especially in industrial and marine electrical installations. 1. What the letters mean The letters do not have special meanings. They simply represent: • R = Phase 1 (L1) • S = Phase 2 (L2) • T = Phase 3 (L3) This naming system was adopted in older European standards and is still widely used. 2. Why R-S-T is used R-S-T helps identify: • the three power lines in a three-phase system, • the phase rotation (R → S → T), • correct connection of motors, generators, switchboards, and #MCCs. Maintaining the correct order (R-S-T) is important for equipment that depends on rotation direction, such as motors and pumps. 3. Relation to modern designations Today, international standards (#IEC) prefer: • L1, L2, L3 But R-S-T is still common in: • marine systems, • generator panels, • industrial switchgear, • old European installations. #RST

On 15 March 2025, the gas carrier Gaschem Homer experienced a loss of #propulsion and #steering while manoeuvring in the Port of Brisbane, Queensland. The Australian Transport Safety Bureau (#ATSB) investigated the incident and released its final report on 19 November 2025. What Happened • The vessel was departing its berth and performing a turning manoeuvre in the harbour channel. • During this manoeuvre, the ship suffered a complete electrical #blackout, leading to a loss of propulsion and rudder control for approximately two minutes. • The blackout occurred when the bow thruster was engaged, causing a sudden increase in electrical load. Cause of the Blackout • The ship had three auxiliary diesel generators. • Before departure, two generators were left in manual mode instead of automatic, contrary to safe operating practice. • When the #bowthruster load increased, one generator overloaded and tripped. • The other #generators did not automatically take over the load because they were not configured in the auto mode, resulting in a total loss of electrical power. • No injuries or damage occurred, but the loss of control inside a confined harbour channel was classified as a serious #incident. ATSB Findings • The vessel’s Safety Management System (SMS) used generalized fleet-wide procedures that did not reflect the specific requirements and power system configuration of Gaschem Homer. • Pre-departure checks were too generic and did not clearly define responsibilities or steps for generator mode verification. • The crew relied heavily on memory rather than structured, ship-specific procedures — which increased the risk of error. • The incident occurred due to a combination of inadequate procedures, improper generator configuration, and insufficient adaptation of #SMS to vessel-specific systems. Actions Taken After the Incident • The operator updated its risk controls and procedures. • Checklists were rewritten to require generators to be in AUTO mode before manoeuvring. • A power consumption matrix was introduced to manage electrical loads during port operations. • Training for engineers was enhanced, focusing on generator management and load-sharing principles. Why This Matters • The event highlights how even short power losses during #manoeuvring can create significant risks. • Safety procedures must be updated, ship-specific, and easy to use. • Proper load management and #generator mode selection are essential for safe navigation, especially in restricted waters. Official Sources • ATSB news release: https://www.atsb.gov.au/media/news-items/2025/gas-carrier-loss-propulsion-highlights-importance-date-and-usable-procedures • Full ATSB report (PDF): https://safety4sea.com/wp-content/uploads/2025/11/ATSB-Loss-of-propulsion-Gaschem-Homer-2025_11.pdf #news

Loose Wire on Containership Dali Leads to Blackouts and Contact with Baltimore’s Francis Scott Key Bridge Date: November 18, 2025 Key Points: • A single loose #wire in the electrical system of the 984-foot long #containership Dali caused an electrical blackout. • The #blackout led to the vessel losing both propulsion and steering while passing near the Francis Scott Key Bridge (Key Bridge) in Baltimore, and the ship contacted the bridge structure. • The incident occurred on March 26, 2024; the bridge collapse followed, resulting in the deaths of six highway workers. • The investigation revealed that the wire-label banding prevented the wire from being fully inserted into a terminal-block spring-clamp, causing an inadequate connection which triggered a #breaker to trip. • During the series of events: after the first blackout the ship’s heading swung toward Pier 17 of the Key Bridge; despite efforts by pilots and shoreside dispatchers, the loss of #propulsion close to the bridge made avoiding the collision impossible. • The size of the #ship and the lack of bridge design counter-measures for large ocean-going vessels contributed to the severity of the event. For example, an earlier collision by the ship Blue Nagoya in 1980 (390 ft long) caused only minor damage; the Dali was about ten times the size. • As a result of the investigation, NTSB issued a series of safety recommendations to multiple parties including the United States Coast Guard, the Federal Highway Administration, bridge-owners nationwide, and electrical-component manufacturers. • #NTSB emphasised that this incident was preventable, and that implementation of the recommendations is essential to avoid similar tragedies in the future. 🔗 Link to the news ➡️ https://www.ntsb.gov/news/press-releases/Pages/NR20251118.aspx #news

MSB Maintenance #MSB #DD #DryDock

Gel batteries (#GEL) are a type of sealed lead-acid battery in which the electrolyte is thickened into a gel by adding silica. They belong to the #VRLA (Valve Regulated Lead Acid) family — maintenance-free, sealed batteries with pressure-relief valves. Advantages of Gel #Batteries • Sealed and maintenance-free — no water topping-up, minimal gas emission. • Long service life — typically 6–12 years in standby applications. • Deep-cycle capable — handle deep discharges better than AGM batteries. • Vibration resistant — suitable for marine environments. • Safe — very low risk of acid leakage. • Wide operating temperature range — around −20 to +50 °C (model-dependent). Disadvantages • More expensive than AGM or flooded lead-acid batteries. • Lower charge current tolerance — require precise charge control. • Sensitive to overcharging, especially at high temperatures. Typical Applications • Marine systems (emergency power, communication systems). • #UPS (Uninterruptible Power Supplies). • Solar and off-grid power systems. • Electric vehicles and medical equipment. Charging Parameters Proper charging is critical for long battery life: • Bulk/Absorption voltage: 14.0–14.4 V (for a 12 V battery). • Float #voltage: 13.5–13.8 V. • Charge current: typically 0.1C (10% of capacity). • Temperature compensation: about −3 mV/°C per cell. How to Identify a Faulty Gel Battery • Significant capacity loss (over 30% drop). • Strong voltage drop under load. • #Battery gets unusually warm while charging. • Swelling of the case (critical sign). • High internal #resistance during testing.

Shore Power Supply ⚡️⚠️ (short instruction) #DD #DryDock #ShoreConnection

Shore Power Supply ⚡️⚠️ #DD #DryDock #ShoreConnection

Terasaki ANU-1 OCR Checker The ANU-1 is a dedicated test instrument from Terasaki for verifying the functionality of Over-Current Relays (#OCRs) in circuit breakers. • Typical model reference: “AC110-240 V ANU-1 OCR Checker”. • It is described as “compact and portable” for field-testing OCRs (over-current releases) in industrial/utility installations. What functions does it check? ANU-1 is capable of checking the following: • Long time-delay trip (pickup and time) • Short time-delay trip (pickup and time) • Instantaneous trip (pickup current) • Ground-fault trip (pickup and time) • Pre-trip alarm function (for breakers with a pre-alarm before full trip) So if you are dealing with breakers (or ACB/OCR combinations) that have multiple stage over-current protection, this instrument is very useful. Key Specifications & Features • Supply voltage: AC 110-240 V (50/60 Hz) version. • Power consumption: Approximately 7 VA. • Single connector interface for the OCR under test (simplifies field connection). • Clear LCD display showing the function, phase output and trip signal indicators. • Light weight (in one rental listing: ~1 kg) and portable carrying case. Typical Use Cases — Relevant to your site work Given your context (ships, switchgear, protection systems), here’s how this tool comes in handy: • If you need to verify the OCR section of a breaker (especially the over-current release unit) after settings changes or installation, the ANU-1 lets you simulate fault currents and trip times. • On board a vessel, especially when you have ACBs (#aircircuitbreakers) with OCRs, this tool helps confirm that the over-current protection is still within spec (pickup/trip time) and that the pre-trip alarm (if present) is functioning. • For maintenance or commissioning of switchgear, you can use the ANU-1 to validate the OCR without having to fully load the circuit or create actual fault conditions — saving risk and downtime. Important Usage & Safety Notes A few key cautions pulled from the manual and associated documentation: • Before testing, isolate the #breaker under test (ensure upstream circuit breaker is open, remove control power, etc.). • After testing or changing OCR settings, return settings to original values. Failure to do so may cause fire or burnout. • The instrument itself is electronic; avoiding shock, dropping or mechanical damage is important. • Make sure during connection that the current being applied does not exceed permissible values for the OCR or wiring (excess current may damage the breaker or the tester). • Ensure the device is connected properly, power off while connecting/disconnecting to avoid inadvertent trip. How this relates to your environment (ships, switchgear, etc) Given your work with marine electrical systems, parallel generators, #protection etc, here’s how this tool could support you: • On board ship #switchgear with #ACBs that include OCRs, you can carry the ANU-1 to check OCR functionality in situ after maintenance or fault events. • When you suspect an over-current protection issue (e.g., nuisance trips, no trip when expected) in a breaker’s OCR unit, you can use the #ANU-1 to measure pickup/trip values and compare to the breaker/OCR spec. • If the breaker’s #OCR has undergone setting changes (for example to adapt to changed loading conditions), you can validate those changes using the ANU-1 to ensure compliance with protective requirements. • In a #vessel environment, where downtime is critical and fault simulation is high risk, using a dedicated OCR tester like this reduces the need for full fault injection or burning equipment.

The green discs are #varistors (MOV – Metal Oxide Varistors). They are mounted across the #transformer terminals as overvoltage protection devices. Their purpose: • absorb #voltage spikes and surges (lightning, switching spikes, generator noise); • #protect the transformer windings and downstream electronics; • clamp the voltage to a safe level by diverting excess energy to ground. ✅ Why there are three of them, and why they are connected to ground You normally place one #MOV on each phase, connected: Phase → MOV → Ground This way, any surge on any #phase is discharged safely to ground. This is a standard arrangement in: • marine control equipment, • power supplies, • #UPS input filters, • automation transformers. ✅ How to know if a varistor is faulty ✅ 1. Visual inspection A bad MOV usually shows: • cracks in the disk, • dark burn marks, • pieces of coating missing, • a burnt smell, • swelling. ✅ 2. #Multimeter test A good MOV shows very high #resistance at low voltage. If your meter shows: • Low resistance (a few ohms) → the MOV is shorted (failed) • Normal infinite resistance → likely OK (or open-circuit, which also means no protection) You cannot fully test the MOV without high-voltage equipment, but a shorted MOV is easy to detect. ✅ 3. Symptoms in the system If a MOV is shorted: • #breakers/ fuses blow, • transformer hums heavily, • input voltage drops, • the device won’t power up. If a MOV is open-circuit: • the system works normally • but you have no surge #protection anymore. ✅ How to check if the #transformer itself is healthy • Measure winding resistance (similar between phases if 3-phase). • Check no-load current (should be small). • Measure output voltage under load. • Ensure no #overheating.

A Multipurpose Controller (#MPC) in a #MAN B&W main engine is a modular electronic controller used in the ME-engine control and safety system. It is part of the ECS (Engine Control System) and handles specific control tasks, depending on how it is configured. ✅ Main purpose of the MPC The MPC is essentially a #PLC-type module placed inside the #Engine Control Room (ECR) cabinet or local control cabinets. Each MPC is assigned one or more functions, such as: ✅ Typical functions of MPC modules on MAN ME engines Depending on the engine type (ME, ME-C, ME-B), MPCs may handle: 1. Fuel Injection Control • Controls the Hydraulic Cylinder Units (#HCUs) • Controls timing and quantity of injection • Receives feedback from #MOP sensors, #FIVA valves, pressure sensors 2. Exhaust Valve Control • Commands opening/closing via hydraulic oil distributor • Monitors valve position feedback 3. #Cylinder Lubrication Control • Controls Alpha Lubricators • Adjusts cylinder oil feed rate based on load, #SFOC, sulfur level 4. Safety Monitoring • Monitors critical sensors: • Scavenge air pressure • Exhaust temp • Fuel rail pressure • Hydraulic oil pressure • Turning gear position • Can initiate slowdown, shutdown, or load reduction 5. Starting Air System Control • Controls air start valves • Monitors starting air distributor signals 6. Auxiliary Systems • Maneuvering commands • Governor interface • Shaft generator logic (on some setups) ✅ Communication The MPC communicates with: • #DCU (Diesel Control Unit) on each cylinder • #ECS Main Controller (#SIGMA, #CoCoS, or later versions EICU) • Scavenge air temp controller • Bridge and ECR interfaces • Communication is typically via redundant #CANbus or MAN proprietary bus. ✅ Hardware features • Modular I/O board (analog & digital) • #CPU board • Power supply section • Rugged design for vibration & heat • Hot-swappable in some engine versions ✅ Typical number of MPCs A typical #ME engine has several MPCs, e.g.: • MPC-A – Fuel system • MPC-B – Exhaust valves • MPC-C – Safety & protection • MPC-L – Cylinder lubrication (Names differ by project and wheelhouse specification.) ✅ If you are troubleshooting Common MPC issues include: • “MPC Communication Lost” • “MPC I/O Board Error” • Faulty 24V supply • CAN bus errors • Loose connector pins • Firmware mismatch after replacement

Replacing a synchronous motor on an anemometer ℹ️ Related article ➡️ The anemometer gives false readings. Troubleshooting https://www.eto-engineer.com/2023/09/the-anemometer-gives-false-readings.html #anemometer