Generator Alarms And Trips
Marine Engines Shipping Industry

Diesel Generator Alarms and Trips

Diesel Generator Alarms and Trips have been discussed in this article, which are common among all the generators. We will take some of the major alarms and trips. Also we will give reasons for such alarms occurring and troubleshooting to be done.

Following alarms we will mention

  • HT Water Temperature High High
  • Low Lube Oil Pressure
  • Fuel Oil Pressure Low
  • Low Lube oil level in Sump
  • Over speed Alarm
  • Exhaust Temperature Deviation Or High
  • Pre Lubrication Pressure Less
  • Oil Mist Detector High

Diesel Generator Alarms and Trips

HT Water Temperature High


  1. Cooling Water Coming Is of High temperature
  2. Engine is suddenly overloaded
  3. Air in the system
  4. sensor is incorrect


Check if LT temperature is all right

Exhaust temperature of individual unit to be checked

Vent the system

Check sensor

Low Lube Oil Pressure


Pump Failure

  1. Wrong Sensor Value or Gauge Malfunction
  2. Oil pressure control valve of engine.
  3. Oil Filters
  4. Oil Cooler Dirty

Actions: Check above for the problem and rectify the same.

Fuel Oil Pressure Low


  1. Fuel Oil Filter Dirty
  2. fuel oil supply pump malfunction
  3. Fuel oil inlet valve throttled or not fully open

Sensor Malfunction.

Actions: Rectify the above reasons. Also when you changeover to other fuel oil grade line DO, the filters tends to get dirty very fast. So, a low fuel oil pressure alarm comes in.

Low Lube oil level in Sump


Sump Level Low

Too much consumption of lube oil

Oil Cooler Leakage

Actions: If the alarms comes frequently that means, engine is consuming too much of lube oil. This means that the piston rings are leaking and lube oil is getting burned away.

Over speed Trip


  1. Governor failure or faulty
  2. Fuel rack for a unit is stuck
  3. Sudden change in the load

Actions: Sudden change of load occurs like when the engine is loaded with high load suddenly.

Exhaust temperature deviation Alarm


  1. Fuel rack position for unit is wrongly calibrated
  2. Fuel Pump Defective
  3. Fuel injector Defective
  4. Engine is not balanced
  5. Sensor is touching the engine body.
  6. Engine is overloaded

Actions: Do the performance check of the engine. And check the PV diagrams. If something is wrong than, either the injector or fuel pump is faulty.

Balancing of power from all units to be done at the load instructed by the engine maker and fuel racks to be adjusted as per that.

Pre Lubrication Pressure Low


Pre Lubrication Pump is not working properly

Clogged Strainer for pump

Faulty pressure sensor or gauge

Air in the system

Actions: Check the system for air and release it by slightly opening the fitting to the sensor and let it release.

Oil Mist High Alarm


1) Lubrication failure inside the rotating machinery, leading to the activation of oil mist detector alarm

2) Purifier oil inlet temperature kept too high, leading to accumulation of mist inside the crankcase as oil is heated too much.

3) Dirty Sensor for the oil mist detector.

Action: If you get oil mist level high level, the engine will slow down and shut down. Open the crankcase doors to check the signs of hotspots.

Keep the purifier inlet temperature as per the manufacturer.

Regularly clean the oil mist detector head for avoiding the false alarms.

Generator Alarms and Trips- Trips

Note: Most of the alarms won’t trip the generator, but there are some major alarms which will cause the generator to trip and they are as follows:

Low Lube Oil Pressure

When this alarm is activated, generator will shut down immediately.

High HT Cooling Water Temperature

This alarm too leads to shutdown of the generator immediately.

Over speed Trip

If the generator senses the over speed, it will suddenly reduce the speed and shutdown.

This was all from the article on  generator alarms and trips.

Ashish S
Hi there! Well I am not a writer, just writes what can help people-that's it. Interested in listening from you. Loves to talk about gadget, music, nerdy stuff and witty substance in the talks. A Good respect in heart- for web.

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