Testing Auto-Start on a Ship's Emergency Switchboard

GA - No sooner farewell to following seas can be had...than failing to follow such advice.

yes u r crrt....every ship has its own manual....no problem in that....but the problem is i'm a marine engineering student studying in uk....i have no sea experience...i dont know how the auto start of an emergency switchboard is tested,while the main engine is in operation.......(mainly how the mains failure relay react to auto start operation)......

The best way to test this is to turn off the main power, this is normally done by the ships class service every year or every other year depending on few factors. This way you get absolutely correct result. But I advice you to do this only at shore when the ship is not in action.Normally there is no need to test this often. But If you are sure you want to do this then you have to start with disabling the main switch for the aux power and then un-connect the voltage sensor "relay" that activates the aux engine, then it should fire up and then you should be able to measure control voltage to the main switch from the aux engine, but this way you can not be sure of that the main switch from the aux engine is working, so the result of this test is nothing to rely on. As mentioned before the best way is to go all the way and turn off the main power, you just have to find a quiet time to do this, like when every body exept you go for a vacation. Good luck.

Make sure your Emergency Genny switch is set to "Auto" operation, then open the Emergency Bus Tie breaker.

This will simulate a loss of power to the Main bus, which should, under normal circumstances, be supplying power to the "E"-bus also.

If your programming is set up for it,(and it should be), the EDG should start up, come online, and the genny breaker to the "E" bus should close, allowing the EDG to power the "E" bus in isolation from whatever is happening on the Main bus.