LEOK
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This is not about any particular generator, mostly about learning about how they work and loads. This is new 36kva Perkins turbo/meccalte single phase alternator and a Deep Sea 7320 line monitoring controller
learning curve about loads. The 36kva genset set shutdown, Deep sea controller watches everything. The logs showed over and under voltage, frequency, and current. About three hours in while still waiting for power Co to put the meter back in the over voltage crossed the limit setting. So that lead to investigation on the AC, Turns out the starting load is huge locked rotor is 150 amps. The settings on the controller were set for zero tolerance so when house load increased due cooking diner that threshold was crossed. So not have any real experience with the controller a deep read on the manual was needed. Turns out the limits have tolerance setting so I opened them from zero to five seconds. There was another setting called short circuit with Amp setting of 200 amps. with setting called Electrical trip IDMT or shutdown I change it to Shutdown from trip and raised it to 300 amps. Knowing that large motors look like short circuit at start up. Loaded the new config and as soon as the AC came on the gen shutdown, log showing short circuit. So more reading, turns out IDMT is power curve of time versus overload. The higher overload the less time it will allow a run. So tomorrow we will try the 5 second delay and Electrical Trip setting enabled. When we choose this particular Alternator I spoke with MeccAlte and the engineer explained the rotor construction. He recommend the model with iron core rather than the Aluminium explaining how the dedicated single phase iron core can handle loads better especially motor that start under a load like pumps. Who would have thought the surge from an AC that only draws 7k watts running would surge past 300A on startup.
learning curve about loads. The 36kva genset set shutdown, Deep sea controller watches everything. The logs showed over and under voltage, frequency, and current. About three hours in while still waiting for power Co to put the meter back in the over voltage crossed the limit setting. So that lead to investigation on the AC, Turns out the starting load is huge locked rotor is 150 amps. The settings on the controller were set for zero tolerance so when house load increased due cooking diner that threshold was crossed. So not have any real experience with the controller a deep read on the manual was needed. Turns out the limits have tolerance setting so I opened them from zero to five seconds. There was another setting called short circuit with Amp setting of 200 amps. with setting called Electrical trip IDMT or shutdown I change it to Shutdown from trip and raised it to 300 amps. Knowing that large motors look like short circuit at start up. Loaded the new config and as soon as the AC came on the gen shutdown, log showing short circuit. So more reading, turns out IDMT is power curve of time versus overload. The higher overload the less time it will allow a run. So tomorrow we will try the 5 second delay and Electrical Trip setting enabled. When we choose this particular Alternator I spoke with MeccAlte and the engineer explained the rotor construction. He recommend the model with iron core rather than the Aluminium explaining how the dedicated single phase iron core can handle loads better especially motor that start under a load like pumps. Who would have thought the surge from an AC that only draws 7k watts running would surge past 300A on startup.
