In a hotel project there are 3 suites feeded with 3phase power. There is also a stand by generator which takes the loads after some seconds of power cut. Can anyone explain why on the 2 of the 3 suites, when the generator start to operate, the 1st channel of a L5512 close its contact without opening the indication light on the relay? As a result a shutter start to operate. When someone press the button 2 times the relay start to operate normal again. Any ideas? PS: I am sorry for my difficulty to express myself in English