This isnt so much dropping the voltage but very rapid oscillation of the voltage (flicker). It affects not just the fire alarm, but everything in the house, especially incandescent lighting. I suspect that the fire alarm is triggered not by the low supply voltage, which should not affect it - It should after all run on battery power during a power outage - Instead, I believe its the interconnect on the fire alarms that are picking up what they believe to be an "activate" signal on the interconnect conductor, this signal being spurious noise resulting from the flicker on the mains.
We have already tried to isolate the fire alarms from the mains by fitting a RFI filter on the supply to them. This doesnt seem to have worked. The UK importer of SMA inverters doesnt appear to be interested, and neither are SMA in Germany. The customer is doing his nut, with a fire alarm that goes off frequently, accompanied by wild flickering on the mains. I fear we'll be ripping it all out shortly and putting in another type of turbine / inverter if we cant resolve it soon....
|SMA Inverter Oscillation||Bryan Rendall - 8/06|
|Re: SMA Inverter Oscillation||Ted Marynicz - 9/06|
|Re: SMA Inverter Oscillation||Stuart - 9/06|
|Re: SMA Inverter Oscillation||Bryan Rendall - 30/06|
|Re: SMA Inverter Oscillation||Ted Marynicz - 1/07|