Magnum Energy MM Series Installation And Operation Manual

Contents

Magnum Energy MM Series Installation And Operation Manual Manual pdf 28 page image

©2006 Magnum Energy Inc.223.0 OperationOperating ModesThe MM Series inverter has two normal modes of operation; 1. InvertMode, which powers your loads using the batteries, and 2. TransferMode, which powers your loads from the incoming AC Power (i.e. utilitypower or a generator). This inverter also has extensive protectioncircuitry and will go into the Protection Mode under certain fault condi-tions.Invert ModeIn Invert Mode, the inverter supplies AC power to your appliances byinverting the DC power from the battery. The amount of time theinverter can provide power is directly related to the capacity of thebattery (or battery bank).Transfer ModeThe inverter will automatically go into the Transfer Mode whenever anexternal AC source is connected and allowed to pass-thru to power yourAC loads. While in the Transfer mode, the AC input is continuallymonitored to ensure it remains between 80 VAC (determined by the ‘AdjVAC dropout’ setting) and 140 VAC. The status LED indicator will be on(Transfer Mode) or blink off every four seconds (battery charging) toindicate that the inverter is passing the input AC power to the outputand monitoring the AC input. Whenever AC power is disconnected orfalls below the 80 VAC threshold, the inverter automatically transfersback to the Invert Mode with minimum interruption to your appliances -as long as the inverter is enabled (turned on).Transfer time - When the AC power falls below the VAC dropoutthreshold voltage (80 VAC, default setting), the relay transfers fromTransfer Mode to the Invert Mode in about 16 milliseconds. While theMM Series is not designed as a computer UPS system, this transfertime is usually fast enough to hold them up. However, the VACdropout setting has an effect on the ability of the loads to transferwithout resetting. The lower this setting, the longer the effectivetransfer will be and therefore, the higher the probability for the outputloads to reset. This occurs because the incoming AC voltage is allowedto fall to a level that is so low, that when the transfer does occur (inaddition to the relay transfer time), the voltage from the invertersoutput has already fallen to a low enough level to reset the loads.The disadvantage of a higher VAC dropout setting is that smallergenerators (or large generators with an unstable output) may nuisancetransfer. This commonly happens when powering loads that are largerthan the generator can handle - causing the generators output toconstantly fall below the inverters VAC dropout threshold.When switching from Invert Mode to the Transfer Mode, the inverterwaits approximately 15 seconds to ensure the grid is stable (or thegenerator is up to speed) and then makes the transfer in approximately8 milliseconds.3.0 Operationhttp://www.wholesalesolar.com/inverters.htmlhttp://www.wholesalesolar.com/inverters.html