Magnum Energy MMS1012 Owner's Manual

Also see for MMS1012: Owner's manual

Contents

Magnum Energy MMS1012 Owner's Manual Manual pdf 34 page image

© 2010 Magnum Energy, Inc.3.0 Operation28Standby ModeThe MMS Series features an automatic transfer relay and an internalbattery charger when operating in Standby Mode. Standby Modebegins whenever AC power (shore power or generator) is connectedto the inverter’s AC input. Once the AC voltage and frequency of theincoming AC power is within the AC input limits, an automatic ACtransfer relay is activated. This transfer relay passes the incoming ACpower through the inverter to power the AC loads on the inverter’soutput. This incoming power is also used to activate a powerful in-ternal battery charger to keep the battery bank charged in case ofa power failure.Battery charging - The MMS Series models are equipped with anactive Power Factor Corrected (PFC) multi-stage battery charger. ThePFC feature is used to control the amount of power used to chargethe batteries in order to obtain a power factor as close as possible to1 (or unity). This causes the battery charger to look like a resistor tothe line (forces the charge current waveshape to mirror the voltagewaveshape). This feature maximizes the real power available fromthe AC power source (shore power or generator), which translatesinto less power wasted and a greater charging capability than mostchargers available today.When an AC power source is connected to an inverter that has abattery charger, the inverter monitors the AC input for acceptablevoltage. Once the inverter has accepted the AC input, the AC transferrelay will close and charging will begin. Once charging, the DC voltageis monitored to determine the charging stage. If the DC voltage is low(≤12.9 VDC), the charger begins bulk charging. If the DC voltage ishigh (>12.9 VDC), the charger skips the initial Bulk/Absorb Chargingstages and goes directly to float charging.The multi-stage charger can use up to five different charging stagesto help monitor and keep the batteries healthy. The five stagesinclude an automatic 4-stage charging process (Bulk, Absorb, Float,and Full Charge), and a manual Equalization (EQ) charge stage. Theautomatic 4-stage charge process provides complete recharging andmonitoring of the batteries without damage due to overcharging (seeFigure 15). The Equalization stage (requires the ME-RC50 remote)is used to stir up stratified electrolyte and reverse any battery platesulfation that might have occurred.While charging, the unit may go into Charger Back-off protectionwhich automatically reduces the charge current to the batteries.This is caused by:1. The internal temperature is too hot – the charger automaticallyreduces the charge rate to maintain temperature; or,2. The AC input voltage falls < 85 VAC – the charger reduces the chargecurrent to zero to help stabilize the incoming AC voltage; or3. FET Temperature.