Magnum Energy MMS1012 Owner's Manual

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Magnum Energy MMS1012 Owner's Manual Manual pdf 44 page image

© 2010 Magnum Energy, Inc.384.0 Maintenance and TroubleshootingTroubleshootingThe MMS Series inverter/charger is a fairly simple device to trouble-shoot. There are only two active circuits (AC and DC), as well as acharging circuit. The following chart is designed to help you quicklypinpoint the most common inverter and charger faults.Table 7, Troubleshooting GuideSymptom Possible cause Recommended SolutionLow Battery Voltage(the status indicatorblinks on 1 time every4 secs)The battery voltage level has droppedbelow the Low Battery Cut Out(LBCO) set-point for more than oneminute (10.0VDC = LBCO defaultsetting).Battery voltage is too low. Check fuses/circuit-breakers and cable connections.Check battery voltage at the inverter'sterminals. Your batteries may needto be charged, this fault condition willautomatically clear when the batteryvoltage exceeds 12.5VDC.High Battery Voltage(the status indicatorblinks on 2 timesevery 4 secs)The battery voltage is above 15.5VDC. The inverter automaticallyresets and resumes operation whenthe battery voltage drops below 15.5VDC.This condition usually occurs only whenan additional charging source (alternator,solar panels or other external chargingsources) is used to charge the batterybank. Reduce or turn off any othercharger to the inverter batteries to allowthe voltage level to drop.Over-temperaturecondition(the status indicatorblinks on 3 timesevery 4 secs)The internal temperature of theinverter has risen above acceptablelimits; caused by loads too great forthe inverter to operate continuously,or by lack of ventilation to theinverter. When the unit has cooled, itwill automatically reset and resumeoperation.Reduce the number of electrical loadsthat you are operating, this will avoid arepeat Over-temp shutdown if the causewas too many loads for the ambientconditions.Check ventilation around the inverter,ensure cool air is available to pass-thruthe inverter.AC Overload(the status indicatorblinks on 4 timesevery 4 secs)The inverter has turned off becausethe connected loads are larger thanthe inverters output capacity or theoutput wires are shorted.Reduce the AC loads connected to theinverter or remove all AC output wiringand restart the inverter.Internal fault(the status indicatorblinks on 5 timesevery 4 secs)This fault occurs when an internalfault is detected.To clear this fault, an inverter resetis required. Remove DC power to theinverter or press and hold down thepower switch on the inverter for 15seconds (until the green Status LEDcomes on). If this fault does not clear, theunit will need to be serviced.Inverter's status lightis off.Inverter is switched OFF or there isno DC voltage (battery) connected toinverter.Switch the inverter ON. Connect a batterywith correct voltage to the inverter.AC input won't connect(AC IN on remoteblinks)The incoming AC voltage will notbe accepted if it is below the VACDropout setting (80VAC = VACDropout default setting).Check the incoming AC voltage to theinput of the inverter, ensure it is presentand above the VAC dropout level.Appliances turn offand on; or there is lowAC output power.Loose AC output connections. Tighten AC output connections.Loose / corroded battery cables. Clean and tighten all cables.Low batteries. Recharge or replace batteries.Inverter AC outputvoltage is too low ortoo high when usingan AC voltmeter.Wrong type of voltmeter used (willdisplay 90 VAC to 130 VAC dependingon the battery voltage).Most meters are made to read AverageAC voltage. The AC output of the MM is a"modified" waveform which requires usinga “true” RMS voltmeter to correctly readthe output voltage.While charging, theDC charge voltage ishigher or lower thanexpected.If the Battery Temperature Sensor isinstalled, it will increase or decreasethe DC voltage level depending ontemperature around the batterysensor.This is normal.