4.0 Troubleshooting; Table 6, Troubleshooting Guide - Magnum Energy MM Series Installation And Operation Manual

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4.0 Troubleshooting

The MM Series inverter is a fairly simple device to troubleshoot. There
are only two active circuits (AC and DC) as well as a charging circuit in
some of the models. The following chart is designed to help you
quickly pinpoint the most common inverter and charger faults.

Table 6, Troubleshooting Guide

Symptom
Low Battery Voltage The battery voltage level has dropped
(the status indicator below the Low Battery Cut Out (LBCO)
blinks on 1 time every set-point for more than one minute
4 secs) (10.0VDC = LBCO default setting).
High Battery Voltage The battery voltage is above 15.5 VDC.
(the status indicator The inverter automatically resets and
blinks on 2 times every resumes operation when the battery
4 secs) voltage drops below 15.5 VDC.
Over-temperature The internal temperature of the
condition inverter has risen above acceptable
(the status indicator limits; caused by loads too great for
blinks on 3 times every the inverter to operate continuously, or
4 secs) by lack of ventilation to the inverter.
When the unit has cooled, it will
automatically reset and resume
operation.
AC Overload The inverter has turned off because the
(the status indicator connected loads are larger than the
blinks on 4 times every inverters output capacity or the output
4 secs) wires are shorted.
Internal fault This fault occurs when an internal fault
(the status indicator is detected.
blinks on 5 times every
4 secs)
Inverter's status light Inverter is switched OFF or there is no
is off. DC voltage (battery) connected to
inverter.
AC input won't connect The incoming AC voltage will not be
(AC IN on remote accepted if it is below the VAC Dropout
blinks) setting (80VAC = VAC Dropout default
setting).
Appliances turn off and Loose AC output connections.
on; or there is low AC
Loose / corroded battery cables.
output power.
Low batteries.
Inverter AC output Wrong type of voltmeter used (will
voltage is too low or display 90 VAC to 130 VAC depending
too high when using an on the battery voltage).
AC voltmeter.
While charging, the DC If the Battery Temperature Sensor is
charge voltage is installed, it will increase or decrease
higher or lower than the DC voltage level depending on
expected. temperature around the battery
sensor.
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Possible cause
Battery voltage is too low. Check
fuses/circuit-breakers and cable
connections. Check battery voltage at the
inverter's terminals. Your batteries may
need to be charged, this fault condition will
automatically clear when the battery
voltage exceeds 12.5VDC.
This condition usually occurs only when an
additional charging source (alternator,
solar panels or other external charging
sources) is used to charge the battery
bank. Reduce or turn off any other charger
to the inverter batteries to allow the
voltage level to drop.
Reduce the number of electrical loads that
you are operating, this will avoid a repeat
Overtemp shutdown if the cause was too
many loads for the ambient conditions.
Check ventilation around the inverter,
ensure cool air is available to pass-thru the
inverter.
Reduce the AC loads connected to the
inverter or remove all AC output wiring and
restart the inverter.
To clear this fault, an inverter reset is
required. Remove DC power to the inverter
or press and hold down the power switch
on the inverter for 15 seconds (until the
green Status LED comes on). If this fault
does not clear, the unit will need to be
serviced.
Switch the inverter ON. Connect a battery
with correct voltage to the inverter.
Check the incoming AC voltage to the input
of the inverter, ensure it is present and
above the VAC dropout level.
Tighten AC output connections.
Clean and tighten all cables.
Recharge or replace batteries.
Most meters are made to read Average AC
voltage. The AC output of the MM is a
"modified" waveform which requires using
a "true" RMS voltmeter to correctly read
the output voltage.
This is normal.
4.0 Troubleshooting
Recommended Solution
27