4.0 Troubleshooting; Table 6, Troubleshooting Guide - Magnum Energy MM Series Owner's Manual

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.
Symptom
Low Battery Voltage
(the status indicator
blinks on 1 time every
4 secs)
High Battery Voltage
(the status indicator
blinks on 2 times every
4 secs)
Over-temperature
condition
(the status indicator
blinks on 3 times every
4 secs)
AC Overload
(the status indicator
blinks on 4 times every
4 secs)
Internal fault
(the status indicator
blinks on 5 times every
4 secs)
Inverter's status light
is off.
AC input won't connect
(AC IN on remote
blinks)
Appliances turn off and
on; or there is low AC
output power.
Inverter AC output
voltage is too low or
too high when using an
AC voltmeter.
While charging, the DC
charge voltage is
higher or lower than
expected.
© 2010 Magnum Energy, Inc.

Table 6, Troubleshooting Guide

Possible cause
The battery voltage level has dropped
below the Low Battery Cut Out (LBCO)
set-point for more than one minute
(10.0VDC = LBCO default setting).
The battery voltage is above 15.5 VDC.
The inverter automatically resets and
resumes operation when the battery
voltage drops below 15.5 VDC.
The internal temperature of the
inverter has risen above acceptable
limits; caused by loads too great for
the inverter to operate continuously, or
by lack of ventilation to the inverter.
When the unit has cooled, it will
automatically reset and resume
operation.
The inverter has turned off because the
connected loads are larger than the
inverters output capacity or the output
wires are shorted.
This fault occurs when an internal fault
is detected.
Inverter is switched OFF or there is no
DC voltage (battery) connected to
inverter.
The incoming AC voltage will not be
accepted if it is below the VAC Dropout
setting (80VAC = VAC Dropout default
setting).
Loose AC output connections.
Loose / corroded battery cables.
Low batteries.
Wrong type of voltmeter used (will
display 90 VAC to 130 VAC depending
on the battery voltage).
If the Battery Temperature Sensor is
installed, it will increase or decrease
the DC voltage level depending on
temperature around the battery
sensor.
4.0 Troubleshooting
Recommended Solution
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.
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