Table 7, Troubleshooting Guide - Magnum Energy MMS1012 Owner's Manual

4.0 Maintenance and Troubleshooting
Troubleshooting
The MMS Series inverter/charger is a fairly simple device to trouble-
shoot. There are only two active circuits (AC and DC), as well as a
charging circuit. The following chart is designed to help you quickly
pinpoint the most common inverter and charger faults.

Table 7, Troubleshooting Guide

Symptom
Low Battery Voltage The battery voltage level has dropped
(the status indicator below the Low Battery Cut Out
blinks on 1 time every (LBCO) set-point for more than one
4 secs) minute (10.0VDC = LBCO default
setting).
High Battery Voltage The battery voltage is above 15.5
(the status indicator VDC. The inverter automatically
blinks on 2 times resets and resumes operation when
every 4 secs) the battery 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 the inverter to operate continuously,
every 4 secs) or 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 status indicator the connected loads are larger than
blinks on 4 times the inverters output capacity or the
every 4 secs) output wires are shorted.
Internal fault This fault occurs when an internal
(the status indicator fault is detected.
blinks on 5 times
every 4 secs)
Inverter's status light Inverter is switched OFF or there is
is off. no DC voltage (battery) connected to
inverter.
AC input won't connect The incoming AC voltage will not
(AC IN on remote be accepted if it is below the VAC
blinks) Dropout setting (80VAC = VAC
Dropout default setting).
Appliances turn off Loose AC output connections.
and on; or there is low
Loose / corroded battery cables.
AC 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 on the battery voltage).
an AC voltmeter.
While charging, the If the Battery Temperature Sensor is
DC 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.
38
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 Over-temp 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
"modifi ed" waveform which requires using
a "true" RMS voltmeter to correctly read
the output voltage.
This is normal.
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