Magnum Energy MMS-E Series - Manual (Page 42)

© 2011 Magnum Energy, Inc.
4.0 Maintenance and Troubleshooting
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4.4 Troubleshooting
The MMS-E 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 4-1, Troubleshooting Guide
Symptom Possible cause Recommended Solution
Low Battery Voltage
(the status indicator
blinks on 1 time
every 4 secs) The battery voltage level has
dropped below the Low Battery
Cut Out (LBCO) set-point for more
than one minute (10.0 VDC = LBCO
default setting). 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 12.5 VDC.
High Battery Voltage
(the status indicator
blinks on 2 times
every 4 secs) The battery voltage is above 15.5
VDC. The inverter automatically
resets and resumes operation when
the battery voltage drops below
15.5 VDC. 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.
Over-temperature
condition (the status
indicator blinks on 3
times every 4 secs) 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. 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.
AC Overload (the
status indicator
blinks on 4 times
every 4 secs) The inverter has turned off because
the connected loads are larger than
the inverters output capacity or the
output wires are shorted. Reduce the AC loads connected to the
inverter or remove all AC output wiring
and restart the inverter.
Internal fault (the
status indicator
blinks on 5 times
every 4 secs) This fault occurs when an internal
fault is detected. 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.
Inverter's status
light is off. Inverter is switched OFF or there is
no DC voltage (battery) connected
to inverter. Switch the inverter ON. Connect a
battery with correct voltage to the
inverter.
AC input won't
connect (AC IN on
remote blinks) The incoming AC voltage will not
be accepted if it is below the VAC
Dropout setting (150 VAC = VAC
Dropout default setting). Check the incoming AC voltage to the
input of the inverter, ensure it is present
and above the VAC dropout level.
Appliances turn off
and on; or there is
low AC 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 output
voltage is too low or
too high when using
an AC voltmeter. Wrong type of voltmeter used
(will display 170 VAC to 250 VAC
depending on the battery voltage). 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.
While charging, the
DC charge voltage is
higher or lower than
expected. If the Battery Temperature Sensor is
installed, it will increase or decrease
the DC voltage level depending on
temperature around the battery
sensor. This is normal.