Troubleshooting; Table 4-1, Basic Troubleshooting - Sensata Magnum Energy MS Series Owner's Manual

4.3

Troubleshooting

The MS Series inverter/charger is a fairly simple device to troubleshoot. The following chart is
designed to help you quickly pinpoint the most common inverter failures.
Symptom
No output power. Inverter is switched OFF
Inverter LED is OFF
Battery voltage is too low. The
battery voltage level has dropped
below the Low Battery Cutout (LBCO)
set-point for more than one minute.
The battery voltage too high. The
inverter automatically resets and
resumes operation when the battery
voltage drops to the HBCI voltage or
lower.
Over-temperature condition: 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.
Once cooled, unit will automatically
reset and resume operation.
AC overload condition: The inverter
has turned off because the connected
loads are larger than the inverter's
output capacity, or the output wires
are shorted.
Internal fault: This fault occurs when
an internal fault is detected.
No output power. Unit is in Search mode, which means
Green LED fl ashing. load is too small for Search mode
Inverter is reset. circuit detection.
Low output or surge Loose or corroded battery cables.
power. Green LED is
Low batteries.
fl ashing.
Loose AC output connections.
Battery cables are the wrong length
or gauge.
Low charging rate Charge rate set too low.
when connected to
Low AC voltage (<90 VAC).
AC power.
Low charging Generator output is too low to power
rate when using a both load and charger.
generator.
Charger does not Loose or corroded battery cables.
charge.
Defective batteries.
Wrong charger settings.
Wrong AC input voltage.
While charging, the If the Battery Temperature Sensor
DC charge voltage is (BTS) is installed, the DC voltage will
higher or lower than increase or decrease depending on
expected. the temperature around the BTS.
© 2016 Sensata Technologies

Table 4-1, Basic Troubleshooting

Possible Cause
Maintenance and Troubleshooting
Recommended Solution
Switch the inverter ON.
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 the LBCI voltage.
This usually only occurs 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-through the inverter (refer to the
ventilation requirements in Section 2.1.3).
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.
Turn on a load greater than 5 watts to bring inverter to
full output power, or turn off Search with remote.
Clean and tighten all cables.
Recharge or replace batteries.
Tighten AC output connections.
Verify recommended cable lengths and gauges from
the manual. Replace cables as necessary.
Adjust charge rate or SHORE settings on remote.
Check AC input wiring.
Reduce the load, increase the generator's RPMs.
Check the SHORE + settings (if remote connected).
Clean and tighten battery cables.
Replace batteries.
Adjust the charger settings, ensure the unit is not in
charger standby.
Verify proper AC input voltage and frequency.
This is normal; see Section 3.5 (Battery Temperature
Sensor Operation) for more information.
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