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4.3
Troubleshooting
The MS-G 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
N o o u t p u t p o w e r.
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 is 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. When the
unit has cooled, it 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.
N o o u t p u t p o w e r.
Unit is in Search mode, which means
Green LED is fl ashing.
the load is too small for Search mode
Inverter in 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.
L o w c h a r g i n g ra t e
Charge rate set too low.
when connected to AC
Low AC voltage (< 90 VAC).
power.
Low charging rate when
Generator output is too low to power
using a generator.
both load and charger.
C h a r g e r d o e s n o t
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 the
expected.
temperature around the BTS.
© 2015 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 condition 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-thru 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.
An inverter reset is required to clear fault. Remove
DC power to the inverter, or press and hold down the
inverter's power switch for ~10 seconds (until green
Status LED lights). If fault does not clear, the unit needs
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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Table of Contents
Troubleshooting
