Table of Contents
Advertisement
Troubleshooting
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. Use the following chart to help you troubleshoot any issues.
Table 6, Troubleshooting Guide
Symptom
Possible Cause
Low Battery
The battery voltage level has
Voltage
dropped below the Low Battery
(status indicator
Cut Out (LBCO) set-point for
blinks x1/4 secs)
more than one minute
(10.0 VDC = LBCO default).
High Battery
The battery voltage is above 15.5
Voltage
VDC. The inverter automatically
(status indicator
resets and resumes operation
blinks x2/4 secs)
when the battery voltage drops
below 15.5 VDC.
Over-
The internal temperature of
temperature
the inverter has risen above
condition
acceptable limits; caused by
(status indicator
loads too great for the inverter
blinks x3/4 secs)
to operate continuously, or by
lack of ventilation to the inverter.
Once unit cools, it automatically
resets and resumes operation.
AC Overload
The inverter has turned off
(status indicator
because the connected loads are
blinks x4/4 secs)
larger than the inverter's output
capacity, or the output wires are
shorted.
Internal fault
This fault occurs when an internal
(status indicator
fault is detected.
blinks x5/4 secs)
Inverter's status
Inverter is switched OFF, or
light is off
there is no DC voltage (battery)
connected to inverter.
AC input won't
Incoming AC voltage will not be
connect (AC
accepted if it is below the VAC
IN on remote
Dropout setting (80VAC = VAC
blinks)
Dropout default).
Appliances turn
Loose AC output connections.
off and on; or
Loose/corroded battery cables.
there is low AC
output power
Low batteries.
Inverter AC
Wrong type of voltmeter used
output voltage
(displays 90 VAC to 130 VAC
too low or too
depending on the battery
high when using
voltage).
an AC voltmeter
While charging,
If the Battery Temperature
DC charge
Sensor is installed, it will increase
voltage is higher
or decrease the DC voltage
or lower than
level depending on temperature
expected
around the battery sensor.
27
Recommended Solution
Battery voltage too low. Check fuses/
circuit-breakers and cable connections,
and battery voltage at inverter's
terminals. Batteries may need to
be charged—fault condition will
automatically clear when the battery
voltage exceeds 12.5VDC.
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
through the inverter.
Reduce the AC loads connected to the
inverter or remove all AC output wiring,
and then restart the inverter.
To clear, an inverter reset is required.
Remove DC power to the inverter, or
press and hold down the inverter's
power switch for 15 seconds (until
green Status LED lights). 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". 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.
© 2016 Sensata Technologies
Advertisement
Table of Contents
