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©
2013 Magnum Energy, Inc
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Operation
3.6 Protection Circuitry Operation
The inverter is protected against fault conditions and in normal usage it will be rare to see any.
However, if a condition occurs that is outside the inverter’s normal operating parameters, it will
shut down and attempt to protect itself, the battery bank, and your AC loads. If there is a condition
that causes the inverter to shut down, it may be one of the following conditions [also refer to the
Troubleshooting section (Section 4.3) to help diagnose and clear the fault condition].
• Low
Battery
– The inverter will shut off whenever the battery voltage falls to the
LBCO
(Low
Battery Cut Out) level to protect the batteries from being over-discharged. After the inverter
has reached the LBCO level and turned off, the inverter will automatically restart after one of
the following conditions:
1. AC power is applied and the inverter begins operating as a battery charger.
2. Battery voltage rises to the
LBCI
(Low Battery Cut In) level.
Refer to Table 3-1 to determine the LBCO and LBCI levels for your inverter model.
• High
Battery
– In the event the battery voltage approaches the
HBCO
(High Battery Cut
Out) level, the inverter will automatically shut down to prevent the inverter from supplying
unregulated AC output voltage. The inverter’s status LED turns off when a high battery fault
condition occurs. The inverter will automatically restart when the battery falls to the
HBCI
(High Battery Cut In) level. Refer to Table 3-1 to determine the HBCO and HBCI levels for
your inverter model.
Info:
High battery voltage may be caused by excessive or unregulated voltage from
the solar panels or other external charging sources.
• Overload
– During inverter and standby operation, the inverter monitors the DC and AC
current levels. In the event of a short-circuit or an overload condition for more than a few
seconds, the inverter will shut down. To start operating after this fault, the inverter must be
restarted (turned back on) once the inverter’s AC loads are reduced/removed.
• Over-temperature
–
If internal power components begin to exceed their safe operating
temperature level, the inverter will shut down to protect itself from damage. The inverter’s
status LED turns off to indicate the over-temperature fault condition. The inverter automatically
restarts after the unit cools down.
• Internal
Fault
– The inverter continually monitors several internal components and the
processor communications. If a condition occurs that does not allow proper internal operation,
the inverter will shut down to protect itself and the connected loads. The inverter will need
to be reset to start operating—refer to Section 4.4 for information on resetting the inverter.
Table 3-1, Inverter Battery Turn On/Off Levels
Inverter Battery
Turn ON/OFF Levels
Inverter Model
MSH3012M
MSH4024M
HBCO
>16.8 VDC
>33.8 VDC
HBCI
16.5 VDC
33.2 VDC
LBCI
12.5 VDC
25.0 VDC
LBCO*
(1 minute delay)
10.0 VDC
(9.0 – 12.2 VDC)
20.0 VDC
(18.0 – 24.4 VDC)
LBCO (immediate)
8.5 VDC
17.0 VDC
*adjustable with remote control
