Owner`s manual

Page 43
© 2009 Magnum Energy Inc.
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, then 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 shutdown, 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.
The inverter’s status LED turns off when a low battery fault condition occurs. 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 would
need to be restarted (turned back on) after 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 will
automatically restart after the units cools down.
Internal Fault - The inverter continually monitors several internal components and the
processor communications. If an condition occurs that does not allow proper internal
operation, the inverter will shutdown 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
MS2012 MS2812 MS4024
HBCO 16.8 VDC 16.8 VDC 33.6 VDC
HBCI 16.5 VDC 16.5 VDC 33.6 VDC
LBCI 12.5 VDC 12.5 VDC 25.0 VDC
LBCO*
(1 minute delay)
10.0 VDC
(9.0 - 12.2 VDC)
10.0 VDC
(9.0 - 12.2 VDC)
20.0 VDC
(18.0 - 24.4 VDC)
LBCO (immediate) 8.5 VDC 8.5 VDC 17.0 VDC
*adjustable with remote control
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