Protection Circuitry Operation; Table 3-1, Inverter Battery Turn On/Off Levels - Sensata Magnum Energy MS Series Owner's Manual

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 shuts 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 turns off , the inverter automatically restarts after one of the
following conditions are met:
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 automatically shuts down to prevent it from supplying unregulated AC output
voltage. The inverter's status LED turns off when a high battery fault condition occurs. The
inverter automatically restarts 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 shuts 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 shuts down to protect itself and the connected loads. The inverter needs 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
MS2000/
ON/OFF
MS2012
Levels
HBCO >16.9 VDC
HBCI 16.6 VDC
LBCI 12.5 VDC
LBCO* 10.0 VDC
(1 min. delay) (9–12.2 VDC)
LBCO
8.5 VDC
(immediate)
Page 51
Inverter Model
MS2812 MS2024
>16.9 VDC >33.8 VDC
16.6 VDC 33.2 VDC
12.5 VDC 25.0 VDC
10.0 VDC 20.0 VDC
(9–12.2 VDC) (18–24.4 VDC)
8.5 VDC 17.0 VDC
*adjustable with remote control
MS4024
>33.8 VDC >67.6 VDC
33.2 VDC
25.0 VDC
20.0 VDC
(18–24.4 VDC) (36–48.8 VDC)
17.0 VDC
© 2016 Sensata Technologies
MS4048
66.7 VDC
50.0 VDC
40.0 VDC
34.0 VDC