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2017 Sensata Technologies
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, it 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.
Info:
High battery voltage may be caused by excessive or unregulated voltage from the
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 shuts down. To start operating after this fault, the inverter needs to 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 units cool 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
ON/OFF Levels
Inverter Model
ME2012
ME2512
ME3112
HBCO
>15.8 VDC
>15.8 VDC
>15.8 VDC
HBCI
15.5 VDC
15.5 VDC
15.5 VDC
LBCI
≥
12.5 VDC
≥
12.5 VDC
≥
12.5 VDC
LBCO
(1-minute delay)
10.0 VDC
*
10.0 VDC
*
10.0 VDC
*
LBCO (immediate)
8.5 VDC
8.5 VDC
8.5 VDC
*
adjustable from 9.0-12.2 VDC with a remote control
