Magnum Energy MS-AEJ Series User Manual

Page 38

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3.4 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 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 fol-

lowing 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 cur-

rent levels. In the event of a short-circuit or overload condition, the inverter will shut down. The

inverter will need to be reset to start operating, refer to section 4.1 for information on resetting the

inverter.
• Over-temperature - If internal power components begin to exceed their safe operating tem-

perature 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 pro-

cessor 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 4.1 for information on resetting the inverter.

MS4024AE

MS4448AE

34.0VDC

68.0VDC

33.2VDC

66.4VDC

25.0VDC

50.0VDC

20.0VDC

40.0VDC

(18.0 - 24.4VDC)*

(36.0 - 48.8VDC)*

17.0VDC

34.0VDC

Model

HBCO

Inverter battery

turn on/off levels

* adjustable with remote control

LBCI

HBCI

LBCO (1 minute

delay)

LBCO (no delay)

Table 3-1, Inverter Battery Turn On/Off Levels

Operation