Magnum Energy ME-ARC Series Owner's Manual page 62

Operation
• Dead Batt Charge – This fault indicates that the inverter has been connected to an AC
source (grid or generator), and has determined that the battery bank is either highly discharged
or not connected. The inverter is attempting to close its internal relay and to begin charging, but
has detected less than 9 volts (12-volt models), 18 volts (24-volt models), or 36 volts (48-volt
models) on the battery bank.
Remedy: Check the DC voltage at the inverter's DC terminals and compare it with the
DC voltage at the battery bank. These two voltages should be very close (<0.5 VDC
diff erence). If not, check to ensure all connections are tight and the fuse/circuit breaker
between the inverter and battery bank is good.
This fault automatically clears once current fl ows into the battery from the battery
charger—this may take anywhere from a few minutes to a few hours depending on the
condition of your batteries. This fault can also be cleared if the AC input is removed.
• FET Overload – This fault message indicates the inverter/charger was running normally, but
the temperature of the FETs (Field Eff ect Transistors) started rising abnormally fast.
Remedy: Allow the inverter to cool down, then press the remote's INVERTER ON/
OFF pushbutton (manual restart) to resume operation. If the fault returns, perform an
inverter reset (see Section 6.2). If the fault continues, disconnect all the inverter's AC
output wires and perform a power reset (Section 6.3). If this fault does not clear after
doing the power reset, the inverter will require service.
• High Battery – The inverter has turned off because the battery voltage is at a very high level.
This fault message displays and the FAULT (red) LED turns on when the battery voltage is above
the High Battery Cut-Out (HBCO) value. This fault automatically clears and the inverter resumes
operation when the battery voltage drops 0.3 VDC (12v models), 0.6 VDC (24v models), or 1.2
VDC (48v models) below the HBCO value.
Info: The HBCO value is dependent on the inverter version and model. Normally, the
HBCO value for the ME/MM/RD Series' inverters is 16 VDC (12-volt models) or 32 VDC
(24-volt models); and, the HBCO value for the MS/MMS Series' inverters is 17 VDC (12-
volt models), 34 VDC (24-volt models), or 68 VDC (48-volt models).
Info: This fault can occur whether the inverter is "inverting", "searching" or "off ".
Remedy: This fault usually occurs when an external DC charging source is charging the
inverter's battery bank. Turn off any other additional charging source to allow the DC
voltage level to drop.
• High Batt Temp – This fault message indicates the inverter/charger has shut down because
the Battery Temperature Sensor (BTS) has reached a temperature greater than 54°C/129°F.
Remedy: Once the BTS has cooled down (≤49°C/120°F) it automatically restarts and
continues operation. As a precaution, check the area where the BTS is located; if placed
on a battery ensure they are not overheated, or that the BTS hasn't been placed in
a hot area or near a hot device. If neither of these are the issue, then monitor the
Batt Sensor display under the TECH: 01 Temperatures menu—this reading should be
above 54°C/129°F. Now remove the BTS from the inverter BTS port. If the Batt Sensor
reading goes to 25°C/77°F, replace the BTS. If the reading does not go to 25°C/77°F,
then inspect the BTS port for cleanliness and/or have the inverter/charger serviced.
• High Speed Bus – This fault indicates a communication error has occurred between the in-
verter's internal onboard microprocessors. When the unit shuts down because of this fault condi-
tion, perform an inverter reset or power-down the inverter (see Sections 6.2 & 6.3).
Remedy: After performing the reset, turn the inverter on. If the fault does not clear
after the reset, the inverter may require service.
Page 55 © 2021 Magnum Energy, Inc.