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TROUBLESHOOTING GUIDELINE
Table 9: Troubleshooting guideline
Issue Suggested Action
The BM500-BT doesn't operate
(The Status LED does not flash)
Current readout gives wrong
polarity (current should be
positive when charging and
negative when discharging
the battery)
The monitor doesn't operate
(no display)
• Check the ’B-’ and battery side connections
• Check battery voltage. Battery might be flat. The B1+
voltage must be above 7V DC for the shunt to system
to detect the battery
• Try restarting the monitor by removing and
reconnecting the supply wire to the ’B+’
Display returns ’---’ in Time
to go readout and the state
of charge (SoC) bar is
flashing.
"State of Charge” and/or
"Time to go" not accurate
The monitor resets all
the time
The monitor does not
automatically synchronize
• Make sure that the battery is not charging or
discharging when you restart the BM500-BT device
• Check the connection between the shunt and the monitor
• Check the wiring for corrosion and / or loose contacts
• Connected battery might be flat or defective
• Shunt installed in reverse. Make sure that the ’B-’ is
connected to the battery negative terminal and the
’S-’ bolt to the battery loads
• The battery is not reaching its fully charged state.
Check if the charge algorithm matches the
requirements of the connected battery.
Do not interrupt the charge process before it is finished.
• Check if all current is flowing through the ’B-’ of the
shunt (the negative terminal of the battery should only
contain the wire going to the ’B-’ side of the shunt)
• Shunt installed in reverse. Make sure that the ’B-’ terminal
is connected to the battery negative terminal and the
’S-’ terminal to the battery loads
• Check if all battery properties (F01 and F02) are
correctly set
• Check if the battery monitor is synced with
battery. Perform full charge cycle
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