Working around a persistent Logic Battery Low error
-
Basicmicro Support
- Posts: 1594
- Joined: Thu Feb 26, 2015 9:45 pm
Re: Working around a persistent Logic Battery Low error
You are correct. A low logic battery error is latched and will not clear unless the unit is power cycled. This is to prevent the controller from doing something that may damage the board if the logic power falls too low. The assumption is if logic power drops below the limit the battery is discharged abd should not be operated until it is recharged.
Assuming you dont want to use a seperate logic battery, the proper work around is to set the main battery minimum voltage to a high enough point that the logic battery low voltage error will not trip. This will prevent load from the motor from pulling the main battery below the logic battery thershold when under load and will prevent the motors from operating if the battery drops to this level from discharge, then the unit will be able to recharge from the solar panels while still having enough power to run the logic safely. Im assuming the drone will always be operated in the sun with this option.
The newer units will automatically use either LB or MB power depending which is higher at any given moment. So if your main battery voltage drops too low the logic battery voltage will power the logic seemlessly(if it has a separate battery installed). As long as the LB+- is at least 5.5v(or whatever you set the logic battery minimum voltage to) you will not get a low logic power error. Note that LB+- only operates the logic circuit so very little power is ever drawn from it, which means you can use a fairly small battery for logic power.
Assuming you dont want to use a seperate logic battery, the proper work around is to set the main battery minimum voltage to a high enough point that the logic battery low voltage error will not trip. This will prevent load from the motor from pulling the main battery below the logic battery thershold when under load and will prevent the motors from operating if the battery drops to this level from discharge, then the unit will be able to recharge from the solar panels while still having enough power to run the logic safely. Im assuming the drone will always be operated in the sun with this option.
The newer units will automatically use either LB or MB power depending which is higher at any given moment. So if your main battery voltage drops too low the logic battery voltage will power the logic seemlessly(if it has a separate battery installed). As long as the LB+- is at least 5.5v(or whatever you set the logic battery minimum voltage to) you will not get a low logic power error. Note that LB+- only operates the logic circuit so very little power is ever drawn from it, which means you can use a fairly small battery for logic power.
-
Basicmicro Support
- Posts: 1594
- Joined: Thu Feb 26, 2015 9:45 pm
Re: Working around a persistent Logic Battery Low error
Also to be clear on your problem, the LBLO threshold by default is 5.5v on our 34v controllers(on HV controllers it is 10v). This means you should not be seeing the LBLO at or above 9v unless you changed the logic battery low setting. Make sure you have this set to 5.5 and main battery low is set higher. My guess is your motors cause the main battery to drop low enough under load at some point that causes a LBLO even though the average battery voltage is still above 9v.