RoboClaw 2x60A (V6C) Low Logic Battery Error on startup

General discussion of using Roboclaw motor controllers
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Sportech_NOR
Posts: 1
Joined: Tue Feb 25, 2020 7:45 am

RoboClaw 2x60A (V6C) Low Logic Battery Error on startup

Post by Sportech_NOR » Tue Feb 25, 2020 8:00 am

Hello,

I have a -always reccurent- low logic battery error (RED LED blinking 4 times) on the startup of my system that is preventing my two 12DC motors hooked to the Roboclaw to work.
I have tried many thing to dismiss the error and the two only solutions I found that dismiss it are:
1) Plug the USB to my PC, update firmware. (But I have to do it at every startup of my system...)
2) Briefly shortcircuit one of the "+ -" pins under the LB IN.

But both of these solutions are not in adequation with the way we operate our whole system (we can't plug the USB on every startup or shortcircuit it neither).

I have looked around in the forum for some similar cases but I can't really find one.

Could you help me?

Thanks in advance for your time

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Basicmicro Support
Posts: 1592
Joined: Thu Feb 26, 2015 9:45 pm

Re: RoboClaw 2x60A (V6C) Low Logic Battery Error on startup

Post by Basicmicro Support » Fri Feb 28, 2020 11:10 am

When NOT using hte logic battery input, it is possible under some conditions that the Logic Battery input will float. If it floats higher than 3v it can cause a false LB error. The correct fix for this is to short(and leave shorted) the LB+- pins. There is a diode in circuit with the LB+ pin so no power is being shorted when you do this. It just prevents the pin from floating causing false errors.

seurban
Posts: 2
Joined: Tue Nov 03, 2020 8:50 am

Re: RoboClaw 2x60A (V6C) Low Logic Battery Error on startup

Post by seurban » Thu Jun 23, 2022 1:37 pm

Hi, I'm having the same issue but shorting the LB + - pins doesn't work for me. Shorting it doesn't fix the low logic battery error (I have to update firmware each time this happens) and having the short doesn't prevent the error.

Are there any other fixes to try? I don't recall having this error initially, but after not using the roboclaw for a bit it now happens consistently. I can prevent this by hooking a 9V battery to the LB in before I switch this on, which works ok for now while I develop my project but isn't a good solution for after I hand this of to someone to use in the field. I can turn off the 9V battery after it has started up without any issue, it just has to be on at startup.

My Setup:
2x60A (34VDC) Roboclaw
Roboclaw Screw Terminal Adapter (where I tried to short the LB IN using the screw terminals and connect the 9V battery)
24V motor battery
Precharge circuit with a 220 ohm resistor (I hover there for a second or two before switching full power on)

stef308
Posts: 10
Joined: Sat Jul 10, 2021 7:40 am

Re: RoboClaw 2x60A (V6C) Low Logic Battery Error on startup

Post by stef308 » Wed Jul 27, 2022 1:24 am

I have had the same problem with my 2x60A. I have solved it by the following settings for a LiFePo battery 24V (full charged 29.7V and empty 22.5V):

Max Main Battery 34.0V
Min Main Battery 22.5V
Main Battery Offset 0.0V
Max Logic Battery 34.0V
Min Logic Battery 5.5V
Logic Battery Offset 0.0V

You have to write the settings to the Roboclaw for storing them. After that, I disconnect it with the button on IonMotion and reconnect it for checking, if the new settings are stored. If not, repeat it or try to reset your Roboclaw and make all settings the first time you connect it to the computer. This worked for me. Now after some time of use, it works without such problems, but at the beginning I have had also some difficulties to get the settings uploaded!

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