Problems with parking

VEX V5 Technical Support UNOFFICIAL Tech Support
21

Yes, you should. Use percent of volts. You have to times millivolts by 120

22

Thank you very much! I appreciate the help.

23

The motor power error message means the V5 limited motor current to keep the total battery current within allowable limits, that happens if you are using more than 16A for 1 second, which usually means you are stalling lots of motors.

The battery low cell 1 voltage error means that you potentially have a battery that has a failing cell or is almost discharged, if that error just happens occasionally, then it’s probably ok, but if it keeps happening, and the battery is fully charged, the battery may be near the end of its life.

24

Here is sample code

Screenshot_20220430-175021_GitHub
Screenshot_20220430-175021_GitHub1662×620 120 KB

25 
double l=Chesseburger1.Axis3.value()*1;
     
double p=Chesseburger1.Axis1.value()*1;


    l1.spin(directionType::fwd,(l + p),voltageUnits::mV);
    l2.spin(directionType::fwd,(l + p),voltageUnits::mV);
    l3.spin(directionType::fwd,(l + p),voltageUnits::mV);
    l4.spin(directionType::fwd,(l + p),voltageUnits::mV);
    r1.spin(directionType::fwd,(l + p),voltageUnits::mV);
    r3.spin(directionType::fwd,(l + p),voltageUnits::mV);
    r2.spin(directionType::fwd,(l + p),voltageUnits::mV);
    r4.spin(directionType::fwd,(l + p),voltageUnits::mV);

would this work?

26

it said that once.

…

27

so I’m not sure which message you saw only once, but if the motor power error message keeps showing you may have a combination of low battery voltage (ie. lower than nominal 12.8V) and slightly power hungry motors.

Usually max motor current is 2.5A, but that does not mean 2.5A is being pulled from the battery as the motor is working at a lower voltage when stalled to be able to limit current to that value. A rough estimate is 1.6A pulled from battery when the motor is stalled and pulling 2.5A. Even with 8 motors you would normally never see the motor power message, but if something is causing more current to be used from the battery (and a lower battery voltage can cause that) and you trip the current limit, your motor current will be drastically reduced, I think we drop to 1A at the motor until the error is cleared.

28

You would need to multiply the values by 120

29

It still doesn’t work.

30

We changed the drive to 450 rpm and now it can park with six mogos

31

bruh, six mogos??? That is dope. Any videos?

32

I’ll post one.
20char

33

only 5

34

My old robot had 6 motor 200rpm direct and it could park with 5 too.