Possible bad Jaguar.... Thoughts?

[Bot190]

Going along with the over current thing, The jaguars will hold 60Amps for 2 seconds, its possible that you are exceeding the current limit on the jaguars and they are shutting off. If that is the case, then they should start responding to inputs, and the LED should stop blinking after 3 seconds.

[PhilBot]

I wondered what the hold time was.
The fault is occuring well before 2 seconds elapses.

eg: I'll be driving along at 50% power (very low load) and then do a snap reversal. The left motor cuts out immediately, causing the robot to spin, rather than reversing.

Hmmm.

The LED does stop blinking after about 3 seconds, but that doesn't indicate the specific cause as a current limit.

Originally Posted by Bot190

Going along with the over current thing, The jaguars will hold 60Amps for 2 seconds, its possible that you are exceeding the current limit on the jaguars and they are shutting off. If that is the case, then they should start responding to inputs, and the LED should stop blinking after 3 seconds.

[dyanoshak]

Originally Posted by PhilBot

I don't suppose the current limit is configurable (and mine got set too low).

The current limit is not configurable, but the fault shut-off time is. You can set the fault shutoff time as low as 500 ms.

I am not familiar with the proper WPI Library calls to set this parameter, maybe someone else can comment.

Originally Posted by PhilBot

The fault is occuring well before 2 seconds elapses.

The over current protection uses a timer to count how long the Jaguar is operating above the limit. This timer follows an exponential equation that intersects at 60A and 2 seconds. Above 60A the Jaguar will shut off at exponentially smaller time periods. For >100A the time until shutoff is quite short.

-David

[lucoytoa]

Originally Posted by dyanoshak

The current limit is not configurable, but the fault shut-off time is. You can set the fault shutoff time as low as 500 ms.

I am not familiar with the proper WPI Library calls to set this parameter, maybe someone else can comment.



The over current protection uses a timer to count how long the Jaguar is operating above the limit. This timer follows an exponential equation that intersects at 60A and 2 seconds. Above 60A the Jaguar will shut off at exponentially smaller time periods. For >100A the time until shutoff is quite short.

-David

We're experiencing this same problem. Where in Labview can we change this?

[kamocat]

Originally Posted by lucoytoa

We're experiencing this same problem. Where in Labview can we change this?

This is a CAN-only feature.
You can adjust it with the "config fault time" function in Actuators > Motors > CAN.

[hydrocannon]

bad jaguars we lost three out of four in the last few days and last night we realized the crio was recieving twice has much power has it suposed too could are jaguars been because they were recieving to much power?

[Al Skierkiewicz]

hydro,
There is no way for you to supply twice as much power to the Crio. It should be connected to the +24 volt output connector on the PD. This is the highest voltage on the robot. Everything else is either 12 volts or below. The Jaguars receive no power from the Crio.