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Unread 20-11-2012, 15:55
Tom Line's Avatar
Tom Line Tom Line is offline
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Re: New Talon Speed Controller

Quote:
Originally Posted by Ether View Post
Tom, just to be clear what "both cases" means. Are you saying the Victor survived this test:
I can see why that was a little confusing. I suppose I should have been more concise and listed it out in table form.

Test 1:
Talon with no fan.
Driving 2 stalled cims with 4 inputs from the PD board.
Fluke ammeter reporting amperage on the positive battery lead.
Died at 60 amps.
Root Cause: Temps were above 100 C, and the board desoldered.

Test 2:
Victor with fan.
Driving 2 stalled cims with 4 inputs from the PD board.
Fluke ammeter reporting amperage on the positive battery lead.
Ramped up to 80+ amps and the robot began turning off and on.
Ramped back to 80 amps and ran for about 30 seconds without a problem.

Test 3:
Talon with fan driving 2 stalled cims with 4 inputs from PD board.
Fluke ammeter reporting amperage.
Ramped to 80 amps without a problem, held at that point for 30 seconds without a problem.

Test 4: (verification of our fluke ammeter readings)
Talon with 1 stalled cim and 2 inputs from PD board
Inline datalogger ammeter plugged via USB to laptop.
Datalogger was placed on the positive lead from the PD board and fastened to the speed controller.
Ramped to 74 amps without a problem: above this the 40 amp breakers began resetting.

In each case with the fluke, we zeroed it when the robot was enabled with no pwm signal sent to the motor. The robot ran between 3-5 amps on the positive battery lead when enabled with all motors at rest.
 


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