Chief Delphi - pic: Gasp!

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Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- Extra Discussion (http://www.chiefdelphi.com/forums/forumdisplay.php?f=68)

- - pic: Gasp! (http://www.chiefdelphi.com/forums/showthread.php?t=101745)

chmconkling

02-02-2012 20:06

Re: pic: Gasp!

Quote:

Originally Posted by akoscielski3 (Post 1118220)

I'm debating whether your "gasping" about the jaguar used for the motor, or that zip ties are connecting them to the electrical board? Is zip ties legal to use as the connectors for the controller??

we have been using zip ties on ours for years theres a chance of shortage with screws

PAR_WIG1350

02-02-2012 23:43

Re: pic: Gasp!

Quote:

Originally Posted by gpetilli (Post 1118578)

We are doing the same thing. The 393 data sheet calls it a 7.2V motor with 8.5V max so you are correct to be worried about applying 12V. Assuming you use CAN bus, the Jaguar allows you to set a VMax for lower voltage motors. I dont think i would try this using only PWM input to the Jaguar.

No matter what you set the VMax to, the motor will still see full voltage (between 13 and 7 volts depending on state of charge and current draw). VMax pulses the motor to limit the AVERAGE voltage. The maximum voltage actually supplied doesn't change.

JosephC

03-02-2012 00:02

Re: pic: Gasp!

We actually tried running vex motors off a 12v supply during OCCRA, blew them out faster then you can believe.

Also, Par_Wig is correct, even setting VMax to 7v killed the motors

Jeremy Germita

03-02-2012 04:54

Re: pic: Gasp!

A little clarification on the picture...

The main point of the picture is that we(the electrical team) thought it would be somewhat humorous to control a Vex motor with a jaguar. :P

We don't plan on doing anything of this sort, especially after the insight given in this thread. This was merely a little test to see how it would behave.

gpetilli

03-02-2012 08:13

Re: pic: Gasp!

Our breadboard uses two VEX motors, one with the KOP VEX controller tied to a standard PWM output and one tied to a CANJaguar with VMax set to 7V and a 10T Potentiometer for position feedback using the PID (P=250, I=0, D=0) in the Jaguar. Both are working flawlessly. We have not put a scope on the Jaguar output, but we have blown any motors. Your photo is not as crazy as you might think, other than you show using a PWM cable to the Jaguar which may be risky if you command more than +/- 50% percentVolts. Size and weight of the VEX is very attractive for controlling a turret which has a high COG.

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