Victor Brake/Coast Default

[FRC4ME]

Our team has always run the Victors without the brake/coast jumper installed due to a line in the pre-2005 IFI manual that says "If no jumper is installed, the speed controller will default to a Brake condition."

We just discovered, however, that that line was removed from the manual after a 2005 revision. Can anyone confirm that the Victors still default to brake if no jumper is installed?

[RyanN]

I cannot confirm if they changed anything, but if the user manual says to do it, I would do it.

Last year, and the year before, I just removed the jumpers because that is what I remembered doing in 2005, but this year while reading the user manual, I found that it said specifically to not run without a jumper installed, so I think we left the jumpers on, and set to brake.

If I remember correctly, in 2005, if you would put the jumper on brake, it would only brake it in one direction, if you removed it, it would brake it in the other direction, but I cannot confirm this.

[Jetweb]

according to the picture at the top it looks like open (no jumper) is coast mode.

http://www.ifirobotics.com/docs/ifi-...al-9-25-06.pdf

[FRC4ME]

We are going to go ahead and install the jumpers anyway since the manual now says to always install them, but we are wondering if it is going to make any difference.

according to the picture at the top it looks like open (no jumper) is coast mode.

Why do you say that? It looks to me like the picture is simply showing the jumper in the coast position.

[TubaMorg]

Here are the lines to look at from the Victor manual:

Brake / Coast Guidelines:
1. Always install jumper to prevent loss. If you lose
the jumper, a standard computer jumper will work.
2. The Coast condition (Jumper on Inner two Pins) sets
the output to an open circuit during neutral.
3. The Brake condition (Jumper on Outer two pins)
sets the output to a short across the motor leads
during neutral.

If the jumper is missing, that is an open condition which means "Coast"
Note #1. It just says to install the jumper to "prevent loss" There is no functional reason to do so if you desire a coast configuration.

[Jetweb]

Why do you say that? It looks to me like the picture is simply showing the jumper in the coast position.

If you look closely there is a + on the only visible brake/coast pin. and I remember that the center is signal and that makes the other pin ground so in coast mode the circuit open and brake mode is closed. So no jumper = coast mode.


My team is actually controlling the brake coast with a Digital IO cable so we have played with it a little.

[Al Skierkiewicz]

Dan et al,
The manual goes on to say...
"The speed controller checks the status of the jumper
approximately 60 times per second. This allows the user
to change from brake to coast during operation."

[copperhead47]

in past years the victors didnt have any marking on the brake coast jumpers but the newer ones do. now, i dont know if thats just the product of a new design revision or they did that on the reasoning that "b" would be brake and "c" would be coast so that you knew which ones is which. so for safety i would go by the markings and leave the jumper in whichever one you want. If the victor doesnt have b or c on it? compare it with a vic. that does. thats all i got- im out