Talon sr, or SRX?

[E Dawg]

We're using five SRX's. The SR's were pretty good, but the SRX's blow them out of the water.

[FrankJ]

Originally Posted by E Dawg

We're using five SRX's. The SR's were pretty good, but the SRX's blow them out of the water.

How so? Assume you are using PWM & no limit switches so you are comparing apples to apples.

Now if you are comparing Talon SRXs to Jag...

[Mschmeh144]

the talon srx has a closed casing, but so does the sr. the thing I don't like about the talon srx is the wires that come pre-attached. if you cut them or strip them you cannot make a mistake, or you've got yourself a useless talon. even the CAN wires come preattached, in the model that has them at least, im not sure if there is a PWM model.

also, its perfectly okay to have them plugged into the pdp and running on robot startup, but not connected to the motors?

[GeeTwo]

Originally Posted by Mschmeh144

also, its perfectly okay to have them plugged into the pdp and running on robot startup, but not connected to the motors?

Sure. It's a custom circuit consisting of a very high-value resistor.

[Dunngeon]

Originally Posted by Mschmeh144

the talon srx has a closed casing, but so does the sr. the thing I don't like about the talon srx is the wires that come pre-attached. if you cut them or strip them you cannot make a mistake, or you've got yourself a useless talon. even the CAN wires come preattached, in the model that has them at least, im not sure if there is a PWM model.

also, its perfectly okay to have them plugged into the pdp and running on robot startup, but not connected to the motors?

There's quite a bit of wire on the SRX controller, it would take a large quantity of screw-ups to shorten the wire to the point where the SRX becomes unusable. If anything, the integrated wires are a plus because the electronics are physically isolated from the outside environment.

[Mschmeh144]

Originally Posted by Dunngeon

There's quite a bit of wire on the SRX controller, it would take a large quantity of screw-ups to shorten the wire to the point where the SRX becomes unusable. If anything, the integrated wires are a plus because the electronics are physically isolated from the outside environment.

This is true. But, accidents do happen. Especially with our testebed, which unexperienced members use like a toy.

[JesseK]

For critical components, we're also late adopters. 8 SR's on our bot (1 spare).

[GeeTwo]

Originally Posted by MrForbes

We're late adopters. Six of the SR on our robot.

Same here.

Originally Posted by Alan Anderson

There's no problem in having a speed controller present and powered but with no motor connected.

Good thing. We only have five motors (3 H-drive, 2 on lift). The sixth has leads with Anderson connectors on the end. We started laying out the board before we knew what we needed, and while we took the PCB off, we left the unused talons and spikes as spares. (We're using the spikes for lighting).

[Pretzel]

We made a large investment in 24 Talon SRX's, as our design requires twelve and we're building a practice bot on top of the competition ones. So far, we've been VERY happy with them compared to the Jags we used previously.

[Mschmeh144]

Originally Posted by Pretzel

We made a large investment in 24 Talon SRX's, as our design requires twelve and we're building a practice bot on top of the competition ones. So far, we've been VERY happy with them compared to the Jags we used previously.

We found it easy to just buy a ton of them too, but we didn't buy enough to have a spare for every one that we actually use. I am impressed with their closed casing, and the way they are generally built allows them to be packed tightly into small spaces. Otherwise, we would be using talon SR controllers instead. They are definitley a improvement over the Jags, but only time will tell how much of a improvement.

[E Dawg]

Originally Posted by FrankJ

How so? Assume you are using PWM & no limit switches so you are comparing apples to apples.

Now if you are comparing Talon SRXs to Jag...

Talon SRX's use CAN, so we can get real-time data on the WebDashboard; they have passive heatsinking; they are microcontrollers, so the PID loop that controls them is offloaded; and it's almost impossible to get metal shavings in them.

Also CAN wiring is a lot better than PWM wiring.

[jojoguy10]

Late adopters here as well. 5 Sr's on ours.

[Bruceb]

some sr's and some VIC 888s and 884's

[ILAMtitan]

We have 9 SRXs on our bot this year. No complaints yet except our software team commented on some wonky embeded PID loop software, but they got it working.

All nine are on CAN. We crimped PWM cable headers to each end, one male and one female so that the chain has a single direction that can't be messed up. A small ziptie where the middle wire is missing keeps em together.

We also have sensor input directly into three of them (limits and an analog absolute encoder). Using a few free 10pin cables from Samtec we just made some custom adapters depending on what the sensor is. All in all, we're very happy.

[Ether]

Originally Posted by ILAMtitan

No complaints yet except our software team commented on some wonky embeded PID loop software, but they got it working.

I don't think that's a fair characterization.

The PIDF in the SRX is meticulously documented in the SRX Software Reference Manual, and many teams have commented on how well it works. CTRE's chief software engineer Omar Zrien monitors these forums and stands ready to personally help any team having problems.