Electrical Quick release after motor controller?

[mkaa00x]

Okay hey guys, so I have this question.
Is it legal to have a quick release after the motor controller, but before a motor so that you could separate/sever the electrical connection quickly. The same quick release used to connect the circuit breaker and the PD Board to the battery.

Something like this:
http://www.ceautoelectricsupply.com/vhcconnectors.html

[AllenGregoryIV]

Many teams use Anderson connectors for this all time. 45/30 amp powerpoles work well and are much smaller and designed for 10/12 awg wire unlike most connectors for the large anderson connectors that we use on the batteries.

Powerwerx and Allied Electronics both carry them along with a host of other vendors.

[jbsmithtx]

According to current rules, yes you can, but there could be a reason as to why they may change this in the future...

R49
Branch circuits may include intermediate elements such as COTS connectors, splices, COTS flexible/rolling/sliding contacts, and COTS slip rings, as long as the entire electrical pathway is via appropriately gauged/rated elements.

[orangemoore]

My team did have quick disconnects this year. The only problem we had was that sometimes they would wiggle themselves out just enough to not work. It wasn't a huge deal but it was just an extra thing to think about before every match.

[AllenGregoryIV]

Originally Posted by orangemoore

My team did have quick disconnects this year. The only problem we had was that sometimes they would wiggle themselves out just enough to not work. It wasn't a huge deal but it was just an extra thing to think about before every match.

Zip ties, or if you want to get fancy they sell clips to prevent this.

[Al Skierkiewicz]

Some type of connector is recommended to allow fast replacement of damaged or defective sub-assemblies. As pointed out the Anderson 30 and 45 amp connectors are one of the best ways to do this. However, a simple design where the speed controller is mounted near the motor works well. Quick connects on the controller itself, allow shorter motor wiring and less opportunity for failures. We use 1/4" spade connectors on the controllers and Andersons if we can't position the controller and motor close to each other.

[nathan_hui]

CHS Robotics used (pretty sure we still are) the Molex .093" series wire to wire connectors for interconnects between the PDB and the Motor Controller, and the Motor Controller and the Motor. These were only for the lower amperage circuits (20 amp max on a connect specc'd for 15 amps). We used a set of Anderson PowerPoles with a 30 amp rating for the 40 amp circuits (but we had some problems with failure of the solder joints. Possibly consider getting the actual crimper for the 45 amp contacts, or switching to a different connector, possibly a Molex).

At university, we use the XT90/60 and Deans T-connectors for high amperage circuits (75+ amps). The nice thing about these connectors is that they are actually fairly small, do not tend to come out easily, and very robust. Bad thing is they can't be panel mounted. Also, the Deans connectors are not the safest of connectors (unshrouded male pins).

One thing you should do is design your system to be modular and, well, idiot-proof. If you package your entire control system (cRIO, breakouts/headers, and PDB) and place modular interconnects between everything (use wire-to-wire connects for power, and 0.1" headers to DB9/15/25), you have made a system very open to prototyping (just plug and play, quite literally), and setting up your system for competition is fairly simple. If you standardize your connectors to the type of circuit, i.e. a particular connector for 20A circuits, a particular connector for 10A circuits, a particular connector for 40A circuits, and a particular connector for 5V circuits (this one is key!!!), and you do this between the controller and power, then essentially an idiot (i.e. a rookie) could wire up your robot for you.

[saikiranra]

We always use Anderson Power Poles in the wire that connects a motor controller to a motor. They are reliable and fairly easy to crimp. This season, we also got the clips to go along with them, and they worked like a charm. In the past we have used zip ties too, however.

[Jon Stratis]

Originally Posted by nathan_hui

CHS Robotics used (pretty sure we still are) the Molex .093" series wire to wire connectors for interconnects between the PDB and the Motor Controller, and the Motor Controller and the Motor. These were only for the lower amperage circuits (20 amp max on a connect specc'd for 15 amps). We used a set of Anderson PowerPoles with a 30 amp rating for the 40 amp circuits (but we had some problems with failure of the solder joints. Possibly consider getting the actual crimper for the 45 amp contacts, or switching to a different connector, possibly a Molex).

You should double check what you're using... All connectors must be "appropriately gauged/rated", per R49, previously quoted. To me, that says that if you have a 20A breaker on a given line, any connectors in line with that breaker also need to be rated for a minimum of 20A. For 30A breakers, they should be rated for 30A or above, and for 40A breakers for 40A or above. With what you've suggested above, you are using connectors that are rated less than the breakers - as I read it, that violates the rules.

The crimper for the PowerPoles works really well, and i highly recommend it, although its not necessarily required. For the open PP connectors (shaped like a U), you can bend the tabs over carefully with a pair of pliers. Even with the crimper, though, I recommend everyone solder the terminals as well. So long as it is properly soldered, it'll never be coming apart. The key is to solder it properly... with people new to soldering, its very easy to get a cold solder joint and thus a weak connection that'll break off easily.

[caseybarisax14]

Yes you came your team used them for all of your motor controllers

[tim-tim]

Amazon is a good source for a lot of things, especially Amazon Supply(formerly known as Small Parts).

Here is the 100 pack we ordered a few weeks back. They also have smaller packs, 50 and 10.

I have seen other teams use different colors for each motor and motor controller for quick visible recognition of where the connections go.

[mkaa00x]

Thanks once again! Okay so I've talked to my team's electronics guy and he'll be checking over this. Once again GOOD LUCK TO ALL TEAMS AND THANKS FOR THE HELP ^_^

[Foster]

Ham radio operator and a boater here: I've been using Power Poles for years and I love them. Spend the money and buy the crimp tool. The crimp puts even mechanical pressure on the wire, and creates wire/crimp areas that are pressure tight. Even mechanical pressure means the crimp will not come off in abnormal use. Pressure tight means no corrosion at that point (Corrosion is bad on a boat).

They come in colors and the right sizes for the job. They give you the ability to do both "correct wire colors" and allow for final decision at the device. Case in point, swerve drives have two motors close to each other. The wires coming to them are black/red indicating power. But the Power poles are Black and Red and Black and Yellow, and they mate to the same colors on the motors. (Drive and steer)

On the boat I have lots of pairs of items. Port side gets black/red starboard side gets black / orange.

[evanperryg]

Originally Posted by orangemoore

My team did have quick disconnects this year. The only problem we had was that sometimes they would wiggle themselves out just enough to not work. It wasn't a huge deal but it was just an extra thing to think about before every match.

We use the Anderson Powerpole connectors. If you do them right, they shouldn't come apart. However, we wrap tape around ours just to be safe.

Originally Posted by Al Skierkiewicz

Some type of connector is recommended to allow fast replacement of damaged or defective sub-assemblies. As pointed out the Anderson 30 and 45 amp connectors are one of the best ways to do this. However, a simple design where the speed controller is mounted near the motor works well. Quick connects on the controller itself, allow shorter motor wiring and less opportunity for failures. We use 1/4" spade connectors on the controllers and Andersons if we can't position the controller and motor close to each other.

If you were to put motor controllers that far out, wouldn't you have to make your PWM cables really long, too? We try to keep all of our wires short to minimize resistance/emf interference.

[tim-tim]

We use this crimper and have not had any issues.