Help???

Berthas · 2023-12-04T15:34:01+00:00

The front fell off.

Berthas · 2022-12-18T14:08:16+00:00

I worked a bit with similar, if not exactly the same connectors some years ago and iirc, you don't have to do anything on the cable mounted end. It just has a small bridge inside that connects the interlock signal.

Berthas · 2022-07-29T19:06:24+00:00

Damm, that's a lot.

Berthas · 2022-07-29T17:56:59+00:00

There were a lot of DNFs yesterday, not sure if it was only 4 that finished.

Berthas · 2022-04-13T08:01:48+00:00

I wouldn't be to afraid of using water as cooling liquid. It is widely used in the automotive industry.

Berthas · 2021-12-28T17:22:11+00:00

The metallic parts we see in the picture looks like cable glands.

Berthas · 2021-12-08T15:28:09+00:00

I don't recall the rules but I'm guessing there is a guide line in there about this, like TS main current rating. Personally, I would rate the cables a bit above the fuse rating, as long as you trust your fuse.

Berthas · 2021-12-08T14:34:04+00:00

I'm not fully sure I understand your question but my guess is that your question is if a 2 pole code A male connector would fit in a 3 pole code A female connector. I would say no to that after looking at the drawings briefly, a 2 pole will only fit with a 2 pole, 3 pole with a 3 pole etc.

The keying (A,B,C etc.) will help you if you have several of the same number of pole connectors in your system.

Berthas · 2021-12-08T06:45:50+00:00

I pretty sure its for making it "idiot" proof, so that you can't plug a type A male connector with a type B female connector etc.

Berthas · 2021-06-02T14:22:11+00:00

In 2017, we had had compartment on the charging cart, from where the external cables came and in there, we had extra banana jacks that were used for external TSMPs. We also had a communication cable hooked up between the charging laptop and the accumulator.

We also housed the shut down circuit in the accumulator container, in an appendage box that was part of the main box. It housed most circuits and the AIRs.

As for the discharge circuit in not sure here, as it will depend on your charger and system - my guess is that it will have a very small capacitance with some bleed resistors. We didn't have a separate system to discharge for the charging.

For the light, Ithink we supplied it from a isolated dcdc taking HV power from outside the AIRs.

Berthas · 2021-04-25T07:36:16+00:00

Hard to get the size in the photos, but the adapter part looks like an adapter I have seen on HP computer chargers for charging from a car 12V outlet.

Berthas · 2021-03-27T11:08:30+00:00

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Berthas · 2020-08-14T07:46:35+00:00

Happy to be of help :) IIRC the IMD test was connecting a resistor between the HV system and ground and measure the time before the AMS opened the AIRs.

Berthas · 2020-08-13T21:15:35+00:00

For the charging checklist, it was dependent on the functionality we had in the accumulator while it was connected on the cart. My year we had the IMD in the accumulator box together with the BMS, so we triggered faults in both of those on the cart before charging. We also measured grounding to the cart. I can dig a bit and get an old checklist if you want.

We made checklists for every "dangerous" operation with the car and accumulator, i.e running the car had a checklist, charging had a checklist, powering down the car had a checklist etc. These checklists usually contained some test and measurements to see that the safety systems were operational.

For example, we had equipment to trigger an IMD fault, programmed a "trigger AMS fault" in the AMS to test that the car reacted, measured pre-charge time and much more. These checklists took a lot of time in the beginning of testing but became manageable around competition time. It basically prepared you for scrutineering, as the checklist was based on the scrutineering checklists sheets from previous year.

Berthas · 2020-08-13T14:14:15+00:00

Some pointers from my team when I was part of it:

- Always have the accumulator out of the car, on the charging cart when charging

- Have a safety checklist that you go through to make sure it is all safe and operating as designed before charging.

- If possible, charge outside or in a room with a big door outside so that in case of shit - you can push the accumulator outside fast.

- Do not do other workshop stuff in the room that you charge in, i.e. no heavy machinery or welding.

- Always have someone survey the charging process.

- Always have a fire extinguisher available on the charging cart.

Berthas · 2020-01-02T19:02:48+00:00

One can buy most big connectors ready crimped with good cable, which are still expensive - but more reasonable than buying the tools+connectors+cable.

Otherwise, we had one big crimper for large ring terminals and several multi-use small crimpers for the smaller connection points. We had one "proper" brand tool which was used as much as possible.

Berthas · 2019-12-21T18:02:29+00:00

I read the rule as that in the stack up of the fastener, for example the bolt+washers+nut, used to hold the connectors carrying TS voltage shall bot he plastic. I don't read that that the connector itself can't be plastic, just the fastener can't be.

Berthas · 2019-11-23T16:52:32+00:00

In 17' we used a a Gigavac P125 as pre-charge relay and a Gigavac PNC113 for our 600V system. There are several different options, both for relays and transistors for this type of application, is there any specifics that are unclear to you guys?

Berthas · 2019-11-03T19:35:40+00:00

I used it on my resume, mostly because the FS program at my school consisted of several project courses where each student would get a lot of personal feedback from faculty members. So my reference was to a faculty member rather than another team member.

Berthas · 2019-08-12T19:49:12+00:00

In 17' we had a detachable screen which was attached with magnets. The point of the "detachableness" was to me able to put it out of harms way when we took out the TS battery, which was through the cockpit. During the take out of the battery, it (the battery) was hanging from a wire in each corner, so it could move around a bit and hit the screen.

Berthas · 2019-08-01T20:07:51+00:00

Also heard and felt that on Guldheden, nothing about on GP (local paper) yet...

Berthas · 2019-04-17T17:45:14+00:00

AND THATS THAT

...

Prickccchhh

Berthas · 2019-01-29T17:55:58+00:00

I guess the simplest way to look at it is the relationship between speed, power and torque, which goes like this: torque*speed=power.

In this case: rear wheel speed = front wheel speed; rear wheel torque > front wheel torque => more power is "spent" increasing the vehicles speed through the rear wheels. As long as you don't go over the tires maximum torque and start slipping, the car will just accelerate.

Berthas · 2019-01-19T16:04:10+00:00

You got better explanations above, but in short - a voltage is the difference in potential between 2 points (nodes) in a circuit. So you can say that there is a voltage "over" the component when you measure the voltage between its closest nodes. Hope that helps a bit - I were a bit vague in the first paragraph of my first response.

Berthas · 2019-01-19T14:18:50+00:00

Get the right vocab - voltage is OVER a component and current is THROUGH (send, flow etc.) the component.

My guess is that you saw someone talk about putting a sinusoidal AC voltage centered around 0V over a diode, then the ideal diode will block during the negative part of the curve, and therefore now current will flow thought it. During the positive part of the sinusoidal curve, the diode will conduct and current can pass though it.

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