[HELP] Receivers v2

[Bony_em]

 

In the official lego v2 receiver how many engines can be put? 4,5 or 6? Is that the Sbrick e seen that you can put 5 at least what is seen, but sbrick I do not have, what I have are 2 receivers v2.

[ColletArrow]

Do you mean how many individual outputs each has, or how many motors each can power successfully? One V2 receiver has 2 outputs, and the Sbricks have 4. I don't know how many motors could be powered from each output however. What are you trying to build?

I also recommend getting a moderator (perhaps @Jim?) to move this to the Technic forum, you'll get a much more comprehensive answer from people who really know what they're talking about over there.

[Bony_em]

 

I'm talking about how many engines the v2 receiver supports.

 

I'm riding an 8x8

Edited June 17, 2017 by Bony_em

[zux]

Depends how many motors you want to run simultaneously. And the type of motors is important as well.

Which motors are you using in your 8x8? Zblj's Fox 8x8x8 use 4x v2 Receivers to drive 8 XL motors. Plus additional receiver just for steering.

[brunojj1]

You seem to be new to the matter, so first of all I´d like to welcome you to this interesting subject! I can understand that you don´t like to experiment too much and buy lots of all sort of PF equipment, especially the rare and expensive V2 receivers.

There have been several topics on here about this sort of question:

 

You could study Philo´s homepage as well about the main characteristics and differences between V1/V2 and motors:

http://www.philohome.com/pfrec/pfcurves.htm

http://www.philohome.com/motors/motorcomp.htm

The max number of motors can´t be told without knowing which kind of motors you own and want to use. If you mean L motors – 2 of them can be connected at one channel without significant performance loss – compared to the V1 receiver which has a lower current limit. L-motors have a no-load current about 120mA which is much higher than the current limit of M-motors (65mA) or XL-motors (80mA). That was the reason why V2 receivers were introduced for the 9398 crawler set. M – motors are causing problems at V2 receivers for whatever reason, sometimes they don´t work at all, depends on which extensions you are using or not. These problems caused the V2 receivers to be banned from utilization in further models which is very sad btw.

The question is kind of invalid for another reason too: it depends which battery you are using too –whether 9V or rechargeable 7,2V. In general you can say – the more motors you are using at one receiver, no matter if V1 or V2, the less power will be supplied to each individual motor, because all the motors have to share the limited power from 1 battery. It´s better to use 2 x V1 receivers coupled to 1 battery each, than trying to feed as many motors as possible from a single V2 receiver, although its performance is better in high load applications.

If you are forced to save space for receivers and batteries – Sbrick and BuWizz would be the better options for sure.

 

Edited June 17, 2017 by brunojj1

[mocbuild101]

The V2 receiver can handle at least 2x XL or 4x L, per output. If you use more than that, the battery box is more likely to stop than the receiver. (in fact, the V2 can handle way more motors than the battery box can)

Edited June 19, 2017 by mocbuild101

[dr_spock]

The problem with M-motor and IR Receiver V2 is if you're using more than one M-motor on the same output.  Otherwise, M-motor will work with IR Receiver V2.

 

LEGO Power Functions V2 RC Receiver

There has been some confusion regarding the new LEGO Power Functions V2 RC Receiver that is released in the Technic 9398 4X4 Crawler. This component is currently only available through the 9398 set, but was not made exclusively for this product.

The V2 RC Receiver is updated with a CMOS motor driver giving less power loss. This is done to improve the user experience with longer battery lifetime and better motor performance. Unfortunately it has the drawback that it is not able to start 2 or more LPF Medium motors at the same output. As I will explain below this is not a problem with the motor driver, but a known issue with the LPF Medium motor.

The raw motor currently used in the LPF Medium motor internally contains a relatively large capacitor (1 uF) across each of the 3 motor coils. This is done by the motor manufacturer for noise reduction.

We knew that this would be an issue with the new CMOS motor driver (DRV8833). Since it can source a very high inrush current the over current protection will kick in sooner (typically after 2,25 us with a current exceeding 3,3 A). At start up the motor driver will first charge the input capacitance. With 2 or more LPF Medium motors at the same output this can trigger the over current protection. It will repeatedly try to start the motors and you will only hear a singing noise.

For many reasons we have been searching for a higher quality solution for the LPF Medium motor and we now have an approved new raw motor. It has better quality commutation and only 1nF across the terminal. An updated LPF Medium motor will be released during 2013.

Backwards compatibility is of very high importance when we choose new solutions. In this case our decision was that the advantages of the new motor driver together with the fact that we would update the LPF Medium motor would compensate for the inconvenience with the current LPF Medium motor.

We hope this is not causing too many limitations to your model creativity.


Gaute Munch
The LEGO Group

[brunojj1]

I´m not here to defend or criticize TLC product policy, but rather to find out what works and what doesn´t from a neutral perspective.

To add something to the confusion: I don´t know if I was correct on the M-motors having problems on a V2 receiver, probably I have heard that from others. If I remember correctly from my own experience a couple years back, some M- motors worked fine during my design tests of one particular function, but then suddenly didn´t work when another function was added to the receiver, when the model was finished and ready for action. Of course the M-motor was right in the middle of everything and it was great pain to tear it out (and throw it into the garbage can ). According to the following video from our legendary genius Sheepo it seems to be the other way around – some M-motors don´t work on V1 receivers connected directly, but only with extension wires but do work on V2 receivers without problems.

 

Further questions to all doctors who wanna help:

-          Why did glorious TLC discontinue the V2 utilization?

-          Which M-motors belong to the “updated” 2013 version (earliest production week stamped on PF parts)?

-          What is the advantage of the newer updated receiver generation (without V3 mark)?

-          Why do we get the “educational” WeDo crap instead of a completely new PF or Bluetooth system?? I probably know the answer to that one, don´t wanna speak out loud…