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Dear all,
here comes an update:
We successfully installed both the reverse gear and the regen lever on another 2017 DSR with only minor problems. Details that might be of interest:

Regen lever

• Monitor the no-load voltage on the regen lever and make sure the footbrake start voltage value is above it. Won't work otherwise for obvious reasons. I just copied the 0.5 V from my own bike, but this sensor was at 0.57 V.
  
  
• Regen lever has had its first tour test last sunday. Works really well. Feathering starts at 150 RPM and ends together with footbrake braking exit speed at 20 RPM which means regen until just before standstill.
  
  
• Blocking the rear tire will happen with torque at 50% in the traction profiles with full pull on the lever, especially in wet conditions and/or on loose terrain. In this case, regen is going to zero quickly and does not start again when the wheel is spinning again. You will have to release the lever completely and pull it again if you want regen to continue.
  
  
• It might be a good idea to connect the regen lever brake swith to the other brake switches to have the brake light active when you are "regenning". Using the front brake lightly instead every time you apply the regen lever also works and should definitely be done, as noone expects a bike to decelerate that much without brake lights on.
  
  
• Don't forget to exchange the Footbrake swith in RDPO1 by a dummy boolean, as otherwise you will experience full regen torque when applying either of the brakes and you do not want this. 
  
  

Reverse gear

• You may want to adjust the throttle 2 end value voltage to prevent full torque in reverse mode. This value is what the Sevcon wants to see to apply full throttle, so to reduce torque you have to set this value beyond the actual voltage output at full throttle. Does not make too much sense to do it, because the Sevcon is in torque mode, not in speed mode, so you will have virtually no torque in reverse if you increase the value too much. 20V is too much, we checked that. We have now set it to 10V, with usefulness still to prove.
  
  
• Reverse speed limitations seem to be ignored by the Sevcon. Most likely not because it runs in torque mode, as forward speed limitations can be applied (and are applied in eco mode). Any hints welcome.
  
  
• The Sevcon has an inching mode for low speeds (both forward and reverse), but we were not able to apply it. We tried switching it together with the forward/reverse switch and seperately.

Detailed documentation is in progress.
Thanks again to all helping commentators.

John

Yes, of course you can go operational when connected. In fact, you have to do it, because if you forget to go operational before disconnecting, your bike will be a brick. BTDTNT

And being operational when connected, you will see the analog values of the throttle and the regen lever, and you will also see the FS1 switch go to active when you hit the throttle. But the bike will not run, the rear wheel will not spin. And the forward or reverse switch will not show up in the I/O monitor.

And here comes the update:

1) rgutt is hereby officially appointed to Reverse Hero. 

2) The reverse works, and setting  throttle end value 2 to -1 was all that was missing to get it to work.

3) In the I/O monitor on DVT, you will not see the DIs go from inactive to active as you turn the throttle, at least not the forward and reverse inputs. What you will see switch from inactive to active is the FS1 switch, but this is independent from the direction switch: In forward, off and reverse position, the I/O Monitor will show exactly the same.

I cannot say that I understand all this, but I now know that it works and how to make it work.

I will take the next machine in my hand (will come shortly out of my local Zero community) to document in detail for both EMCF and the unofficial manual.

Thanks to all of you helping me with your posts.

Regards
John

Thanks, Demoni,
but I have to admit my confusion only grows. 
Especially regarding possible grounding, i.e. connecting a PIN to B-:

My understanding is that if I want to close a DI, i.e. switch it ON, I would have to connect it to B-.
In case of the Forward switch that is normally  connected to MBB19, my understanding was that this closes the contact. If I cut this wire, the Zero doesn't move. From this I deducted that no connection equals OFF. Problem is that connecting the Reverse PIN to exactly that MBB19 PIN where the forward switch is connected to with the Zero moving forward, it does not make the Zero go backwards. And havin assigned the proper PIN to REVERSE it should not matter if I do this with PIN 30 or 31 or any other pin that can be assigned to REVERSE in the DVT software.

I must admit that I have no clue what MBB19 PIN does or is. One could try to connect SEVCON 18 (forward) to B- and see if the Zero drives or not.

From my point of view, I simply exchange PIN18 by a PIN assigned to REVERSE in the DVT with a switch, so the Zero should go reverse. As this obviously does not work, the problem has to be somewhere else. It is not the throttle2 values as I configured these as well, and, by the way, the manual states that throttle 1 values are taken as throttle 2 values if throttle 2 values are all zero.

Rewiring and trying various connections is quite time consuming and my fear is to destroy something with wrong  wiring, so before trying this and that I would like to have a plausible explanation why this should work. It does work for older bikes, so the problem will most likely be in the MBB programming that I cannot access.

So when you write

Sorry I mistyped, You are 100% correct the unused input should be connected to B-. Like you are already doing.

this is not what I am doing. The unused contact is left unconnected to anything. The used contact connects to MBB19 and my question was if it should go to B- instead of MBB19.


My hope now is that Brian may disclose the workaround he mentioned here on EMCF.

And meanwhile, I will be doing some testing with DVT regarding the signal visibility.

Okay, I set Reverse Switch 0x2122 0 to zero again. I also set the Voltages for Throttle 2. There is no change in behavior, reverse still does not work.

Regarding the wiring:
Without the reverse installation, Sevcon18 (Forward switch) is connected to MBB19. I cut this wire and put the switch in between. Now when the switch is in forward position, Sevcon18 connects to MBB19 as before. With the switch in reverse position, Sevcon31 connects to MBB19. I assigned reverse to Pin 31 in DVT instead of 30 because I was told that there will be a problem when using 30. Should Pin31 connect to B- instead when switch is set to reverse? And if yes, why? Having a DPDT switch installed, this could be rewired.

I was also told that together with reverse also FS1 should be connected to B-. Is that true? I have no idea what FS1 really does. My understanding from Sevcon manual is that FS1 closes when throttle is applied, but what is the implication for reverse here?

Regards
John

Dear all,
I have read what I think are all the threads dealing with a reverse gear option for Gen2 models, in my case a 2017 DSR. I did what the threads suggested, but with no success. What I did is:
- I installed a DPDT switch (used as a SPDT) to reroute the connection coming from MBB19 and going to Sevcon18 from 18 to 31.
- I added Digital input 4 in DVT (Sevcon PIN 31) as reverse switch, since the standard Reverse PIN 30 on the Sevcon is assigned to the idle switch.
- I  set 0x2122 0 (Reverse Switch) to "active".

Result: Doesn't work. 
Forward works when switch is in forward position.
When in neutral or in reverse position, nothing happens.

BrianTRice wrote in 2020 he managed to get it to work but did not explain how.
What did I miss? Would it make sense to switch Pin31 to B- instead of MBB19?

Any help is highly appreciated.

Rehards
John

Hi, sorry for unburying the dead, but did you ever manage to add reverse to your DSR? It seemed to me from your post that you'd principally know how to do it, which is way more than I know.
I bought a 2017 DSR last November, and riding it offroad mainly, there have been various situations where a reverse would have been more than handy.

Cheers
John