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Unread 05-15-2018, 12:08 AM   #1
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Default Purpose of diodes in new Alltrax SR diagram?

Just downloaded a new copy of the SR manual, and they added several new wiring diagrams. The one I'm using is the Generic Series with SW202 Reverse.
There's a few diodes I've not seen in other diagrams, and was wondering if they're really necessary, or beneficial.

I've attached a copy, with markup.
Opinions welcome!
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File Type: pdf SR Wiring (Mkd).pdf (160.1 KB, 0 views)
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Unread 05-15-2018, 07:05 AM   #2
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Default Re: Purpose of diodes in new Alltrax SR diagram?

If You are using a SPDT switch to control both the Reversing Contactor and the KSI Controller power, then the diodes are required to keep the Forward and Reverse Solenoid coils isolated from each other.

The alternative is to use a DPDT switch where one pole controls which Reversing Contactor coil gets power and the other pole simply interrupts the KSI power when the switch is in Neutral.
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Unread 05-15-2018, 07:08 AM   #3
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Default Re: Purpose of diodes in new Alltrax SR diagram?

For what I remember, those diodes are part of the actual F&R switch, they aren't an additional diode.

but I'm sure that someone like JohnnieB will see this and chime it to set the record straight.
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Unread 05-15-2018, 12:09 PM   #4
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Default Re: Purpose of diodes in new Alltrax SR diagram?

As Sergio mentioned, without the steering diodes you'd have both coils of the reversing contactor energized and the half speed reverse activated at the same time with either F or R selected on the F/R switch.

Also looks like Alltrax needs to go back to the drawing board. They have a nonexistent switch in the main solenoid activation circuit. The "run-switch" between keyswitch and fuse does not exist if the original F/R assemble that the reversing contactor replaces was removed.

Personally, I would wire the new On-Off-On switch in after the foot switch and eliminate the need of steering diodes.
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Unread 05-15-2018, 12:18 PM   #5
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Default Re: Purpose of diodes in new Alltrax SR diagram?

Quote:
Originally Posted by JohnnieB View Post
As Sergio mentioned, without the steering diodes you'd have both coils of the reversing contactor energized and the half speed reverse activated at the same time with either F or R selected on the F/R switch.

Also looks like Alltrax need to go back to the drawing board. They have a nonexistent switch in the main solenoid activation circuit. The "run-switch" between keyswitch and fuse does not exist if the original F/R assemble that the reversing contactor replace was removed.

Personally, I would wire the new On-Off-On switch in after the foot switch and eliminate the need of steering diodes.
another published rough draft
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Unread 05-15-2018, 12:30 PM   #6
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Default Re: Purpose of diodes in new Alltrax SR diagram?

Also, where is the reverse beeper.

A good ambulance chaser might find that oversight interesting.
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Unread 05-15-2018, 12:57 PM   #7
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Default Re: Purpose of diodes in new Alltrax SR diagram?

I shared my conversion diagram with Alltrax tech this AM complete with foot switch and rev beeper. Because we have been routing current differently than what they show and I wanted their feedback, as usual.
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Unread 05-15-2018, 02:05 PM   #8
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Default Re: Purpose of diodes in new Alltrax SR diagram?

Quote:
Originally Posted by scottyb View Post
I shared my conversion diagram with Alltrax tech this AM complete with foot switch and rev beeper. Because we have been routing current differently than what they show and I wanted their feedback, as usual.
in other words.....you were telling them they are doing it WRONG!!! LOL

ROFLMAO.gif
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Unread 05-15-2018, 02:53 PM   #9
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Default Re: Purpose of diodes in new Alltrax SR diagram?

Thanks Johnnie.

I'm going to ignore the Alltrax version and run B+ to the F/N/R switch from the solenoid (switched by pedal).
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Unread 05-15-2018, 03:13 PM   #10
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Default Re: Purpose of diodes in new Alltrax SR diagram?

Just keep in mind there is a reason why that is not done by factory.

if You run the FNR after the pedal switch, You will be able to change directions without interrupting the current flow and potentially damage the Reversing Contactor.

Of course all you have to do is always lift your foot off the pedal before changing directions, but best practice is to have an "anti-arcing" circuit in the FNR.
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