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Misconnected motor cables


 

As we all know its horribly easy to insert the standard Losmandy DIN motor
cables incorrectly which wreaks havoc with the motor encoders and decoder
ICs.

I did this myself while repairing a G-1 recently, and only just caught the
problem before I turned it on (which would have destroyed the new motor
encoder and decoder IC I had just fitted).

So I tried to insert *my own* motor cables incorrectly. It was almost
impossible to do so because they're made up with good quality metal DIN
connectors rather than the cheap moulded ones with stamped metal outer
section used on the stock cables.

I recommend the Deltron 610-0600 (or similar) for use with the G-1 and early
(large) G-2. I think (but am not sure) that the Gemini-2 Mini is fitted
with Lumberg KGV-60 or KGR-60 sockets (or similar threaded joint DIN), in
which case I'd recommend the Lumberg SV60 plug (or WSV60 for a right-angle
version) for the controller end of the cable and the Deltron for the other
end.

So I'd strongly advise everyone to make up their own cables (or get a friend
to do so) using good quality metal din connectors and twisted pair cables
(stranded Cat-6 would work well) wired as follows:

Wire pin 1 to pin 1, 2 to 2 ... 5 to 5. Use one pair for pins 1 and 5
(motor power cables), one pair for pins 2 and 3 (Encoder Channel A and
Encoder Ground), and one pair for pins 4 and 6 (Encoder Channel B and
Encoder +5V), and.

If you use screened cable connect the screen to the plug body.

David Partridge


 

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Thank you David, this is good information.



Sent from my Boost Mobile Phone.


-------- Original message --------
From: "David C. Partridge" <david.partridge@...>
Date: 2/11/20 12:19 PM (GMT-06:00)
Subject: [Losmandy_users_io] Misconnected motor cables

As we all know its horribly easy to insert the standard Losmandy DIN motor
cables incorrectly which wreaks havoc with the motor encoders and decoder
ICs.

I did this myself while repairing a G-1 recently, and only just caught the
problem before I turned it on (which would have destroyed the new motor
encoder and decoder IC I had just fitted).

So I tried to insert *my own* motor cables incorrectly.? It was almost
impossible to do so because they're made up with good quality metal DIN
connectors rather than the cheap moulded ones with stamped metal outer
section used on the stock cables.

I recommend the Deltron 610-0600 (or similar) for use with the G-1 and early
(large) G-2.? I think (but am not sure) that the Gemini-2 Mini is fitted
with Lumberg KGV-60 or KGR-60 sockets (or similar threaded joint DIN), in
which case I'd recommend the Lumberg SV60 plug (or WSV60 for a right-angle
version) for the controller end of the cable and the Deltron for the other
end.

So I'd strongly advise everyone to make up their own cables (or get a friend
to do so) using good quality metal din connectors and twisted pair cables
(stranded Cat-6 would work well) wired as follows:

Wire pin 1 to pin 1, 2 to 2 ... 5 to 5.?? Use one pair for pins 1 and 5
(motor power cables), one pair for pins 2 and 3 (Encoder Channel A and
Encoder Ground), and one pair for pins 4 and 6 (Encoder Channel B and
Encoder +5V), and.

If you use screened cable connect the screen to the plug body.

David Partridge





Sonny Edmonds
 

The cables for my RA and Dec on my new GM811G would be terribly hard to plug in wrong.
They have a steel guide shroud, with a dimpled guide, and they are marked "Top" to help locate the correct orientation.

One of my bigger concerns is unplugging and connecting them every night of use causing excessive wear.
--
SonnyE


(I suggest viewed in full screen)


 

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Sonny, that dimple is not very stout and it will go in wrong. Michael is repairing one now, and
that's what happens to it. Others have done it to. Marking them is easy and cheap.



Sent from my Boost Mobile Phone.


-------- Original message --------
From: Sonny Edmonds <sonnyedmonds@...>
Date: 2/11/20 3:16 PM (GMT-06:00)
Subject: Re: [Losmandy_users_io] Misconnected motor cables

The cables for my RA and Dec on my new GM811G would be terribly hard to plug in wrong.
They have a steel guide shroud, with a dimpled guide, and they are marked "Top" to help locate the correct orientation.

One of my bigger concerns is unplugging and connecting them every night of use causing excessive wear.
--
SonnyE


(I suggest viewed in full screen)


 

>>> One of my bigger concerns is unplugging and connecting them every night of use causing excessive wear.

i haven't run into that issue and i've been plugging/unplugging for maybe 8 years now. but you do have to go slow and be mindful

is there any way you can leave most of it connected and just move just the head?

On Tue, Feb 11, 2020 at 1:16 PM Sonny Edmonds <sonnyedmonds@...> wrote:
The cables for my RA and Dec on my new GM811G would be terribly hard to plug in wrong.
They have a steel guide shroud, with a dimpled guide, and they are marked "Top" to help locate the correct orientation.

One of my bigger concerns is unplugging and connecting them every night of use causing excessive wear.
--
SonnyE


(I suggest viewed in full screen)



--
Brian?



Brian Valente
portfolio


 

Thanks! I see those connectors are under $5 each and available from Newark.com.?


Do you have a recommendation on the raw cabling to use?

I am an experienced cable/harness maker but that was many years ago!
--
Rick Paul
Tucson, AZ


 

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It can be made. David Partridge, gave us the wiring key. Andma better brand of connectors.



Sent from my Boost Mobile Phone.


-------- Original message --------
From: "Richard Paul via Groups.Io" <rickpaul@...>
Date: 2/11/20 4:08 PM (GMT-06:00)
Subject: Re: [Losmandy_users_io] Misconnected motor cables

Thanks! I see those connectors are under $5 each and available from Newark.com.?


Do you have a recommendation on the raw cabling to use?

I am an experienced cable/harness maker but that was many years ago!
--
Rick Paul
Tucson, AZ


Sonny Edmonds
 

Oh yeah, Brian, I do leave as much together as possible.
But every time a connection is plugged together or taken apart, it's a metal on metal wear.
I know I wore out some USB connectors with constant connecting and disconnecting. Not the same as a DIN connector, I know.
But it makes me wonder, what with connecting and disconnecting the motors every use.
Having spent my life working on electrical and control systems, I'm very careful when connecting things.

Great call on the plugs for the unused ports. I got red ones so I can find them if they go astray.
--
SonnyE


(I suggest viewed in full screen)


 

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Thank you - ?I just looked at the pictures on the website!? It would appear that Losmandy have changed the cables to ones that will definitely be much harder to plug in incorrectly.

?

David

?

From: [email protected] [mailto:[email protected]] On Behalf Of Sonny Edmonds
Sent: 11 February 2020 21:16
To: [email protected]
Subject: Re: [Losmandy_users_io] Misconnected motor cables

?

The cables for my RA and Dec on my new GM811G would be terribly hard to plug in wrong.
They have a steel guide shroud, with a dimpled guide, and they are marked "Top" to help locate the correct orientation.

One of my bigger concerns is unplugging and connecting them every night of use causing excessive wear.
--
SonnyE


(I suggest viewed in full screen)


 

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I’m making up a set for a user in Italy in the next few days – I’ll be using External grade Cat6 cable (23 AWG stranded copper conductors).

?

David

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Paul via Groups.Io
Sent: 11 February 2020 22:08
To: [email protected]
Subject: Re: [Losmandy_users_io] Misconnected motor cables

?

Thanks! I see those connectors are under $5 each and available from Newark.com.?


Do you have a recommendation on the raw cabling to use?

I am an experienced cable/harness maker but that was many years ago!
--
Rick Paul
Tucson, AZ