Double slip - strange point motor action

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RogerB
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Double slip - strange point motor action

#1

Post by RogerB » Mon Jan 14, 2019 3:40 pm

I am trying to put solenoid point motors on a double slip. When off the point the motor works perfectly and the tie bar moves correctly. On the point and under manual control the motor moves fully in both directions but will only move fully in one direction under power. When I attempt to fire it the other way it moves a little in the proper direction and then goes back again - a sort of shimmy!

I have tried the Hatton's PM-01 motors and the Peco PL-11 ones. Both behave the same. I am sure I am not tightening them up too much and they are properly aligned. I have a 12v 1A PSU and have wired the points up to a choc block. To fire them I am just touching the appropriate terminals on the choc block - very briefly.

Anyone got any ides?

R-
Not sure if I have plenty of time on my hands - or I’ve simply forgotten to do something really important.

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Steve M
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Re: Double slip - strange point motor action

#2

Post by Steve M » Mon Jan 14, 2019 6:01 pm

Are you using a CDU? If not that supply probably isn’t giving it enough ‘oomph’ (technical term).
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Re: Double slip - strange point motor action

#3

Post by Mountain Goat » Mon Jan 14, 2019 6:03 pm

It is normally the case that the solenoid movement is not quite the same direction as the movement of the tie bar. I used to get this at times when I mounted Peco solenoids directly underneath the Peco points. If they were not quite 100% pushed into their slots, they could on occasions give the symptoms in which you have described.
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RogerB
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Re: Double slip - strange point motor action

#4

Post by RogerB » Mon Jan 14, 2019 6:40 pm

Steve M wrote:
Mon Jan 14, 2019 6:01 pm
Are you using a CDU? If not that supply probably isn’t giving it enough ‘oomph’ (technical term).
I did wonder about that but also thought that 12V @ 1A would be sufficient. I will get hold of a CDU and have another go.

Thanks.

R-
Not sure if I have plenty of time on my hands - or I’ve simply forgotten to do something really important.

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Re: Double slip - strange point motor action

#5

Post by RogerB » Mon Jan 14, 2019 6:43 pm

Mountain Goat wrote:
Mon Jan 14, 2019 6:03 pm
It is normally the case that the solenoid movement is not quite the same direction as the movement of the tie bar....
Surely it is, but anyway if it were the wrong direction it should still be the full amount of travel.
Mountain Goat wrote:
Mon Jan 14, 2019 6:03 pm
If they were not quite 100% pushed into their slots....
This has got me a little confused. Can you tell me where the slots are you describe please?

R-
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Re: Double slip - strange point motor action

#6

Post by Walkingthedog » Mon Jan 14, 2019 7:19 pm

I think a CDU is essential.
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Re: Double slip - strange point motor action

#7

Post by RogerB » Mon Jan 14, 2019 7:22 pm

It appears so - I know there's one around here somewhere. R-
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Re: Double slip - strange point motor action

#8

Post by Steve M » Mon Jan 14, 2019 7:45 pm

MG, Roger is using surface mounted points PL11 not the type that fit under the board.
As I said it’s more likely to be the lack of a CDU that is the issue although alignment can sometimes be an issue.
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Re: Double slip - strange point motor action

#9

Post by Mountain Goat » Mon Jan 14, 2019 9:58 pm

Peco points have four little slots which four pointy tabs on the point solenoids fit into.
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Re: Double slip - strange point motor action

#10

Post by Steve M » Mon Jan 14, 2019 11:17 pm

Mountain Goat wrote:
Mon Jan 14, 2019 9:58 pm
Peco points have four little slots which four pointy tabs on the point solenoids fit into.
But neither of the motors Roger is using are of that type!
Deja Moo: The feeling that you've heard this bull before. ;)

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