[R-1051] R-1051 Motor Problem

[Larry Kirkland]

Thanks for the comments, Tony.  I got frustrated with it and set it 
aside while I did some antenna work.  I am ready to get back on it 
again.  I will check to make sure the relay is grounding the motor 
terminal to brake it faster when the power is removed.  I'll let you 
know what I find.
73's
Larry

Tony Snider wrote:

> Larry,
> many of these motorized tuning circuits use a relay to supply power to 
> the drive motor and when the target position is met the relay removes 
> 28vdc from the motor and grounds the motor's 28vdc terminal to brake 
> the motor, I cannot remember for certain if this is the case for that 
> module but a know that the rf amp works that way, anyway if you loose 
> the relay it will go around, you will hear the relay click and it goes 
> around again
> just a thought
> Tony
>
>
>
> ----- Original Message ----- From: "Larry Kirkland" <lkirkland at sc.rr.com>
> To: "R-1051 Discussion Group" <r-1051 at mailman.qth.net>
> Sent: Wednesday, June 14, 2006 10:07 AM
> Subject: Re: [R-1051] R-1051 Motor Problem
>
>
>> Cecil and group;
>>
>> Here's where I am with getting the R-1051 running.  I cleaned up the 
>> stuck motor that selects the crystal position in the MCS Synthesizer 
>> module. Now it runs fine, maybe too well.  When I select a new MC, 
>> the motor runs to the correct switch position, 28 vdc is shut off the 
>> motor, but the motor coasts past the correct point as it is spinning 
>> down and touches onto the next switch position where 28 vdc is 
>> supplied again.  the motor starts up again, the switch makes another 
>> 360 degrees and the process repeats itself.  It's like the motor is 
>> not dynamically braking or there is not enough friction to stop the 
>> motor fast enough. Have you ever seen this happen?
>>
>> Larry W4LK
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>
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