[TowerTalk] Looking for UST Control Box

[Bob K6UJ]

Rick,

That's very good to know about the contactor sticking possibility.
I always watch everything when I raise or lower my HDX-589MDPL motorized 
tower.
I made a 25 foot remote control with up/down/off switch mounted in a duplex
electrical receptacle box so I can stand in the yard away from the tower 
and watch
everything as it goes up or down.  I am thinking now of adding a 
"master"power cutoff
switch to my remote switch box.  Looks like I will need to replace the 
cable to one with
two more conductors for the adding the master power switch.
Thanks for the info on contactor switching.

Bob
K6UJ





On 7/23/16 4:41 PM, Richard (Rick) Karlquist wrote:
>
>
> On 7/23/2016 3:25 PM, Roger (K8RI) on TT wrote:
>>
>> I'd definitely want limit switches.  They are good insurance.
>>
>> 73
>>
>> Roger (K8RI)
>>
>
> Actually, limit switches are NOT good insurance.  They
> don't protect against the contactor sticking.  The
> contactor used is the same kind that air conditioners
> use, and air conditioner contactors are famous for
> sticking.  Read about that on the internet.
>
> What you need for insurance is a local (on the box)
> power switch that cuts the power to the MOTOR.  The
> power switch built into the control box only cuts
> the power to the coil of a relay that in turn cuts
> the power off to the COIL of the contactor.  I had
> to add a real power cutoff switch to the box.
>
> I have had a contactor stick twice.  Fortunately, I
> was standing next to the control box monitoring
> when it happened and was able to pull the big switch.
>
> Rick N6RK
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