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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