Put the RT-21 in DEBUG mode. That disables all error checking. Then use the
CW/CCW buttons to try and jog the motor. Then you’ll know for sure if it’s
movable; you’re basically just applying voltage to the motor leads. If it won’t
move, verify that it’s putting out DC and not AC. Hopefully it will move, then
you can check the pot resistance. If the resistance makes sense but the display
is wrong, then maybe there is a configuration or wiring error. (I have the
exact same combo, bought as a set and pre-configured from GH.)
-Gary NA6O
> Subject: [TowerTalk] Yaesu G-2800 problem with new unit
>
> I hooked up my brand new RT-21 Green Heron controller to a brand new G-2800.
> On the ground thru the final cable.
>
> The rotor will not turn and the GH controller says Error No Motion. Lots of
> checks and the motor winding is open, pins 4 and 5 on the rotor itself.
>
> Upon initial test, I had no idea where the rotor was in its range. The
> RT-21 said 263 when it was turned up while being connected to the rotor. I
> used the point and shoot knob and set it to about 180 deg, the end of travel
> limit, I believe. While watching the rotor from 20' away, I saw it move
> momentarily. It has not moved since.
>
> Looking at the documentation, I assume that the limit switches in the
> rotator are open in some way that will not allow current to the motor. Or,
> that there is an internal wire failure or the filter unit PCB in the rotor
> has an open.
>
> I note that the internal potentiometer is at end of range at 500 ohms as
> measured from pins 1 to 2 and 1 to 3 of the rotor. Pins 2 to 3 is
> essentially a short.
>
> I believe the RT-21 is working fine and all the cable and connectors have
> been checked till I am sick of testing!
>
> I am hoping someone has some experience with this such that I can get it
> going.
>
> Al
>
> N6TA
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