[TowerTalk] Or2800DC smoking control box

Zivney, Terry 00tlzivney at bsu.edu
Fri Jun 1 06:36:03 PDT 2012

Les, W2LK said:

The OR2800DC runs on 30-47VDC. Polarity determines rotation direction 
and voltage determines speed.
If the control box is smoking, there is probably a stray wire strand 
shorted in the control cable somewhere.
I would think that the likelihood of a short in the rotator itself is low.
Pins 1 & 2 on the rear of the controller are the turning voltage.
Pins 5 & 6 are around 10V, low current, used for the pulse counter and 
shouldn't be a problem.
Recheck the controller cable connections for stray strands or cracks/cuts.
Les W2LK


A DC motor should turn (slowly) on well under the rated operating

A short in the 'control wire' will not cause smoking.  The reed switch
in the rotor SHORTS terminals 5 & 6 in normal operation; shorting
and opening those terminals is how the control box determines
the location of the antenna (counting pulses).

Terry N4TZ

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