I got this old KR-400 azimuth rotor as a gift, but is wired for 220V and I need to run it off of 110V. The transformer's wiring now looks like this:
| 220V | | | |~~~~|~~~~| |~~~~|~~~~| 5 1 3 6 2 4 | | |__________________|
If the drawing is messed up, here is the gist of it: The primary consists of two (parallel/separate) windings, one with odd, one with even numbering (3-5 and 4-6) with the center of the winding named 1 and 2. Currently 2 and 5 are shorted and 220V comes in at 1 and 6. So current flows from 1 to 5 to 2 to 6 and vice versa.
To rewire to 110V I guess I just use any of the combination 1-3, 1-5, 2-4 or 2-6. But I am just curious why the 220V wiring was done over two coils, not one? Was this factory standard or has my unit been modified with a different transformer?
Once I get the control unit powered up it time to test the rotator and see if it needs any maintenance (probably will, because it hasn't been used for a long while).