Terminals A-C are clearly the secondary connections. I trick to help sort
out the primary connections is to apply 120vac to the secondary and start
measuring voltages on the primary connections. Once you have fully identified
hopefully are a pair of 120vac primary windings (with taps) you can develop
a schematic of the transformer. You can determine phasing of the primary by
connecting the two windings in series. When in phase, the voltage will be two
times. When out of phase voltage will be near zero.
Since the secondary is rated for 1160vac, you would expect to see about
12vac on the primary connections during the above testing. With the primary
windings in phase connected the voltage will be about 24vac.
Hope this helps.
In a message dated 12/27/2005 3:05:24 P.M. Central Standard Time,
I'm hoping there is a transformer guru out there who can help me figure out
how to use a transformer I bought on E-you-know-what. It was billed as a
primary, 1160 V @2.65 A secondary power transformer, and I am hoping to use
it in a voltage doubler to get about 3000+ VDC for 3-500's or similar.
However, I can't figure out the connections. The leads are marked as
(1) (2) (3) (4)
(5) (6) (7) (8)
50 Hz 60 Hz (Blank) 170 V 185 V
200 V (N/C) 215 V 230 V
50 Hz 60
Hz 1160 V
The numbers and letters in parentheses don't appear on the terminal board,
but I identified them here so I could report the DC resistances (and N/C
there is no wire connected to that terminal), which are as follows:
1 to 2: 0.3 Ohms
1 to 8: 0.75 Ohms
2 to 8: 0.6 Ohms
3 to 8: 0.6 Ohms
4 to 8: 0.55 Ohms
5 to 8: 0.5 Ohms
6 to 8: open circuit
7 to 8: 0.3 Ohms
A to B: 1.1 Ohms
A to C: 9.2 Ohms
B to C: 8.4 Ohms
The transformer is identified as a Type HMB-120-4A, Mfg # KD-14634, Lamp
(blank), Input 200 V, Output 1160 V 2.65 A, Mfg Date 4-01, ORC Manufacturing
The only info I can get off the internet is that ORC Manufacturing Company
Ltd makes large scale systems for IC chip manufacturing and such, apparently
using a photoelectric process.
Any ideas as to how to hook this beast up? It's brand new, beautifully
constructed, potted and everything, but am I out of luck in using it for an
Thanks for any help you can give!
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