I wired the primary side: lugs 2 and 6 at the transformer, plug socket, fuse F1, the power switch and the center lug of plug socket to the chassis and measured the voltages at the power transformer (against star ground) and got wierd results:
PT Primary side pin2: 0V pin6: 220V
PT Sec. side: pin8: 33V pin9: 35V pin11: 15.5V pin12 19.9V
pin13: 14.7V pin14: 16.1V
Results were obviously wrong and I'm wondering what I'm doing wrong. I tried to check that every wire goes to the right place (I know that this could be where I'm doing a mistake but so far I couldn't find a mistake). Any guide lines what to do or does this sound familiar to anybody? I'll post couple of pictures tomorrow.
M15Mk1 voltage problems
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Re: M15Mk1 voltage problems
Hi,
have you wired the secondary side of the PT too, or just the primary? If the secondary side of the PT is not wired at all, you can't measure the right voltages against ground, only between the two lugs of each voltage (230V, 20V, 6,3V) because you don't have a reference (the voltages are floating).
Regards, Martin -
Re: M15Mk1 voltage problems
Hi,
Do you mean that in this phase when I have wired only the primary side, I can measure voltages only between
lugs 2 and 6, 11 and 12, 13 and 14 for the right results? -
Re: M15Mk1 voltage problems
Exactly (and that's the way it's proposed in the documentation too ;))
Regards, Martin -
Re: M15Mk1 voltage problems
I should have understood all this but I've only dealt with stomboxes (DC) and here are the results:
2-6: 224V
8-9: 260V
11-12: 23.1V
13-14: 7.25VThanks...
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Re: M15Mk1 voltage problems
That´s all ok.
224V is the primary voltage.260v is the secondary voltage 1. (supposed to be 230v, but these transformators are a little bit stronger)
23.1v is the 20v tap
7.25v is the heating tap (6.3v)
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