Hi,
I saw the schematic and immediately thought " this is a SIEMENS industrial schematic from the 1970s".
Now I saw it's from the 1990s.
I think the symbols are more "SIEMENS style" than "German style". But are outdated now, hopefully.
I work a lot with such old circuits, because SIEMENS stopped support... and some big industrial plants need repair/replacemen parts/ or improved modern replacement.
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Are these means connector X pin1 for example? Then why all of them have 1?
Yes, it's the pin name. But not all of them have just one pin.
--> Blatt 3 (page 3) X570, X2 for example
2- 1M, 2M, 3M, ... could be found in P1, P2, P3 .are these ground? if not seems there is no ground.
1M... is GROUND.
"M" is the abbreviation for the (mature) German word "Masse" = GND.
Btw: on page 1 right sude there is a hand written translation of "Masse Sternförmig".
--> Translate it with "star connected GND".
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P1, P2 most likely are testpoints (maybe: German "Prüfpunkt")
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2P24V: I'm not sure
* either there are several independet 24V power supplies denoted with 1P24V, 2P24V
* or there is one 24V power supply with several 24V connections (non isolated). I think this is more likely.
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For example N1 07, N1 4051, N5 324, N2 07, N4 4051,
N1, N2, N3 ---> should be IC1, IC2, IC3 ... just the name
The next lines are assumptions
07 --> OP07 (precision Opamp)
4051 --> CD4051 (CMOS analog MUX)
324 --> LM324 (quad standard Opamp) note: you see several N5 324, because there are 4 Opamps in one package
785 --> TCA785 (phase control IC)
And the big one in bottom of page 1 is a "high power dual SCR"
Klaus
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Added:
At pin 6 of X570 there should be about 13 V but I have 3.9 V.
3.9V makes sense.
13V not - at least not in a closed loop.
At first sight it seems the Opamp output is in positive saturation...but V28 should prevent the voltage to go beyond 8.2V.
There are a lot of possible causes. Please use a high ohmic DVM and measure all 8 pins of the Opamp w.r.t. GND and tell us the values.
Btw: The Opamp circuit is part of a PI or PID regulation loop. With the MUX and it's control pins x570 - 15, 16, 17 one can digitally adjust the regulation characteristic.
(Without closed loop it surely will saturate, because of it's "integral behaviour".
Klaus