Dear all, I have attached part of an old machine electrical schematics. In the schematics there are symbols of rectangular and square shape inside these shape the following presents
1. Just the figure 1
2. Greater than or equal to 1 seemingly
3. S and R
4. Inverted triangle and 2A

Any one who knows the meaning

 

The first three appear to be IEEE logic symbols (which I've never been a fan of).

The 1 is an inverter (NOT gate)
The >=1 is an OR gate.
S and R is an RS latch.

I don't know about that last one.

 

The first three appear to be IEEE logic symbols (which I've never been a fan of).

The 1 is an inverter (NOT gate)
The >=1 is an OR gate.
S and R is an RS latch.

I don't know about that last one.

Thanks WBahn, is the last set reset latch?

 

Thanks WBahn, is the last set reset latch?

I said I didn't know what the last one was. It may not be a logic device at all.

The one with the S and R is almost certainly an SR latch (or RS latch, same thing).

 

I said I didn't know what the last one was. It may not be a logic device at all.

The one with the S and R is almost certainly an SR latch (or RS latch, same thing).

Sorry for making the confusion. When I said the last one, I was referring to the R S latch

 

Dear all, I have attached part of an old machine electrical schematics. In the schematics there are symbols of rectangular and square shape inside these shape the following presents
1. Just the figure 1
2. Greater than or equal to 1 seemingly
3. S and R
4. Inverted triangle and 2A

Any one who knows the meaning

Hello,

It usually helps to post a diagram that is not rotated and a little more clear.
Here is a version of the original drawing cleaned up a little and rotated for easier viewing.
I take it you are referring to that block near the center of the drawing with the inverted triangle.

 

Hello again,

I remember seeing that symbol on a physical relay used in an automobile.
I cant say for sure that your drawing has a relay there, but maybe that's it. It would make a lot of sense if the block below it was a motor. Going from logic to drive a motor would require something like a relay or transistor.
If it is a relay, the input would be on the left and the output on the bottom, and the logic control terminal on the top.

 

Siemens: How to read German Schematic Diagrams

 

Dear MrAI,
Thank you, I followed your comment on the picture and I rotated the next pic before uploading. And most of the items that follow that component are solenoids. And another the same device but with only one input and one output has units of mA already the previous has 2A. These info and the attached pic may supply helpful hints

Hello,

It usually helps to post a diagram that is not rotated and a little more clear.
Here is a version of the original drawing cleaned up a little and rotated for easier viewing.
I take it you are referring to that block near the center of the drawing with the inverted triangle.

 

Dear MrAI,
Thank you, I followed your comment on the picture and I rotated the next pic before uploading. And most of the items that follow that component are solenoids. And another the same device but with only one input and one output has units of mA already the previous has 2A. These info and the attached pic may supply helpful hints

Hello,

It usually helps to post a diagram that is not rotated and a little more clear.
Here is a version of the original drawing cleaned up a little and rotated for easier viewing.
I take it you are referring to that block near the center of the drawing with the inverted triangle.

 

did you look at the rest of the schematics? did you check if there is a legend?

 

normally that is known as 'del' or 'nambla' symbol and it is used in mathematics to compute gradient. not sure what it is meant by it in this case. so why not follow the wiring and see what it leads to?

normally triangle means driver/buffer/amplifier with signal being "amplified" in the direction of the triangle. so this may be just solenoid driver that is triggered by logic level of the SR latch.

in this case it is driving relay labeled "Preparing Motor On".

 

Interesting indeed! If the notations were to be translated possibly the meaning would be clearer.One thing is a bother, which is the connection symbols, which possibly indicate that it could be a pneumatic drawing, except for the switch symbols. Or they might be showing the orientation of push-on connectors which could be for solenoids. One other consideration is that it is very difficult to interpret a sentence one word at a time, out of sequence.
That means that if we were able to guess what the machine was, it would be more likely that we could understand what the parts might be, from knowing their functions.

 

Dear MrAI,
Thank you, I followed your comment on the picture and I rotated the next pic before uploading. And most of the items that follow that component are solenoids. And another the same device but with only one input and one output has units of mA already the previous has 2A. These info and the attached pic may supply helpful hints

Hi,

Ok, with these two new drawings (much clearer BTW) it looks like we would have to see the entire drawing of the entire system to figure out exactly what these blocks are supposed to represent. The "8ma" block only has two terminals showing so that's different than the one with "2A" which has three terminals. That's if we assume that these two nomenclatures are there to indicate some kind of current flow, which does seem reasonable right now.

If we could see more of the entire drawing(s) it may help to figure this out.

 

One more question is if the drawing is for a system or whatever it is, that the TS actually has access to. I am wondering now just what it really is. One possibility is that it is not a circuit drawing but rather more like the architects drawing that just covers the power flow, not the actual connections.
Of course, given that it is a German drawing from the distant past, it could possibly predate any sets of standard symbols.

 

Dear all,
Below is the additional info's you required
1. It is electrical drawing not pneumatic
2. The machine is injection machine Krauss Maffei model KM 250-600A
3. I will add another pictures when I come back to the place
4. I tried to find from the legend. But again I will check if I overlooked

 

I just did a search for that machine model number, and found one built in 1999. So it may not be that ancient, maybe. And certainly the company is still in business. So additional information may be available from the source.

 

Dear all,
In the schematics (attached) I have seen a card which contains these 4 items. Then I followed that card physically and i noticed that it contains 4 power transistors I have attached a photo. Therefore, it seems that object is transistor. Beside a have attached a full pic of that object

 

The drawings were interesting indeed, actually, they looked more towards wiring diagrams as far as usefulness. The notations were interesting as well for not containing as much information.
The circuit board was interesting as well, I am guessing that the squares with the triangle represented the transistors. Certainly a great way to keep information secret, don't you think??