FYI, until further instruction, I am ignoring all drawings except for needhelp3.pdf because I don't know the story behind them.
Still waiting for those limit switches to be added to needhelp3.
Please excuse me if I start probing into things which might seem a distraction from your specific question, but to be completely transparent, If I do this I'm trying to get a feel for the accuracy of needhelp3.pdf.
Getting started, it looks like your raise button does absolutely nothing and the raise relay coil is connected directly to +24V. Is this the case? If so, the raise button should do nothing, and it should be impossible for you to ever lower the saw since the raise and lower relays appear to be electrically interlocked.
What is the line coming out the left side of the selenium rectifier? another 0V line?
What is the line coming out the bottom side of the selenium rectifier? another +24V line? a -24V line?
Where does the +24v to all the buttons come from?
I think that the raise and lower functions were momentary functions and someone had the bright idea to try and make them latching functions. They got half way through and lost track or got confused, and couldn't get it back to the original setup OR make it latching so they effectively "ruined" the saw so they sold it to you.
Still waiting for those limit switches to be added to needhelp3.
Please excuse me if I start probing into things which might seem a distraction from your specific question, but to be completely transparent, If I do this I'm trying to get a feel for the accuracy of needhelp3.pdf.
Getting started, it looks like your raise button does absolutely nothing and the raise relay coil is connected directly to +24V. Is this the case? If so, the raise button should do nothing, and it should be impossible for you to ever lower the saw since the raise and lower relays appear to be electrically interlocked.
What is the line coming out the left side of the selenium rectifier? another 0V line?
What is the line coming out the bottom side of the selenium rectifier? another +24V line? a -24V line?
Where does the +24v to all the buttons come from?
I disagree with your statement in bold. I do believe that, if there were no button installed to stop a downward stroke, then the only possibility is that in the original configuration, the operator was required to hold the Down button in. As a matter of fact, I would think that it should be a safety requirement to have it this way, in case for any reason (including, but not limited to the operator being pulled into the saw) the operator releases the down button, it stops going down. I would also expect the saw motor on function to not be a latching circuit for the same reason. Look at other saws on the market, especially the large chop saws, have a trigger which must be held in for the operator to run it.Is the operator supposed to hold the button until it reaches the correct height, then release it? That would make a little more sense to me. The contactor wouldn't need to latch in that case.
For the lower solenoid its a different operation. You wouldn't expect the operator to hold the button while the saw was cutting. That contactor needs to latch but also needs a way to unlatch. There is no direct switch to disengage the contactor for the lower solenoid either.
I think that the raise and lower functions were momentary functions and someone had the bright idea to try and make them latching functions. They got half way through and lost track or got confused, and couldn't get it back to the original setup OR make it latching so they effectively "ruined" the saw so they sold it to you.