I had to save this puppy FP2NC

Basically, control switches on normally, but all machine interface is dead/inoperational, including the DRO.
The "STEUERSPANNUNG FUER RELAIS FEHLT", what usually appears after you clear the "STROMUNTERBRECHUNG" is missing, too.
Goes directly to DRO, which is not responding.

Current assumption, either broken/wrong wiring on E-stop or toasted PL110B board in electrical wardrobe.

Could you please pull J10 connector on your PL110 board and see, if your machine also starts without "STEUERSPANNUNG FUER RELAIS FEHLT" message?

Martin P said:

Yeah, but what takes one button turn and one button push on a Dialog 4 control takes 5 button pushes and a keypad entry on the HDH.

Click to expand...

were those not designed with tool room sort of use in mind specifically and for particular model of machines also?
and I can't really think of anything annoying about using the control, except 2 things maybe, Fehlmann doesn't have a spindle direction selector, it has only spindle start M3 button and spindle stop, to use left handed drill with it I must write a program with M4 in it, there is no other way... on Mikron, I can't do a tool change while in handwheel mode... which is quite annoying having to switch out/in, also having to press a button to enable tool change mode, then press the tool release button to actually release the tool, why not integrate that into 1 button is beyond me, but all these things are machine builder decisions, not HH mandates

OK will try, but if this kills my mavchine or deletes parameters or similar, I will have to send you a letter bomb.

DeadMahoDude said:

Basically, control switches on normally, but all machine interface is dead/inoperational, including the DRO.
The "STEUERSPANNUNG FUER RELAIS FEHLT", what usually appears after you clear the "STROMUNTERBRECHUNG" is missing, too.
Goes directly to DRO, which is not responding.

Current assumption, either broken/wrong wiring on E-stop or toasted PL110B board in electrical wardrobe.

Could you please pull J10 connector on your PL110 board and see, if your machine also starts without "STEUERSPANNUNG FUER RELAIS FEHLT" message?

Click to expand...

you might want to check if the PLC program in the EPROM is actually readable, since without it it won't do anything and behave in the way you have it in the video

to check if EPROM is actually readable - when you're in the manual mode (you call it DRO mode), press MOD, arrow up, code:951026 to get to PLC options, press the edit program button (1. in the picture) to open the PLC editor, it shows RAM content at first, most likely will be completely empty, that is fine, then press Qdef button (red circle in picture), it will ask to copy the program from EPROM to RAM, press ENT, it should now copy the program from EPROM to RAM - now, does something change on the screen? (arrows up/down to scroll through the program) When I just checked my 355, once I open the editor, all lines are "NOP", after copying from EPROM it should show the actual program

doing any of this doesn't mess up anything on the control, you can erase that PLC program from RAM if need be, and as long as the MP77 is 1, it will ignore the program in the ram anyway

Well, have several really dead axis end switches in the E-stop chain, guess it was too much for the control and it quit without any error message.

Really dead, not only stuck from oil/coolant crap but no contact internally dead.
Have to remove and bath them in alcohol/light oil, I guess...

EPROM dump from the TNC155, in case anyone needs it:

it wouldn't be a reliable CNC control if it would be confused by some dead end switches in a simple series circuit or two, and that wouldn't make it behave like it does in the video

Cleaned all end switches, E-Stop chain is continuous now, problem still there, as somewhat expected.
PLC code gets loaded from EPROM as well, reloaded it as described above, didn't change a thing.
Basically gets stuck in first branch, 24V is not present at J4/4 on PL-110B "P0" board.
"STEUERSPANNUNG FUER RELAIS FEHLT" never appears, so no control/machine interaction possible.


Can someone please pull the 25pin J10 connector from PL-110B board and see, if it behaves the same as my machine then?
Then I know whether problem is on the side of PL-110B board, that had repairs/smoked capacitors previously or if something is f**''d inside the Heidenhain itself (bad PLC code, bad PSU, whatever...)

OK, I pulled the J10 connector and started up.
It will do the "Speicher Test" as normal.
Then will say "Stromunterbrechung".
Then I press CE and it go to "Steuerspannung für Relais fehlt".
If I then press the start button nothing will happen. Also no mode change possible.

I put the connector back in, restarted all normal.
5 min later the machine quit as I was trying to figure out the spendle brake. It is not running now. Surely unrelated.

Thanks!

All 3 PL110 cards that I have here, appear to be dead when installed, outputs are all stuck at 0V.
Will build a sniffing adapter for J10 cable, so I can connect HP16500C logic analyzer in between and see, if anything happens on J10 at all, when starting the machine.
I'm quite certain something is broken with the PLC or all 3 PL110 cards have blown up.
I somewhat hope for broken bus driver chip or similar on TNC155 side.

"Power ON" button on control is unrelated to PLC.
PLC needs to switch a relay in between E-Stop chain and Power ON button, so that "Power ON" relays can latch in ON state, when pressing "Power ON" button.
Since all outputs are of PLC are 0V, "Power ON" button is not conncted to E-Stop chain.

3 PLC boards bad and behave exactly the same? what would the possibility of that be...

I looked in the TNC155 service manual, and it basically says that in this case to send the TNC to them for repairs... Service manual (available on Heidenhain site, at least was a while ago when I downloaded the 155 related PDFs) lists 2 power supply board layouts for TNC, would be a good idea to start there, verify that all the voltages are there, then there was a block diagram showing optocouplers on the PLC interface on the TNC side

the Fehlmann I have that has the 155, isn't connected to power right now, and it will be a hassle to connect it, it is packed up in storage, but if everything falls apart, I can do it, disconnect the PL110, and see if it behaves like your machine does, at last check if reads scales when the PLC is not connected, since I know mine is fully functional

Hello, everyone,

I have a small TNC150Q test stand for my old MIKRON WF3DCM.
The PL110B is also installed as a power board in this.
If J10 is not connected, after pressing CE, the error message "Control voltage for relay is missing" appears.

???????
No!

That message appears when all is connected.
Literally first page of the HDH manual.
In German: 'Steuerspannung für Relais fehlt'

Martin P said:

Yeah, but what takes one button turn and one button push on a Dialog 4 control takes 5 button pushes and a keypad entry on the HDH.

Click to expand...

Hi Martin,
i know what you did today....

Cheers