Retrofitting a 1986 Maho MH400E

Thanks Hanno. I guess I'll have to run a clock over my table now to compare. Also have to clean out the coolant drain.

Mark

THX db1981 !!!!

I cleaned out the drain. There is is 90° elbow at the chip pan, which had clogged up with swarf. Not a great place for an elbow.



I was just going to start repeating Hanno's measurements, and was jogging down when the MAHO E-Stopped with MESA 7i84 communication errors.

CR2 on the 7i84 is not illuminated, so I have lost 5V VIN. The 5V PSU is working, so just need to shoot the wiring to find out where that pipe is blocked. Probably another elbow.
MRK

RotarySMP wrote: ........ so just need to shoot the wiring ...........

:woohoo: :woohoo: :woohoo:
Hang it, hang it !

Yesterday I received a present from Hanno. Much appreciated. He sent a ring light made specifically to fit the MAHO. It is fantastic, really bright. I shot some video and will edit it and up load it this week. Thanks Hanno.

Needed to lower the Z axis to install the light, which forced me to troubleshoot the Mesa 7i84 card not being powered fault. Turns out, the 5V rail was a red herring. I don't supply the 7i84 with 5V VIN. It makes it's own from 24V field power. The 24V input pins were reading 0v. The Mesa cards are hung on the one (of three) 24V rails which is always powered, not E-Stopped. That is between terminals 202 and 203.

Ignore that red circle.


A quick look showed cricuit breaker 6F2 popped. Shut down the machine, reset the breaker and powered back up. The CB popped again after about 20 seconds.

Since the system has worked for a year without problem, I thought about what I changed to screw it up (important aspect of troubleshooting that one). I'd added the tool length sensor, in that circuit, and it worked fine, but it's temorarily routed cable had got snagged at the end of the last job. So that tool length sensor got disconnected, the CB 6F2 reset, and it seems to be working normally again.

Maybe the bodged up wiring extension on the tool length sensor caused a short. I need to check into that, but was too busy installing the light yesterday to persue that.
Mark

Hi Mark
Good to hear the 24 volt supply problem was a easy one to find. An nice that Maho used many circuit breakers throughout the electrical system. Breakers are a expensive up front cost but sure cheap when time to localize a problem circuit is considered.

The return coolant plug --- I looked at those fabed up elbows on the clean out hatch of the MH600E and thought this must be a lowest bidder item. Time to fire up your foundry an pour a replacement.
Cheers
Bob