Doosan DNM6700 TSC MALFUNCTION

[Rex_Banner]

Machine is about a year old, just doing short run parts. Now we are running a larger order of thousands of parts, and using through spindle coolant. 2 times now, TSC failed to come on, and the machine did not stop!! When it happens the light on the console will flash, and if I hit that button it will blow a bunch of air, and then trickle out, but it will stop after about 10 seconds. I have to power off the machine to get the coolant back on.

Shouldn't the machine stop when the TSC errors out?? I have seen the same thing on a Haas and it would stop.

It looks like there is a line filter in the tank, and I told the higher ups that it should be cleaned.

Has anyone else had this problem before??

Thank you for your time!!

 

[LockNut]

There might be a keep relay that turns on or off the TSC flow sensor. On our DNM5700 it is K11.4. Might be different on yours. Check the blue book that came with the machine. It should be kept in the door of the electrical cabinet.
This may also be caused by low coolant levels too.

 

[Rex_Banner]

Thanks for your input, as for the coolant flow issue, I discovered there is a valve on the bottom of the cyclone filter, and that valve needs to be closed, mine was open, and the pressure is now at 20 bar, but I'm still concerned about the machine not stopping if there is a TSC error.

I will check that relay you mentioned

 

[Djstorm100]

my machine does it to. Will run without tsc even though its called

 

[Rex_Banner]

Yeah and that's scary!! I have seen a Haas stop dead if the TSC fails, I would think there is a parameter. I really hope!!

 

[DouglasJRizzo]

The DNM won't stop if the coolant flow isn't up to par.
As long as the controller gets the confirmation that the M8/M7 signal has been sent to the pump(s), that's it.
While you're at it, check the level as well as for clogged screens.

 

[Djstorm100]

The DNM won't stop if the coolant flow isn't up to par.
As long as the controller gets the confirmation that the M8/M7 signal has been sent to the pump(s), that's it.
While you're at it, check the level as well as for clogged screens.

Sounds like a disaster waiting to happen though. At least on the haas it will alarm out because of pressure sensor not seeing TSC pressure.

 

[LockNut]

The DNM won't stop if the coolant flow isn't up to par.
As long as the controller gets the confirmation that the M8/M7 signal has been sent to the pump(s), that's it.
While you're at it, check the level as well as for clogged screens.

This is not the case. TSC has a flow sensor. It is really apparent when using tools with really small holes, you will get an alarm. This is why some people disable the flow sensor. There is also an M Code that will temporarily ignore the flow switch. M313 and M314 will turn off/on the flow sensor.

 

[Blaser Swisslube]

Machine is about a year old, just doing short run parts. Now we are running a larger order of thousands of parts, and using through spindle coolant. 2 times now, TSC failed to come on, and the machine did not stop!! When it happens the light on the console will flash, and if I hit that button it will blow a bunch of air, and then trickle out, but it will stop after about 10 seconds. I have to power off the machine to get the coolant back on.

Shouldn't the machine stop when the TSC errors out?? I have seen the same thing on a Haas and it would stop.

It looks like there is a line filter in the tank, and I told the higher ups that it should be cleaned.

Has anyone else had this problem before??

Thank you for your time!!

If you haven't already, try to check your pump screens...could be packed with small chips.

 

[DouglasJRizzo]

This is not the case. TSC has a flow sensor. It is really apparent when using tools with really small holes, you will get an alarm. This is why some people disable the flow sensor. There is also an M Code that will temporarily ignore the flow switch. M313 and M314 will turn off/on the flow sensor.

Cool! Different than the one I was on, although that was a while ago and may have been altered.

 

[DouglasJRizzo]

Sounds like a disaster waiting to happen though. At least on the haas it will alarm out because of pressure sensor not seeing TSC pressure.

According to LockNut, there is a flow sensor, although some disable it. That may have been the case on the machine I was working on.

 

[Djstorm100]

My AE at Ellison mention some time ago about adding a pressure sensor. Going by his remarks there is no pressure sensor though.

 

[DouglasJRizzo]

My AE at Ellison mention some time ago about adding a pressure sensor. Going by his remarks there is no pressure sensor though.

That was most likely the case with the machine I was on, some time ago.

 

[LockNut]

My AE at Ellison mention some time ago about adding a pressure sensor. Going by his remarks there is no pressure sensor though.

There is no "pressure" sensor. There is a flow sensor, as in GPM. It caused issues when using really small drills with really small coolant holes. It would trigger the flow sensor for lack of flow, based on the setting of the flow switch. There is an M Code for temporary ignoring of the switch. Most people did not know this so they disabled the flow sensor with the keep relay.

 

[LockNut]

Cool! Different than the one I was on, although that was a while ago and may have been altered.

Yeah Doug, a lot has happened since you were here.

 

[Djstorm100]

There is no "pressure" sensor. There is a flow sensor, as in GPM. It caused issues when using really small drills with really small coolant holes. It would trigger the flow sensor for lack of flow, based on the setting of the flow switch. There is an M Code for temporary ignoring of the switch. Most people did not know this so they disabled the flow sensor with the keep relay.

So machines have this keeper relay able or disabled now? How would I check?

 

[LockNut]

So machines have this keeper relay able or disabled now? How would I check?

Check in the Blue Book that came with the machine. It has all of the keep relays listed for that machine. It also has all of the parameters and such. This depends on the age of the machine too. Only in the last year or two did we start putting the flow sensors on ALL mills.

 

[Penta_machinist]

Is there anyway to change the flow that will trigger the alarm once the parameter is turned on?

 

[LockNut]

Is there anyway to change the flow that will trigger the alarm once the parameter is turned on?

Yes there is but it's on the flow sensor itself. If you change it, you most likely will be changing it quite frequently to suit your needs. I would avoid this if you can. I just use the M Code for small drills and endmills to ignore the sensor. If I remember correctly, drills with holes smaller than about .060" usually pose a problem, I use the M Code for those and smaller. Honestly, it's kind of a guessing game until you find the sweet spot. The purpose of the sensor is in case your coolant gets too low and you get no flow at all. This whole thing works better with high pressure coolant.

Paul

 

[CGornet]

Has happened to me a few times. Generally, it is either the cyclonic filter being clogged, or the coolant level not being high enough. Sometimes the coolant level is overlooked because it has happened to me when the tank was over 1/2 full.