-
22-06-2015 #101
Ah, sorry, mistook 'star point' as the star of a 3 phase system which is commonly earthed. Thanks, understood what you explained.
Out of interest, my drawings show the encoder shield only being attached on side and from speaking to a colleague this morning, that seems common practice (not to earth both sides of a shield). Would that be correct based on the collective experience here?
-
Out of interest, my drawings show the encoder shield only being attached on side and from speaking to a colleague this morning, that seems common practice (not to earth both sides of a shield). Would that be correct based on the collective experience here
-
The Following User Says Thank You to Clive S For This Useful Post:
-
22-06-2015 #103
Been away for the past week (my Golden wedding aniversary celebrations?), so sorry to be harping back to one of the non technical points. If your motor is marked as 230v 3 ph you can almost certainly run that coolant pump on single phase. Set the motor block connecters to Delta and either use a vfd or trick the motor to run in quasi 3 phase using a couple of caps. I have been running 3ph motors on 230v single phase for over 20 years and have never had any problems. It may be neccessary to use a separate switched cap for starting. If in any boubt, cap values etc. you can PM me. Your project is looking great. Well done. G.
-
22-06-2015 #104
-
22-06-2015 #105
You probably need a starting cap and a run cap. I actualy use a little timer that switches the start cap in for about one second, but the value of the caps you use is dependant on the motor power and if the motor is stating under load etc.. This system does not give a true 3ph, but a "quasi" 3ph, however for a coolant pump I am sure it that you will never know the difference. G.
-
22-06-2015 #106
What is the general consensus for wiring the Emergency Stop Relay. Keep this and its function (X Y Z extreme limits) or wire into the CS Labs directly and control from there?
Currently on activation it stops all drives, the spindle, the coolant pump and the ATC. It works and I am inclined to leave it in place as it is.
-
22-06-2015 #107Visit Us: www.automationshop.co.uk
-
The Following User Says Thank You to Gary For This Useful Post:
-
22-06-2015 #108
Well I don't agree with Killing power because Limit trip isn't an emergency situation it's a positional error so no need to Kill power just Halt movement. SO I would have limits tied to the Enable signal on drives and Inform the Controller of a Limit breach.
This way you don't damage expensive tooling when the spindle grinds to halt inside of material because power is Cut.! Machine is just halted from continuing and you can recovery safely by lifting tooling out of material then reversing off the Switches using tempory overide.
E-stop is an emergency situation to the operator and this is when you want power stopped but often positional errors ie: limits are not life threatening or dangerous to user only potential machine damage and the Limit's prevent this in most cases.
I did wounce upon time think "Kill every thing" but experience as taught me it's not needed where limits are concerened and it's more a pain in the arse, esp with short travels with fast accelerating machine and expensive at times with unnecessary tool damage.Last edited by JAZZCNC; 22-06-2015 at 10:52 PM.
-
23-06-2015 #109
One thing to be aware of when using this method, is you have to select caps that will provide reasonably matched voltages between the 3 legs when running. Achieving that with a small motor may prove to be a bit of a challenge, but you should benefit from the fact a coolant pump should have a reasonably steady load.
My main concern would be that the coolant pump motor is running near it's rated capacity, and when running from a static phase converter you risk burning out the motor if you try running it at high loads.Avoiding the rubbish customer service from AluminiumWarehouse since July '13.
-
23-06-2015 #110Visit Us: www.automationshop.co.uk
Thread Information
Users Browsing this Thread
There are currently 2 users browsing this thread. (0 members and 2 guests)
Similar Threads
-
FOR SALE: Denford Triac CNC PC
By ricey3 in forum Items For SaleReplies: 6Last Post: 10-01-2017, 01:39 PM -
Help Denford triac p.c.
By mikeulike in forum Denford MillsReplies: 3Last Post: 02-06-2015, 03:59 PM -
eBay: Denford Triac with Mach3 Conversion
By large519 in forum Items On eBay UKReplies: 0Last Post: 29-04-2015, 05:34 PM -
CONVERSION: Denford Triac Mach3 conversion
By rnr107 in forum Conversion Build LogsReplies: 11Last Post: 23-10-2014, 02:44 PM -
WANTED: Denford Triac
By edwardsjc in forum Items WantedReplies: 13Last Post: 20-08-2012, 08:17 AM
Bookmarks