Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: NormB on January 22, 2010, 07:34:59 PM
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With the new g540 and new motors steppers they seem warm to the touvh is this normal? I never noticed this before with the old system is why I ask.
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They get warm just sitting there not moving at all.
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Steppers do get hot and will get warm when sitting as they are holding position. I think the Geckos will reduce current when sitting idle so that they dont get too hot but a stepper will handle heat that you wont LOL
Just need to check you have the correct current limiting resistor on your geckos.
Hood
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This is a new controller I purchased, I just got tired of all the trouble I was having with the other controller. I installed this tonight ran a program no problem so I hope I am out of the woods now. This g540 is all new and new motors well they need to be broken in I suppose.
I am still playing with the motor tuning not sure where I should be on that one. I am trying to find that place where things are running smooth without all the jerking and squealing. I am close now but still working on that one.
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Just make sure you have the correct value resistor fitted and your motors will be fine :)
Hood
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another thing I noticed tonight, with the old controller and the drives on I could turn the screw by hand, you won't tun this one. Now way you will move that it's really locked.
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Aren't the resistors in the controller? This is a turn key controller complete with motors. I am not sure where to look for that.
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Not sure, if its turnkey then they should be, where did you buy it from?
Hood
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It was a guy in NJ who makes CNC mills etc. the name is Deepgroove1 This is the Web Page http://www.deepgroove1.com/
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The current set resistors should be soldered to the DB9 that plugs into the drive. They are not internal as Gecko has no idea what motors you will use. You can remove the hood on the power cables and see if it's in there.
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To paraphrase Hood and rrc1962 - RTFM ;D
2) MOTOR CABLES: The motors connect to the G540 via male DB9 connectors. The four motor wires
connect to pins 6 and 7 for one motor winding, pins 8 and 9 for the other motor winding. The current
set resistor connects to pins 1 and 5. The motor cable should be a 4-conductor cable and it can be
shielded or unshielded. If a shielded cable is used, connect the shield to either pin 2, 3 or 4. Pins 2, 3 and
4 connect to ground inside the G540.
3) CURRENT SET RESISTORS: The current set resistor programs the axis drive current (0 to 3.5A) to
match the rated phase current of the motor being used with the axis. Each axis requires a current set
resistor. The resistor can be from 1/10 W to 1/2 W in size and 1% to 5% tolerance. The current set
equals 1,000 Ohms per Amp of motor current. Example: A 3.3A per phase motor requires a 3.3K resistor;
a 1.5A per phase motor requires a 1.5K resistor.
Cheers
Ian