Help with stepper driver

[Den76]

Hi all!
Please sorry for my bad english, I'm from Russia.
I build router, and now i have choice problem. I have stepper motor FL86STH156-6204, and driver G210 7A, i try test its together, set current resistor 130kOhm it corresponds ~5A. Power voltage 60V. After 10-15 minutes the motor overheats. May be problem in the driver? May be it is necessary to increase power voltage? Or try to use another driver for example Q2HB88, or M880-FL http://www.fullingmotor.com/jsp/productshow.do?id=327

[RotarySMP]

Over heats? What do you mean by that? Too hot to touch? The rating for a stepper motor is basically the temperature rating of the windings. At full power, without any heatsinking, they generally run over 80C.

What is the inductance of that motor?

[Den76]

Originally Posted by RotarySMP Over heats? What do you mean by that? ? The rating for a stepper motor is basically the temperature rating of the windings. At full power, without any heatsinking, they generally run over 80C. What is the inductance of that motor?

Inductance 9mH. Yes, too hot to touch. But operating temperature no more 80°C?

[Jesse B]

Originally Posted by Den76 Inductance 9mH. Yes, too hot to touch. But operating temperature no more 80°C?

As long as they're still running, that's not too hot. Stepper motors can get very hot during operation, and 80°C is not unheard of for operating temperatures.

[RotarySMP]

From Geckos FAQ's

"To figure out what the maximum power supply voltage should be, use the following formula with the motor’s inductance in millihenries (mH) used for the L value.

32 * vL = VMAX"

9mH is not a particularly low inductance motor. 60V through a Gecko G201 should not be the problem.

What is the rated current per phase?
How many wires come out of the motor?

If 5A is the bipolar parallel rating, but you have connected the motor bipolar series, then you need to halve the driver current to 2.5A.

[RotarySMP]

From the Geckodrive FAQ's: "To figure out what the maximum power supply voltage should be, use the following formula with the motor’s inductance in millihenries (mH) used for the L value.

32 * vL = VMAX"

9mH is not a particularly low inductance motor.

What is the current rating per phase?
How many wires come out of the motor?

Could it be that you have connected a motor rated for 5A bipolar parallel, in series? In that case you should halve the current to 2.5A.

[Den76]

Originally Posted by RotarySMP From the Geckodrive FAQ's: "To figure out what the maximum power supply voltage should be, use the following formula with the motor’s inductance in millihenries (mH) used for the L value. 32 * vL = VMAX" 9mH is not a particularly low inductance motor. What is the current rating per phase? How many wires come out of the motor? Could it be that you have connected a motor rated for 5A bipolar parallel, in series? In that case you should .

The motor has 4 wires, 2 coil, it's bipolar. I'm jast read in a label of motor "1.8* 6,2A", so i should halve the current to ~3A? And set resistor 30kOhm?

[RotarySMP]

If it has only four wires, then it is bipolar parallel.

32 x sqrt 9 =96V so you are well under that limit with your 60V PSU.

How quickly do they heat up?
Are you running the axis nearly constantly?
Do you have auto current reduction set?

From the g201 manual
"OPTION JUMPER BLOCK
The G201 has four settable options. These options are enabled and disabled via the jumper block shunt settings. See the
diagram below for how to set the shunts. The four options are described below.
(1) AUTO CURRENT REDUCTION: The G201 reduces motor phase current to 33% of the set value when the motor is stopped.
If enabled, this reduction occurs 1 second after the last step pulse is sent to the drive. Auto current reduction can be enabled or disabled.

If you have Auto current reduction off, then you are pumping 5A through those motor all the time. The will heat up pretty fast. Turn it on, then the motor will be able to disapate more heat each time that axis is inactive.

[Den76]

Originally Posted by RotarySMP If it has only four wires, then it is bipolar parallel. 32 x sqrt 9 =96V so you are well under that limit with your 60V PSU. How quickly do they heat up? Are you running the axis nearly constantly? Do you have auto current reduction set? From the g201 manual "OPTION JUMPER BLOCK The G201 has four settable options. These options are enabled and disabled via the jumper block shunt settings. See the diagram below for how to set the shunts. The four options are described below. (1) AUTO CURRENT REDUCTION: The G201 reduces motor phase current to 33% of the set value when the motor is stopped. If enabled, this reduction occurs 1 second after the last step pulse is sent to the drive. Auto current reduction can be enabled or disabled. If you have Auto current reduction off, then you are pumping 5A through those motor all the time. The will heat up pretty fast. Turn it on, then the motor will be able to disapate more heat each time that axis is inactive.

Is it possible two jampers like on photo? First - "standby enable", second - "normal (default)" Or i damage driver

[RotarySMP]

Looking at the G201 manual, it is not clear to me whether this configuration of jumpers is allowed.

You should ask this question on the Geckodrive forum, then you will get an answer from Mariss, or Markus - the designer or his son.

[Den76]

Originally Posted by RotarySMP Looking at the G201 manual, it is not clear to me whether this configuration of jumpers is allowed. You should ask this question on the Geckodrive forum, then you will get an answer from Mariss, or Markus - the designer or his son.

thanks Mark