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sorry I'm not late to the party, that pic I posted was just from Phil who posted back in 2011, and if you are so Knowledgeable then why did you post the wrong schematic in the first place, Why are...

Also NOTE: as I stated before you can request the Braking option to be added by HuanYang


Question:
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that Schematic is no help at all and not even related to this Thread, I'm sure you will find this more helpful.

http://www.cnczone.com/forums/attachment.php?attachmentid=383208&stc=1

unterhaus ... that is correct there are no pads for the Zener Placement on the Braking IGBT they need to be soldered direct to the IGBT pin pads, they connect the same way as on the schematic of the...

ok first off to Get a unit that has the Brake option installed one needs to contact the HY reps and request this feature at either this website Huanyang Electrical Co Ltd - China Exporter,...

it is in Fact called an IGBT an IGBT is simply an Isolated Gate Bipolar Transistor and yes the Circuit it's being used in is called a Chopper, however many VFD don't use IGBT in the Output Inverter...

It looks to me like he has posted the 2.2KW units and the final one he posted is the HY Clone .. all the New Cheap HY clones do not have provisions on the PCB to add Braking Components, The actual HY...

Mactec54 we are talking about the Missing IGBT's in the HY VFD's you only get Dynamic Braking if you order the unit with this option, IF you don't have the option then you need to add parts to the...

And just a Note: the Torque specs for tightening the screws on the FGH60N60SMD TO-247 IGBT is 10 in/lbs Max.
also I might add that the TLP701 is a medium current device and the TLP701AF is a Small...

you also need to add D1 and a pair of 18 Volt zeners across the Gate and Emitter of the new IGBT that you add, these components are for Protection. and yes they work fine

EDIT: on the 4KW units...

Too funny, I haven't posted in a while and was just searching the 4KW HY units HY04D023B and I come across my old post, I just picked up 4 of these dirt cheap off FleaBay and need to convert them,...

ya that Motor is rated 3000 RPM.... 6000 MAX

unfortunately the MT series is obsolete now but many companies still claim to repair them.

a down and Dirty way to get a Cheap High Amp Source is to use ATX Puter Power Supplies... you can series connect them to increase Voltage too.
Modding the AT or ATX supplies is simple and cheap too....

From Servo Motor Disassembly | Servo Motor Magnetization

"First, any time a motor is disassembled, there is a high probability that the magnets will be discharged to a point where the torque will...

Ya I thought of that too, However he said he got another Stepper and it works fine....... so it don't seem like that is the issue.....

Kennedyl said:
"I picked up a stepper motor requiring 5v...

ok the Rated voltage is 5 volts the current 1 Amp, Resistance is 5 Ohms, and Inductance is 8 mH.

at 24 volts it should be running fine up to 7.5 RPS with a wattage of 24

is that a New Motor or...

I looked at the link in the first post but couldn't find any specs on the motor that they use with these multi port valves, if we knew the part number or model number of the motor then I could tell...

"It recommends 2.4A and 24v to drive (it's a pretty beefy motor, from what I can tell)"

is that the stepper motor Rating ??

if it is you won't drive it with 30 volts.

I agree there, however ya don't need or want micro-stepping, all depends on what ya want to do, actually if ya searched there are hundreds of Stepper Driver ICs on the market.

Sure you can get them from Dan Foss, or WW Grainger, also WEG makes them too

There is no real reason, in fact it's done with other driver IC's all the time, in fact you could do the same thing with the TA8435H, if I was going to drive a stepper that needed 8 amps with the...

yes that TA8435H is a better choice.

everything you need for making PCB for it you can find in the RAR file towards bottom of this web page....

Bipolar Stepper Motor Drive Circuit with TA8435...

ya I know Kiwi Club in Saigon, I was Jolly Green in the USAF back in that conflict, I was stationed at NKP Thailand ... flew combat SAR from there in HH-3E's also did LRP escorts


I know...

No you gave no Offense to me, I was just Curious .... I understand what you mean now, I just wasn't thinking in those terms... but ya unfortunately there is prejudice every where, well I know people...

Right the L297/ L298 is old and considered obsolete (so am I ) it will still drive a stepper motor if that is all you can get, and in it's time was not a bad choice..... I agree with you the TB6600HG...

I don't understand why you would say that ???

I understand this is not a Political Forum, but Facts are Facts, I'm sorry that a person that wants to try to build an open source Product cannot get...

maybe start here DIY Stepper Controller - Theory | PyroElectro - News, Projects & Tutorials

I understand... your original Schematic looks fine and should work, just try to make sure your PCB complies with the Data sheet, why not just Download the reprap 1.2 PCB file and use it ? I know they...

current limiting resistor in series with each winding is what I would do to control the current, but seems like going backwards from where you started..

First off what are you trying to use this...

you might want to read this Post ===>> http://www.cnczone.com/forums/showthread.php?69866-Problems%20with%20l297/l298%20based%20driver