[Larken]

I will be releasing a higher power version of the Viper in a few months. This will be aimed at larger machine retrofits.

[maquiza]

Great News! Please keep us inform.

[Tig]

Hi, How are the bigger 250V 40A Vipers coming along. How will they compare with the Rutex R2020.
Thanks.

[Larken]

Its a few weeks away. It will be for larger size 42 motors that have a high braking current. Also i'm improving the HV stepdown voltage regulator that has been strained and voltages over 130V.

[rokag3]

hi,
i have a
180V DC
6 A
2 HP
4000 rpm
it work fine but fried my uhu board at 135V
can i use the viper 200 or should i wait for the viper 250?
rutex 2020 was the solution for those big motors but not in busisness any more
so you are the last hope for affordable big drivers
i am a bit tired to wait so, if the Viper200 make the job i buy

[Larken]

I've rated the Viper 200 at 180 volts @ 25 amps. and my Viper 100 is 90 volts @ 15 amps.

I can make a custom 250 volt drive if you really need it though. Have't seen many DC servo's run that high.

I probably won't be rating the drive above 25 amps though even though the mosfets are rated at 60 amps. The 25 amp drive can see currents much above that when operating during hard decel and accidental abuse. I'm using TO-247 size mosfets on the Viper 200 and these seem much tougher than the TO-220 mosfets, and run very cool.

[rokag3]

hi Mr Larken,

well if it make the job it's ok
it' a dc motor made for tunturi ,it turn smooth with a battery of 1.5v and weight 8kg i want to use it for a lathe to replace a 550w ac motor
and be able to run my lathe without changing pulley , be able to make screw
for this job i do not need huge acceleration nor deceleration but if i can drive a break it will be nice (i have plenty solenoid 24V from xerox photocopier)
any way
if you think i have to go for 250V give me the price
but i want something that work .

[jeep534]

I will be releasing a higher power version of the Viper in a few months. This will be aimed at larger machine retrofits.

well, status, updated pictures, and will the overall size change.

Happy Hunting
archie =)=) =)

[Larken]

My viper 200 pretty much uses the largest descreet mosfets, (250volt, 60amp IRFP 4232) so to make a bigger drive, im looking into it being an SCR drive. Its still a ways away.

I am going to have a 0-10V servo S/D board (like the pixie) soon though so you can use the existing 0-10V drives .

[Ben Olson]

how soon will the 10v step/direction ( Lixie? ) boards be available?

[routerman]

bump...

[Larken]

I will be working on a higher current version using the viper 200. A customer is sending me a very larger servo off a huge mill to test with.
I plan on putting high power devices under the board mounted on a heatsink.
Should be interesting.

[Ben Olson]

Any news on the 10v to Step/direction boards?

[Larken]

If you want i can convert a Viper75 to +- 10Volt output to try ? I will have to add a simple a D-A converter and opamp. You can be the ginnea pig.
Email me. [email protected]

[cowpoke]

Current status of the high voltage/current Viper drive?

[Larken]

It will be available soon, for the really huge machining centers and lathes with > 3 Kw -10 Kw DC servo motors.
The Viper 400 will be based on the V200 board with IGBT modules under it. It will run 350 volts @ 50 amps (100 amps peak). It will be in the $400-$500 range though since those modules arn't cheap and there is a lot of hand assembly.

The guy who was supposed to send me a big motor , changed his mind, so if anyone wants to send me a motor to test, that would speed things up.

Larry K

[cowpoke]

I have a large motor I could donate but it does not have a built in encoder if that would help.

[D.L]

Hi Larken,
It would seem your drives are the choice for the large brush users.
With AC becoming the industry standard I could imagine surplus DC brushless becoming more abundent for the home user type setup.
I found 3 large 175vdc motors dumped in a factory estate and I could well imagine this story becoming more common. (2 serviceable, one basketcase)

What would you imagine is the upper limit of a single phase powered setup?
The viper 200 looks like it will do anything single phase can keep up with.

Any thoughts?

Thanks, Dirk.

[Larken]

170 volts (rectified 120) is the limit i recommend. Its mostly the voltage regulator that dissipates the most heat with a high voltage. Its dropping 170 down to 16, then to 5, so its running a bit hot. You should fan cool the board over 140 volts. The IRFP4232 power mosfets are rated at 250 volts.

High voltage motors should be checked for any insulation leakage or any shorts to the frame (metal chips etc) as these can blow the drives. Bad things happen very fast at 170 volts, not like low voltage drives.

Its also very important to have every metal part grounded (viper mounting plate, motor) to prevent injury. Never have a motor on the bench unless there is a ground wire to the case.

I have a large motor I could donate but it does not have a built in encoder if that would help.

How much does it weigh, and whats the voltage and current rating ?
Can you post a picture ?

[D.L]

Thanks Larken, as soon as i get another job I'll be buying a Viper200.
I meant brush, not brushless in my typing haste.

40amp 250 volt, whoa, serious torque. (train motor?)