CNCzone.com-The Largest Machinist Community on the net!



Home Page Mark Forums Read Today's Posts My Replies Classifieds Reviews Photo Gallery Web Links Share Files Advertise With Us Ad List
Go Back   CNCzone.com-The Largest Machinist Community on the net! > Electronics > Rutex Products > Servo Drives


Servo Drives Discuss all Rutex servo drives and get direct support!


Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Ban this user!
Old 04-19-2005, 08:45 PM
 
Join Date: Feb 2004
Location: usa
Age: 40
Posts: 38
roonster71 is on a distinguished road
power supply?????

what size power supply should i use for a rutex 990h (100v 20a max)

running 3 of these servo's without blowing my drives
and wondering if i need three power supply's or one?

Continuous Stall Torque (Oz-In) 352
Peak Torque (Oz-In) 1760
Nominal Terminal Voltage (V) 120
Nominal Operating Speed (RPM) 1750

Rotor Inertia (Oz-In-s2) 0.068
Damping Constant (Oz-In/kRPM) 1.8
Thermal Resistance (C/Watt) 1.6
Maximum Armature Temperature (C) 155
Maximum Friction Torque (Oz-In) 8.0
Terminal Resistance, Nominal (Ohms) 4.3
Weight (lbs) 8.0

Torque Constant, kt (lb-In/Amp) 5.5
Back EMF Constant, ke (V/kRPM) 62
Maximum Continuous Current (A) 4.0
Maximum Peak Current (A) 20.0

thanks in advance
Tweet this Post!Share on Facebook
Reply With Quote

  #2   Ban this user!
Old 04-19-2005, 10:22 PM
 
Join Date: Aug 2004
Location: US
Posts: 2,782
ViperTX is on a distinguished road

Yikes, check with Rutex....I'm worried about your Back EMF rating....for short durations at max rpm it will exceed the voltage rating of the FETs. I don't know if Rutex has a maximum temp. cutoff to protect the driver.

And if you're planning on running at the Terminal Voltage...you got more problems.
Tweet this Post!Share on Facebook
Reply With Quote

  #3   Ban this user!
Old 04-19-2005, 10:50 PM
 
Join Date: Feb 2004
Location: usa
Age: 40
Posts: 38
roonster71 is on a distinguished road

Originally Posted by ViperTX
Yikes, check with Rutex....I'm worried about your Back EMF rating....for short durations at max rpm it will exceed the voltage rating of the FETs. I don't know if Rutex has a maximum temp. cutoff to protect the driver.

And if you're planning on running at the Terminal Voltage...you got more problems.
I'm not planning to run at full voltage people say these run fine on a geko with 80vdc
of couse you never know till you try it...... this is the first time ive ever used a servo untill now ive only run a stepper controller 24v 2a xylotex on a sherline mill that ive out grown maybe i should have got the servo first then the drive??? (chicken before the egg )
Tweet this Post!Share on Facebook
Reply With Quote

  #4   Ban this user!
Old 04-25-2005, 03:57 PM
 
Join Date: Oct 2003
Location: United States
Posts: 159
rutexus is on a distinguished road

Roonster,

I have been away for a couple of days with my boys on an international robotics meet. Back now to offer usual support.

I run very similar motors on the R990H with no troubles. I run them at 85 Vdc. This gives me a margin for different customer's line voltages. My motor terminal voltage is 140 vdc.

I use an 8 amp power supply for two axis. I think you would do fine with 12 amp.

Amveco, in Texas is my latest supplier. I pay 85.00 for a 10 amp transformer plus shipping.

I would use one common power supply for all axis (The 12 amp one). You will need the transformer, a bridge rectifier, and around 22,000 of filter caps, rated at at least 100 working vdc. Keep the filter caps within 18'' of the drive.

I have also configured a similar motor, with 26 inch lbs of torque with the R990H drives. With a 1 ohm load resistor in series with the motor, I measure 18 volts over the resistor at the instant that the motor stops. At this point the drive is turned off, and what I am seeing is the BEMF. In other words, at that point the motor is acting as a generator, and it is generating 18 amps of current (18 volts/1 ohm= 18 amps). I leave the resistor in the motor circuit, and also fuse it.

We do not notice any decrease in performance as a result of the resistor, believe it or not, and it does allow me to use a motor that is priced well, and normally in stock at Servo Dynamics.

I hope this helps.

Tom Eldredge
__________________
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Tweet this Post!Share on Facebook
Reply With Quote

  #5   Ban this user!
Old 05-04-2005, 02:20 AM
 
Join Date: Feb 2004
Location: usa
Age: 40
Posts: 38
roonster71 is on a distinguished road

Originally Posted by rutexus
Roonster,

I have been away for a couple of days with my boys on an international robotics meet. Back now to offer usual support.

I run very similar motors on the R990H with no troubles. I run them at 85 Vdc. This gives me a margin for different customer's line voltages. My motor terminal voltage is 140 vdc.

I use an 8 amp power supply for two axis. I think you would do fine with 12 amp.

Amveco, in Texas is my latest supplier. I pay 85.00 for a 10 amp transformer plus shipping.

I would use one common power supply for all axis (The 12 amp one). You will need the transformer, a bridge rectifier, and around 22,000 of filter caps, rated at at least 100 working vdc. Keep the filter caps within 18'' of the drive.

I have also configured a similar motor, with 26 inch lbs of torque with the R990H drives. With a 1 ohm load resistor in series with the motor, I measure 18 volts over the resistor at the instant that the motor stops. At this point the drive is turned off, and what I am seeing is the BEMF. In other words, at that point the motor is acting as a generator, and it is generating 18 amps of current (18 volts/1 ohm= 18 amps). I leave the resistor in the motor circuit, and also fuse it.

We do not notice any decrease in performance as a result of the resistor, believe it or not, and it does allow me to use a motor that is priced well, and normally in stock at Servo Dynamics.

I hope this helps.

Tom Eldredge
What should the ac voltage out be on the tranformer (secondary?) to make 85vdc 12amp after bridge rectifier and cap????

thanks
Tweet this Post!Share on Facebook
Reply With Quote

Sponsored Links
  #6   Ban this user!
Old 05-04-2005, 02:55 AM
 
Join Date: Jan 2005
Location: Missouri
Posts: 746
2muchstuff is on a distinguished road

Coming out of the transformer you should have 60 volts AC, (85 / 1.414= 60).
__________________
If it's not nailed down, it's mine.
If I can pry it loose, it's not nailed down.
Tweet this Post!Share on Facebook
Reply With Quote

  #7   Ban this user!
Old 05-04-2005, 01:07 PM
 
Join Date: Oct 2003
Location: United States
Posts: 159
rutexus is on a distinguished road

Yes, the 60 volts DC is correct. Transformers are rated at a certain amperage. If you underload them, the voltage will be slightly higher than their specified rating, but not too much higher. I use a 59 VDC, 10 amp transformer at 125 vac and get 85 vdc. 60 vdc is fine.

Tom Eldredge
Rutex LLC
__________________
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Tweet this Post!Share on Facebook
Reply With Quote

  #8   Ban this user!
Old 05-04-2005, 08:00 PM
 
Join Date: Feb 2004
Location: usa
Age: 40
Posts: 38
roonster71 is on a distinguished road

Originally Posted by rutexus
Roonster,

I have been away for a couple of days with my boys on an international robotics meet. Back now to offer usual support.

I run very similar motors on the R990H with no troubles. I run them at 85 Vdc. This gives me a margin for different customer's line voltages. My motor terminal voltage is 140 vdc.

I use an 8 amp power supply for two axis. I think you would do fine with 12 amp.

Amveco, in Texas is my latest supplier. I pay 85.00 for a 10 amp transformer plus shipping.

I would use one common power supply for all axis (The 12 amp one). You will need the transformer, a bridge rectifier, and around 22,000 of filter caps, rated at at least 100 working vdc. Keep the filter caps within 18'' of the drive.

I have also configured a similar motor, with 26 inch lbs of torque with the R990H drives. With a 1 ohm load resistor in series with the motor, I measure 18 volts over the resistor at the instant that the motor stops. At this point the drive is turned off, and what I am seeing is the BEMF. In other words, at that point the motor is acting as a generator, and it is generating 18 amps of current (18 volts/1 ohm= 18 amps). I leave the resistor in the motor circuit, and also fuse it.

We do not notice any decrease in performance as a result of the resistor, believe it or not, and it does allow me to use a motor that is priced well, and normally in stock at Servo Dynamics.

I hope this helps.

Tom Eldredge
do you have the part number for the Amveco 10 amp transformer???

thanks
Tweet this Post!Share on Facebook
Reply With Quote

  #9   Ban this user!
Old 05-05-2005, 08:18 PM
 
Join Date: Oct 2003
Location: United States
Posts: 159
rutexus is on a distinguished road
Amveco transformers

The part number for the AMVECO transformer:

10.8 amps, 60 volts: AA5650-2030 $82.00 (typically for 2 axis of 22 inch lb motor)

13.2 amps, 60 volts: AA5790-2030 $84.00

16.7 amps, 60 volts: AA5000-2030 $98.00

They might also have some small "copper charges" like $3.00-$5.00

I realized after I got these part numbers, that AMVECO will only sell to oems and resellers.

If anyone wants me to order one for them, I'll mark it up 13% and have it drop shipped to you. I won't say I'll always do this, but I'm willing to try it.
I'll also charge modestly for the shipping.

The 13% will cover my credit card fees and administrative costs.

Tom Eldredge,
Rutex LLC
__________________
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Tweet this Post!Share on Facebook
Reply With Quote

  #10  
Old 05-06-2005, 09:33 AM
Gold Member
 
Join Date: Dec 2004
Location: Newtown, CT, USA
Age: 67
Posts: 511
lerman is on a distinguished road

www.avellindberg.com has toroid transformers for excellent prices.

My 1200VA toroid transformer was about $80.

(If you talk to Melanie, tell her Ken from Newtown recommended them.)

Ken
__________________
Kenneth Lerman
55 Main Street
Newtown, CT 06470
Tweet this Post!Share on Facebook
Reply With Quote

Sponsored Links
  #11   Ban this user!
Old 05-09-2005, 08:55 PM
 
Join Date: Oct 2003
Location: United States
Posts: 159
rutexus is on a distinguished road
Toroidal transformer lead

Thank you for the lead. It looks like a good one. I'll check it out!

Tom Eldredge
Rutex, LLC
__________________
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Tweet this Post!Share on Facebook
Reply With Quote

  #12   Ban this user!
Old 06-10-2005, 01:01 AM
 
Join Date: Feb 2004
Location: usa
Age: 40
Posts: 38
roonster71 is on a distinguished road
Unhappy transformer trouble?

hi all thanks so much for the help
i order a power supply kit so every thing would come out right (i thought) well any way i got a transformer and a cap and bridge rectifier and theristor and bleed resistor but i get 70vac out of the transformer and i messure 97~100vdc at the capacitor with no load on it. is this normal and will this work? should it be mesured under a load? i dont want to fry my drives!!!


thanks
roonster
Tweet this Post!Share on Facebook
Reply With Quote

Reply




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
How does a power supply work. ynneb DIY-CNC Router Table Machines 1 07-27-2011 10:40 AM
Diy Power Supply Choices berin DIY-CNC Router Table Machines 11 07-13-2005 04:47 PM
5 Volt Power Supply Tripping murphy625 General Electronics Discussion 13 02-27-2005 10:05 PM
Is this power supply rating adequate? jerryrigge General Electronics Discussion 3 11-25-2004 11:06 AM
Choosing a Power Supply for Retrofit? pfeist General Metal Working Machines 4 05-23-2004 11:36 PM




All times are GMT -5. The time now is 02:47 PM.





Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2012, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO
Template-Modifications by TMS

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353