CNC_0076
OTHER: CNC Work Station
- Controller - Power Supply Unit (PSU)
Required Voltage and Amperage:
|
|
Voltage: |
Amperage: |
Power: Watts |
Notes: |
|
|
5 VDC |
|
|
Have CNC4PC 5VDC + 12VDC mini power supply. |
|
|
12 VDC |
|
|
Have " " " " |
|
|
24 VDC |
|
|
Have Omron S82K-10024 24VDC power supply |
|
|
48 VDC |
|
|
Have KEPCO 21311 48 VDC, 12 Amp power supply |
Existing Units:
KEPCO 21311, 48VDC, 12 Amp:
It is outputting 52.6VDC.
This is to high for three motors so I have put resistors in series with these motors. I do not think that this is an ideal solution.|
|
Capacitors: |
|
|
|
CORNELL DUBILIER MKTG |
|
|
|
117-0884 |
|
|
|
TYP DCM |
|
|
|
DCM403U060CF2B |
DCM???? |
|
|
40,000 μF 60vdc |
24,000 μF 60vdc |
|
|
75 VDC SURGE |
75 VDC SURGE |
|
|
658-9002-804 |
|
|
|
Transformers: |
|
|
|
Big one; |
Small one; |
|
|
100-2233 |
100-1502 |
|
|
6560 Probably |
76550 |
Bleed Resistor:
It does not appear to have a bleed resistor. In this state, it is taking 5 minutes for the voltage to drop from 52.6 VDC to 2.0 VDC. With a 10K (10W) resistor it is taking 4.5 minutes for the voltage to drop from 52.6 VDC to 2.0 VDC. With a 1K (10W) resistor it is taking 2.5 minutes for the voltage to drop from 52.6 VDC to 2.0 VDC and the resistor gets to hot to touch if left on. With a 1K (10W) resistor in line with the 'On' light it is taking 2.5 minutes for the voltage to drop from 52.6 VDC to 2.0 VDC, therefore this is the way to go.
Omron S82K-10024, 24VDC:
Not presently being used.
CNC4PC Mini Power Supply:
Using 2
Questions About Power Supply:
Linear vs. Switcher
Switching
The small size, lightweight and high efficiency of the switching products give them significant advantages over the linear technology products (Sola's SL and 81/83 series). Sola switching products provide well filtered and regulated DC of typically less than 1% deviation from the nominal output voltage.
Switch mode power supplies get hotter than you may think. They don't work like Traditional coil-wound power supplies. A precision timed switching power transistor that charges an inductor (very high current) for a brief amount of time, blocks the current for another brief amount of time then does it all over again. Its resistance causes quite a large amount of heat to be dissipated. In other words, it gets pretty hot. That's why quality high power PSUs need all the cooling they can get.
Linears are about 50% efficient while their switching counterparts are typically over 80% efficient. Switchers are light enough to mount on a DIN Rail, while only the smallest linears are capable of being securely mounted to a DIN Rail. Linears are still popular today because they do provide very tight regulation (<.01% typically), almost perfectly clean DC, fast transient response and their low component count helps provide a lower material cost for its user.
Linears are typically open frame because of the excessive heat dissipation from their low efficiency. Sola's industry standard linears, however, are available with optional covers for safety.
a toroidal coil wound
______________________________
It appears that the best route will be to by motors with a similar voltage, then purchase a custom Power Supply from
http://www.plitron.comPerhaps have a separate transformer outputting +5VDC and +12 VDC for Control with opto-isolaters and for very small motors on B and C-axis.
Not if B &/or C is to work via a Gecko, since it requires a minimum of 18 VDC.What is the maximum electrical power I can get from 1 or 2 household circuits? What is the input for 110V / 1 phase / 60 cycle and for 220V / 1 phase / 60 cycle ????
Would it be beneficial to have the power supply separate, in its own case?
Buy completely assembled power unit.
What is the story on the voltage differences between the Power unit, the Motors and the Fans. etc?
If there is to be a large voltage difference between the motors would it best to have 2 separate power supplies with different voltages?
Technical Information About the Power Supply:
Basic Power Supply Design by Campbell Designs I have hard copy.
Information on Power Supply:
To optimize the use of a servomotor it should receive a voltage that is close to it rated voltage, since the use of a lower voltage will reduce the motor's speed and power coming from it.
A note in the Gecko installation notes says that "The power supply voltage must be between 18 VDC and 80 VDC. The actual voltage should not be more than 5 volts higher than the motors rated voltage." Apparently, the 'rated voltage' that Gecko is talking about is the Maximum (ie. Terminal) voltage.
My question;
Does this imply that the small motors will have a low rated voltage and the medium motors should have a higher rated voltage. Therefore, does this mean that the power supply(ies) must provide a low VDC, a medium VDC, plus the 5VDC?Evodyne's reply; Well, the voltage rating is really due to the windings and wire gage and not so much the motors size. You could possibly have a 100V small motor and a 30V big motor. Or big and small motors with the same voltage ratings. But the answer to your last question is technically "yes"-if you want the best performance, you would want to match your supply voltages to the ratings of the motors.
Note that the power supply that is listed by Camtronics is 36V 25A @ $125 US. Camtronics' fan is 36V. Watts = Volts * Amps = 36 * 25 = 900W.
From Gecko:
http://www.geckodrive.com/ycom/documents/C163R16_power_supplies.pdf ~ Have hard copy."Switch mode power supplies get hotter than you may think. They don't work like Traditional coil-wound power supplies. A precision timed switching power transistor that charges an inductor (very high current) for a brief amount of time, blocks the current for another brief amount of time then does it all over again. Its resistance causes quite a large amount of heat to be dissipated. In other words, it gets pretty hot. That's why quality high power PSU (power supply unit)s need all the cooling they can get. CoolMax has implemented a 140mm on their Silent Cooling Fan Switching Power Supply to thoroughly cool off all of the hot power supply components."
A note at the Cantronic-cnc site. ~ 110 primary 36VDC at 25A ideal for the 600 oz in Ametch motors and others. This is probably dependant on the number and size of motors.
How is the router motor controlled?It appears that the rectifier increases the voltage to the servos by approximately 1.5.
_________
Excellent threads from CNCZone;
_________
Yes, the 50 VAC will become about 70 VDC after rectification. But you cannot get more power after the rectifier than before, so the 24 A @50 VAC will go down to something like 17 A @ 70 VDC.
50 VAC * 1.4 = 70 VDC.
24 AAC / 1.4 = 17 ADC.
It doesn't really matter much what voltage you give the motors, as long as you have the current limit set correctly on the Geckos and the voltage is not too far off.
Arvid
|
Originally Posted by DerekZahn Where would one get a power supply to use with these motors? |
Cheaper and easier to build your own, there are lots of links here [CNCzone] on power supply construction.
Al. The Man
_________
Here are some equations for selecting the transformer secondary voltage and the filter capacitor:
VRMS = 0.815 (VDC + 1.4) (assumes a full-wave bridge)
C = (DC current max.) /(60 x 2 x Vp-p ) where Vp-p is the ripple voltage under full load.
Complete Power Supplies:
Sola 28-2233 CVDC Rack Mount Power Supply 48VDC 10A New
Started eBay bid 99.00 US ~ No bids received.
Call Larry
Monday-Friday 8AM to 5PM PST 1-800-622-3434
Pacific Industrial Supply ~ Seattle
Components:
---------------------------
---------------------------
---------------------------
???
Details of Earlier (or Current) Camtronics Power Supply:
For pictures and more information see;
http://www.ktmarketing.com/CamtronicsServoCase.htm10 A 36 V power supply kit $75 (Individual component prices are listed after the item) consisting of:
Suppliers of Transformers:
Back to top | UniCopter Home Page | SynchroLite Home Page
Last Revised: May 22, 2007