Background
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General K40 DCPS design configurations
The LPS capacity:
- +24VDC @1amp
- +5VDC @ 1amp
I do not know the power requirements for K40+smoothie when under full dynamic load and therefore
I am skeptical that 24VDC@1 amp can run everything in this box at full power.
I have not measured the dynamic load so at this point it is a suspicion. Power budgeting & verification is on my list of to-do's.
What configuration to use?
How you wire the DC power depends on what your expected full load will be.Your full load includes DC current drawn from any/all of these:
- Smoothie
- Local Control panel (GLCD)
- Steppers
- Z table
- Finder LED
- DC pumps
DC Power Budget
Coming soonTypical configurations
You can configure DC power to the Smoothie in three basic ways:
Way #1
+24VDC from the LPS+5VDC from regulator installed on-board smoothie
Capacity: 24VA
Pro's: simple two wire connection
Potential Con's: marginal power for anything else, local display, finder led, Z table, pump etc.
Way #2
+24VDC from LPS+5V from LPS
Capacity: 29VA
Pro's: more capacity 5VDC + 12VDC
Potential Con's: marginal power for anything else, local display, finder led, Z table, pump etc.
Way #3
+24VDC from external supply with selected capacity+5VDC from regulator installed on-board smoothie
Capacity: based on external supply choice
Pro's: full DC capacity for K40 + expansion. Simple 2 wire DC wiring
Potential Con's: more complex wiring of AC mains (to add on supplies) and purchase cost of external supplies.
What works?
Many of the K40 conversions use Way#1 and 2, so it seems to work, I just do not know if it is marginal.
I chose Way#3 because:
- I want as much isolation as possible from the HV laser supply. In my configuration only the grounds are common.
- I wanted to make sure that the motors had full capacity under dynamic loads. I do not know the actual loads so I took the safe route :).
- I wanted extra capacity for future accessories like the local GLCD and driving the stepper for the lift table.
You can employ Way#1 or 2 and then measure the PS voltage to insure that it is not drooping.
https://www.amazon.com/gp/product/B018TG7I4W/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
or:
https://www.amazon.com/gp/product/B00UHI3NGS/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=AWUSKMLB3J3ZT
http://shop.uberclock.com/collections/smoothie/products/switching-regulator-dc-to-dc-5v
https://www.amazon.com/gp/product/B00UHI3NGS/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=AWUSKMLB3J3ZT
My Current Design
SCHEMATIC
The design is incomplete and is being documented here:
24VDC:
Separate 24vdc supply to smoothie to run the board and motors.https://www.amazon.com/gp/product/B018TG7I4W/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
or:
https://www.amazon.com/gp/product/B00UHI3NGS/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=AWUSKMLB3J3ZT
5VDC Power:
Integrated 5VDC regulator on smoothie and Display adapter provides all 5VDC.http://shop.uberclock.com/collections/smoothie/products/switching-regulator-dc-to-dc-5v
Laser Power Output:
- 24VDC from laser power: connected stand alone Z axis control. [this will be eliminated when zaxis is integrated with smoothie]
- 5VDC from laser PS: middleman sensor voltage
- Plug for 4 pin power connector on LPS:
- Connector Housing Receptacle 4 Position 3.96mm ST
- Housing:
http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=201599419&uq=636035940876325333
- Contacts:
- Male Posts:
12VDC:
Separate 12VDC supply: pump, cabinet lights, temperature alarm.https://www.amazon.com/gp/product/B00UHI3NGS/ref=ox_sc_act_title_2?ie=UTF8&psc=1&smid=AWUSKMLB3J3ZT
Fuses:
All DC supplies will be fused using:
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