NOVA series How To replace the 24VDC Controls Power Supply

NOVA series How To replace the 24VDC Controls Power Supply

This article covers how to replace the 24V Power supply that powers the controls for your NOVA machine. Note that this was done on a NOVA35. Larger Machines like the NOVA63 will have this Power Supply by it self not hidden by the 36V power supply. You can skip the removal steps for the 36V power supply in that case (steps 4 thru 6).

You will need:
-60 minutes
-Phillips screw driver with standard length
-Camera
-Replacement Meanwell LRS-75-24 power supply

UNPLUG THE MACHINE FROM THE WALL BEFORE WORKING ON IT. TEST BY TRYING TO TURN THE MACHINE ON OR WITH A VOLTMETER TO VERIFY POWER IS REMOVED


Step 1: Unplug the Machine from the wall outlet and the back of the machine at the socket















Step 2: Flip the Main Breaker to the Down Position




Test that Power is removed from the 36V Power Supply. Check that there is no voltage from L4 to N4 and L4 to PE\GND
(Note that the terminals on the Power Supply are Labeled L, N and the Ground Symbol)

Step 4: Take a Picture of your wiring before removing the wires from the terminals. (Note that your order of wiring may vary, there are groups of common terminals V+ and V-)
-Remove the plastic cover over the terminals



Step 5: Disconnect the Power Supply wiring and push fork terminals to the side (optional, you can swing the power supply to the side but be sure to support its weight if you just leave it hanging)




Step 6: Remove the 4 Screws (Circled in Red) holding the power supply to the backpanel (2 Per side). Start with the right side first, be careful not to drop them. Move the power supply out of the way.
 

(These screws will be easier to  access with the wires removed from the terminals)



Test that Power is removed from the 24V Power Supply. Check that there is no voltage from L3 to N3 and L3 to PE\GND
(Note that the terminals on the Power Supply are Labeled L, N and the Ground Symbol)


Step 7: Take a Picture of your wiring before removing the wires from the terminals of the 24V power supply and then disconnect the wires



Step 8: Unscrew the two screws holding the power supply to the back panel. Should be on the bottom left and top right corner as marked by the red circles in this picture.




Step 9: Re-wire the 24v and 36v power supplies. Pay attention to wiring and when you tighten the screws, make sure the termination is not landing on the insulated part of the of the fork. Before re-installing the the 36V over the 24V (if applicable), lets set the voltage level for the 24V Power Supply.






Step 10: Adjust the Power Supply for 24V output:
Once everything is wired and double checked for correctness, power the machine back up and turn on the Main Laser Switch. Use a voltmeter to measure the output from V+ to V- and Adjust the White Trim Pot to get 24V reading on the voltmeter. With a small flat head screwdriver, turn the trim pot next to the green LED slowly clockwise to increase voltage, counter-clockwise to decrease.










Step 10: Now turn off the machine, unplug the main power and flip the breaker like step 1 and 2 and secure the 36V power supply (If applicable) to return the machine to runnable condition.

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