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Picture - for the heck of it

4-axis encoder interface for use with Mach2/3/4 CNC control software. Have not yet printed hard copy or read.

Safety Charge Pump Board: To go on its own page.

• Am using: http://cnc4pc.com/Safety_Charge_Pump.htm

• For the Geckodrives. http://www.timgoldstein.com/cnc/heatsink.asp
• Individual heatsink and fan for the Geckodrives. http://www.newegg.com/Product/Product.asp?Item=N82E16835150036
• From CNCzone, Kenwood714;~ " So at 20 amps they would dissipate around 50 watts. But I doubt you will be running the drives at that load all the time. A healthy chunk of aluminum with one fan for three drives will work fine."
• "I also bought a tube of silicone heatsink gloop"

• Am using a 110 VAC fan.
• The VDC's appear to be 5, 12, 24, 28, 36 & 48.
• http://www.nmbtech.com/axial_fans_blowers_component_cooling.htm
• http://www.nmbtech.com/html/fans/engineering/engineering_101.html
• http://www.nmbtech.com/cgi-bin/start.cgi/nmb/fanstart.html

• 110VAC
• 2 only 6-position 15A Terminal strips. One for positive and one for negative. Cinch 6-140-P. - Two only 6 positions joined by 6 only jumpers. Cinch 140J1-P-4 (set of 4)
• 48VDC
• 2 only 8-position 15A Terminal strips. One for positive and one for negative. Cinch 8-140-P. - Four only 4 positions joined by 2 only jumpers. Cinch 140J1-P-4 (set of 4)

• HomeCNC's schematic shows a 1.2K 5W resistor.
• Schematic on CNCZone shows a 2K 10W resistor.
• The schematic by Donald Brock shows a bleed resistor but he does not give it a value.
• Is there one already in the 48VDC power supply? See 'Bleed Resistor' notes below and on 1361.html
• The CNC4PC (5VDC/12VDC) power supply does not include a resistor, but perhaps the power is to small too warrant one.

• Power ~ 110VAC to 12VDC & 5DC: Toggle SPST On-Off, 3A [Circuit-Test Electronics ~ 453-320] From RP Electronics. Get larger one, both amperage and physically.
• Startup: Momentary contact push button, SPST, only 5VDC. It works in parallel with the Safety Charge Pump. [Lee's Electronics #3288] Should this have a light [amber or green] associated with it?
• Interface Reset: Momentary contact toggle switch, SPDT, 15A 120V, It is large so as to be easy to operate. [Lee's Electronics #3364 ~or~ 42-4245-0]
• Engage / Disengage: Momentary contact, SPDT, Center off position. It works with Err/Res on Geckos.
• Engage is when the switch is transferring power (+) a source to the ERR/RES terminal on the Gecko.
• Disengage is when the switch is drawing power (-) a drain from the ERR/RES terminal on the Gecko.

• Power ~ 110VAC to 12VDC & 5DC. Amber neon leaded indicator lamp w/ internal resistor 120VAC [Mode #55-483-1]
• Power ~ 48VDC. Amber neon leaded indicator lamp 12VDC [Mode #55-493-1]
• The lamp's resistance is 25.7 Ω, however it will significantly increase when the temperature rises when it is on.
• When tested at 12 volts the current is 49.3 milliamps.
• The power consumed by the lamp is therefore V * A = W = 12V * 0.0493A = 0.59W
• Therefore;
• At 48VDC (actually 52.7VDC) the current must be A = W/V = 0.59 / 48 = 0.0123A. ~or~ 0.59 / 52.7 = 0.0112A
• The calculated total resistance in the circuit must be; Ω = V/I = (48 / (48/12)) / 0.0123 = 976 Ω. ~or~ (52.7 / (52.7/12)) / 0.0112 = 1071 Ω
• Test with 1K Ω resistor:
• The output of the power supply is 48 V and 12 A
• With a 1K resistor in series with the lamp the current is 43 mA. The light is on at perhaps slightly dimmer than normal and the resistor is hot but can be touched for a second or two..
• The voltage across the light is 9.1V. The voltage across the resistor is 43.3V. The power consumed by the resistor is 43.3V * 0.043A = 1.86W
• The total power consumption would appear to be 52.7V * 0.043A = 2.27W.
• Test with 500 + 400 Ω resistors in series:
• The output of the power supply is 48 V and 12 A
• With the 500 Ω resistor, the 400 Ω resistor and the lamp in series the current is 47.4 mA. The light's intensity looks normal and the resistors are only warm.
• The voltage across the light is 11.14V. The voltage across the resistor is 41.26V. The power consumed by the two resistors is 41.26V * 0.047A = 1.94W
• The total power consumption would appear to be 52.7V * 0.0474A = 2.5W. Dividing this wattage between two resistors would produce little heat per resistor.
• Go with 2 * 470Ω, 5W or 2W Resistors :
• Total of 940 Ω for a voltage of approximately 10.25V, a total power consumption of approximately 2.4W and a power consumption of approximately 0.97W per resistor.
• Re Bleed Resistor: This light is on the output side of the power supply. 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. The light goes out approximately 30 seconds after the power is turned off and at this time the voltage is down to 35 VDC.
• Mach3 OK: Green LED.
• [Lee's Electronics #550].
• Interface OK: Green LED.
• It works with EStops, Limits and Interface reset push button. [Lee's Electronics #550]
• Fault LEDs: 6 required. . Red LED [Lee's Electronics #549]
• Red LEDs. One per servodrive, They indicate a fault in a specific servodrive.

• Vacuum: (110VAC)
• Spindle: (w/ variable speed) (110VAC)
• Interlocking of guards:
• Axis Parts Clamps:
• Thread Tension:
• Epoxy Application:
• End of Thread or Broken Thread;
• Excessive Thread Tension:

• The Camtronics Controller mentions a Power Supply of 110V primary, 36VDC at 25A

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