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### Question #: 14906

Question: [2.2 kW (kilowatt) Water Cooled Spindle] What size circuit breaker should I use for this spindle?

Current Solution

The 2.2kW spindle has a power rating of 2.2kW or 2200 watts.

If the VFD AC voltage input is rated for 220 volts, then 2200 watts / 220 volts is 10 amps, so a 15 or 20 amp breaker will work.

If the VFD AC voltage input is rated for 110 volts, then 2200 watts / 110 volts is 20 amps, so a 25 or 30 amp breaker will work.

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### Other Possible Solutions to this Question

• [77] What circuit breaker should I use for this spindle?

The 2.2kW spindle has a power rating of 2.2kW or 2200 watts.

If the VFD AC voltage input is rated for 220 volts, then 2200 watts / 220 volts is 10 amps, so a 15 or 20 amp breaker will work.

If the VFD AC voltage input is rated for 110 volts, then 2200 watts / 110 volts is 20 amps, so a 25 or 30 amp breaker will work.

[77] What circuit breaker should I use for this spindle?

• [79] What size circuit breaker should I use for this VFD?

The 2.2kW spindle has a power rating of 2.2kW or 2200 watts.

If the VFD AC voltage input is rated for 220 volts, then 2200 watts / 220 volts is 10 amps, so a 15 or 20 amp breaker will work.

If the VFD AC voltage input is rated for 110 volts, then 2200 watts / 110 volts is 20 amps, so a 25 or 30 amp breaker will work.

[79] What size circuit breaker should I use for this VFD?

• what size circuit breaker should I use with the 2.2KW VFD?

The 2.2kW spindle has a power rating of 2.2kW or 2200 watts.

If the VFD AC voltage input is rated for 220 volts, then 2200 watts / 220 volts is 10 amps, so a 15 or 20 amp breaker will work.

If the VFD AC voltage input is rated for 110 volts, then 2200 watts / 110 volts is 20 amps, so a 25 or 30 amp breaker will work.

what size circuit breaker should I use with the 2.2KW VFD?

• [78] What size wrenches does this spindle take to tighten?

To loosen and tighten the collet nut for the 2.2kW spindle, I use a 22mm wrench (spanner) for the shaft and a 30mm wrench for the nut.

[78] What size wrenches does this spindle take to tighten?

• What kind of wire should I use between the invertor and the spindle?

The type of wire that should be used between the spindle and the VFD (Variable Frequency Driver also called the inverter) should be of stranded type and we use between 18 and 16 AWG.

The total current is divided among the three coil wires, therefor a wire gauge of 16 should be sufficient.

Currently we use 20AWG 4 conductor.

What kind of wire should I use between the invertor and the spindle?

• [797] What power supply should I use for this relay?

The dual 24VDC relay can use any 24V power supply that outputs 24V DC. A great power supply that will work well with this dual 24VDC relay is this power supply: https://buildyourcnc.com/item/electronicsAndMotors-power-supply-24v-1a-dc

[797] What power supply should I use for this relay?

• WHAT SIZE WRENCHES DOES THIS SPINDLE TAKE TO TIGHTEN?

To loosen and tighten the collet nut for the 2.2kW spindle, I use a 22mm wrench (spanner) for the shaft and a 30mm wrench for the nut.

WHAT SIZE WRENCHES DOES THIS SPINDLE TAKE TO TIGHTEN?

• What settings does I use for controlling the spindle in StepCon/Linuxcnc?

LinuxCNC has excellent documents; however, I would like to offer our help in case you don't understand the information on that page. So, please use this FAQ (Question #: 13233) to state your questions by submitting additional information below.

The LinuxCNC spindle control page is found here: http://linuxcnc.org/docs/html/examples/spindle.html

After reading the LinuxCNC page my first questions would be can the spindle be controlled by PWM signal? Also, what pin on the parallel port would I set to Spindle Enable and FRW?

To connect your computer to the VFD, use a USB to RS-485 interface. RS-485 is just a serial interface protocol that uses standard 0 to +5 voltage TTL signal levels for communication (as opposed to RS-232 which uses -12v and +12 for signal level changes).

Get a high quality interface to reduce any issues during the process. The VFD should have two terminals labeled RS+ and RS-. The USB to RS-485 adapter should have this labeled on it as well so the connections should be relatively straight forward.

In the VFD parameters:
PD001: 2 to accept RS485 commands
PD002: 2 to accept frequency comands
PD163: 1 to RS485 slave address:1
PD164: 1 RS485 baud rate 9600
PD165: 3 8bit, no parity, 1 stop bit

Make sure LinuxCNC is also set accordingly:

The PIN14 and PIN16 in the stepconf wizard should be set to unused because you don't want LinuxCNC to be outputting unnecessary signals.

In the options step of the stepconf wizard:
- Check the Include Halui user interface component.
- Check the Include custom PyVCP GUI panel.
- Check Spindle speed display

You will want to edit the custom.hal text file located in the folder that was created from the stepconf wizard. Add these following lines:
loadusr -Wn vfd hy_vfd -n vfd -d /dev/ttyUSB0 -p none -r 9600
net spindle-cmd-rpm-abs => vfd.speed-command
net spindle-cw motion.spindle-forward => vfd.spindle-forward
net spindle-ccw motion.spindle-reverse => vfd.spindle-reverse
net on motion.spindle-on => vfd.spindle-on

The dev folder in linux is typically used for interfacing devices and peripherals to the computer as these devices are communicated by simple memory addresses and these files are linked directly to these addresses.

Under the custom_postgui.hal file, change this line:

from: sets spindle-at-speed true
to: net spindle-at-speed => cfd.spindle_at_speed

setp vfd.enable 1

When you start LinuxCNC, you will a spindle section with the reverse and forward buttons, a stop button and - and + buttons. Use these buttons to conform that the spindle is functioning properly. The spindle speed indicator in LinuxCNC will show the spindle speed and you can confirm that this is equal to the speed indicated on the VFD.

Credit for this helpful information goes to:

Additional information was also added by us to provide a better understanding.

linuxcnc利用MACH3 接口板 BL-MACH-V1.1的一路经光耦隔离的 0-10V 模拟电压输出，可以控制具有相应模拟接口的变频器，控制主轴转速。输出口为 P1 口，如何利用这个p1口与变频器进行接线来控制主轴转速，并对hal文件配置代码进行书写

What settings does I use for controlling the spindle in StepCon/Linuxcnc?

• Which spindle should I use for PVC and Trespa (Hardwood)? Max diameter of cutter = 16mm Max thickness plate = 20mm

Either material, PVC or Trespa can be milled using our standard 2.2kW spindle.

https://buildyourcnc.com/item/spindle-inverter-2!2kw-spindle-vfd

Which spindle should I use for PVC and Trespa (Hardwood)? Max diameter of cutter = 16mm Max thickness plate = 20mm

• What wiring should I use to connect two motors for one axis?

Yes, you can use 2 motors in the same axis output, however you will still need a driver for that motor! Also depending on the orientation on which you mount the motor you might have to invert the direction of the motor, and that will be simple by swapping the A+,A-, to the B+,B- locations and vice versa, from the driver to the motor wiring.

Also you can run a slave motor using another axis on the board, and setting it up in the Planet-CNC settings.

Planet-CNC/File/Settings/Axes, here you will enter 3 in the Number of Axes location, and then change the Function of the Axis 4 to Slave 1. There you will have the 4th axis or A-axis be a slave for the x-axis.
Slave 1 - X-Axis
Slave 2 - Y-Axis
Slave 3 - A-Axis
Slave 4 - B-Axis
Etc...

Do you act as if it's one motor and it goes to one controller on the motherboard?

What wiring should I use to connect two motors for one axis?

• What thermocouple or thermister should I use for the extruder hot end?

The best choice would be a type K thermocouple.

What thermocouple or thermister should I use for the extruder hot end?

• [797] Should I use a 24V power supply for this relay?

The dual 24VDC relay can use any 24V power supply that outputs 24V DC. A great power supply that will work well with this dual 24VDC relay is this power supply: https://buildyourcnc.com/item/electronicsAndMotors-power-supply-24v-1a-dc

[797] Should I use a 24V power supply for this relay?

• I have the 2.2 kW spindle and VFD for 110v, just wondering what amperage this draws, as my electricain buddy is telling me I need to put in a 20 amp breaker for this. I cant seem to find any amerpage draw on the INPUT label

You can actually set a current limit in in the VFD using the programming process and the specifications in the manual that came with your VFD. You can expect the spindle at 220 Volts AC to draw (using the standard formula):

For Volts, I will use 230 as the range is generally 220 to 240.

Watts = Current * Volts

Can also be written as:

Current = Watts / Volts

Current = 2.2kW (2200 watts) / 230 volts

Current = 9.6 amps

• Why should I use a spindle rather than a router?

The spindle is quieter and has more consistent torque (It doesn't get "bogged down" when it starts cutting into material). It can be used with collets of varying sizes (not restricted to imperial sizes). It is water cooled and so it does not blow air downward to cool the spindle like the router does. The spindle is also machined with much higher precision than typical routers and will have a much longer life.

Why should I use a spindle rather than a router?

• WHAT CABLE LENGTHS SHOULD USE FOR THE BLACKFOOT CNC MACHINE

The blackfoot requires a total of 50 feet of cable.

The X axis needs 15 feet
The Y axis needs 17 feet
and the Z-axis needs 18 feet

These are 20 gauge 4 conductor cable.

WHAT CABLE LENGTHS SHOULD USE FOR THE BLACKFOOT CNC MACHINE

• what depth increment should I use for pocketing and profiling with the 1/2" end mill?

The pocketing depth per pass will depend on the hardness of the material, the router/spindle you are using and on the melting point of the material. Use the feedrate that you would normally use for the size and type of end mill. You will need to test the depth per pass, starting at the full depth of the pocket. The spindle should have no problem, but if you are using a router, then it may bog down, so easing up on the depth per pass is recommended. If the spindle/router has no problem at the depths you are using, then you need to evaluate the edge finish to determine if it is acceptable. If it is not acceptable, then ease up on the depth per pass. Keep doing these steps until you have the finish and precision you expect.

what depth increment should I use for pocketing and profiling with the 1/2" end mill?

• [801] Is this enough rating for a Nema 34 motor with max 6 amps? Also what about a 220V 2200Watt Spindle?

For the NEMA 34 stepper motor with a maximum current of 6 amps, 18 AWG wire would technically be sufficient. According to the American Wire Gauge (AWG) standard, 18 AWG wire can handle up to around 10 amps of current in chassis wiring and around 16 amps in power transmission. If you are considering running a very long length of cable from the driver to the stepper motor, you may want to consider using 16 AWG.

As for the spindle, this wire gauge is well-suited. There are three phase shifts, each at 120 degrees and each conductor is carrying only 1/3 of the power. At 220v, 2200 watts / 220 V = 10 amps. 1/3 of 10 amps is 3.333 amps, so each conductor will be have a load of 3.33 amps.

[801] Is this enough rating for a Nema 34 motor with max 6 amps? Also what about a 220V 2200Watt Spindle?

• WHAT CABLE LENGTHS SHOULD USE FOR THE BLACKTOE

The motor cables for the blackToe are as follows:

Total 30 feet

X - 9
Y - 10
Z - 11

WHAT CABLE LENGTHS SHOULD USE FOR THE BLACKTOE

• WHAT ELECTRICAL CABLE DO I USE TO CONNECT VFD INVERTER SPINDLE?

The type of wire that should be used between the spindle and the VFD (Variable Frequency Driver also called the inverter) should be of stranded type and we use between 18 and 16 AWG.

The total current is divided among the three coil wires, therefor a wire gauge of 16 should be sufficient.

Currently we use 20AWG 4 conductor.

WHAT ELECTRICAL CABLE DO I USE TO CONNECT VFD INVERTER SPINDLE?

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