2050M Knee Mill Installation


This installation manual shows you how to install your 2050M knee mill control kit (KT-2050M-RP). 


2050 control retrofit kit



Step 1. Mount Back Panel 

Remove old components

1. Remove everything in the electrical enclosure besides the original transformer.

2. Measure the size of your current electrical enclosure. The new back panel is 21" x 21". If your electrical enclosure is too small you will also have to remove the original door switch. 

3. Remove the old cables running to the motors. 

Mount the new panel

1. Drill holes into the old back panel.  

2. Mount the new panel onto the original back panel. It should look like this:

Back Panel Mounted

3. Mount the brake resistor to the wall of the electrical enclosure but close enough so the cables will reach the VFD. 

Brake Resistor


Step 2. Mount Control

See the  2000 Series Mounting Arm Manual to mount the arm and control. 

Step 3. Connect Control and Power

Connect Cables to the Control

1. Remove round, rubber plug from the back of the control. Run conduit from the control to the back panel.

2. Connect ethernet cables, power connector cable, and E-stop cables into the control as shown below. (For panels with the Delta VFD, there will only be 2 E-stop leads instead of 4.)

CNC control connections


Connect Cables to the Back Panel

1. Connect light blue "EtherCAT" cable into N2 on the CTB servo drive.

EtherCAT connection

2. Connect the green "Machine Network" cable into the VFD. Depending on the version you may have a Delta MS300 or a Yaskawa V1000.

TCP Modbus Delta Drive Connection

3. Connect the blue "Internet" cable to your local network if you do not plan to use the built in WiFi. Internet is not necessary to run the control. However, help from our support team will be greatly limited without access to the internet.

4. Connect the control Power Connector cable to PC 24V, PC 0V and GND blocks.

5. For the Delta drive, connect two E-stop leads to the terminal blocks on the back panel as shown below. For E-stop, one wire should run to the 24V block and one wire into the E-stop block.

For the Yaskawa drive, connect four E-stop cables to the E-10, E-11, E-20 and E-21 blocks as shown here.

Note: If you have an additional external E-stop, wire it in series with the control E-stop. You will need to connect your external E-stop into the 24V block and the other side into the blank terminal block. Then connect the red wire from the control E-stop into the blank terminal block as well. Finally, put the black wire from the control E-stop into the terminal block labeled E-Stop. 


Wire Incoming Power

1. Wire incoming power to the back panel into the top of the door switch.  Be sure you are bringing in the 208-240VAC. The back panel can run on single phase or 3 phase. 

Note the max spindle motor power limitations:

  • 5hp spindle motor with three phase power
  • 3hp spindle motor with single phase power

2. Connect the transformer. Start by identifying the primary and secondary side of the transformer. The transformer will be fed with 240VAC and we need 120VAC output. If the transformer doesn't have clear markings and your machine doesn't have a schematic, you may have to google the transformer part number to figure out how to wire it. 

For example, in this transformer you will connect 240VAC to H1 and H4 and you will get your 120VAC power from X1 and X2. 

Transformer Schematic

Connect primary side of the transformer to 240VAC from the two 4FU fuses shown below. Then connect the secondary side to 5CB and terminal 502. 

Make sure to ground the secondary side of the transformer. In the example above, you would ground X2. 


Step 4: Mount Motors

Mount the motors to the machine using the motor mounting plates provided. If possible, take a look at the gears and write down the number of teeth on the motor gear and the ball screw gear. If you write down the gear ratio specifications, ball screw pitch, etc. now, it will make calibration much faster later.

MachMotion Motor Mounted


Step 5: Run Cables

Route Motor Cables

Run the motor cables (Encoder and power) from the motors to the back panel. If the machine was equipped with CNC components before the retrofit the cables can usually follow the path of the old motor cables.

Take care when running the cables to keep them away from pinch points and sharp edges. The cables are protected by robust insulation but repeated wear and tear will cause damage and eventual failure. If the cables must run over a possible wear point, use some form of loom for additional protection. Keep in mind the motion of the machine and possible cable snag points while the machine is moving.

Connect Cables to Drive

There are two cables that come from each motor. One is for motor power and the other is motor encoder.

The X motor power cable (U,V,W,GND) will need to be wired into U1, V1, W1 and GND. The X motor encoder cable will need to be plugged into T4. See the below diagram

The Y motor power cable (U,V,W,GND) will need to be wired into U2, V2, W2 and GND. The Y motor encoder cable will need to be plugged into T5. See the below diagram

The Z motor power cable (U,V,W,GND) will need to be wired into U3, V3, W3 and GND. The Z motor encoder cable will need to be plugged into T6. See the below diagram



Encoder Cables

Encoder and Power Cables


Wire Spindle Motor

Determine if your machine has the Delta MS300 or the Yaskawa V1000 VFD.

For the Delta MS300:

1. Remove the cover from the Delta MS300 VFD as shown.

Remove Delta Cover

2. Connect your spindle motor to the terminals labeled U/T1,V/T2, and W/T3 as shown in the below image.  


3. Connect the two leads from your brake resistor to +2/B1 and B2 terminals on the VFD as shown in the figure below.
(Delta VFD MS300 Connection to Brake Resistor)

For the Yaskawa V1000

1. Loosen screw and remove outer plastic cover.

2. Press tab to remove second plastic cover.

3. Connect your spindle motor to the terminals labeled U/T1,V/T2, and W/T3 as highlighted in the below image.

4. Connect the two leads from your brake resistor to B1 and B2 terminals on the VFD as shown below.

Step 6: Wire Inputs and Outputs

Wire any inputs and outputs as shown in the diagrams below.

Output Commons

Please note, the output common comes pre-jumpered to the 120v circuit to the left of output wiring block as shown below. Verify the voltage of each output destination before wiring. If any of your outputs run on 24VDC, make sure the output common for that output is jumpered to 24V.


Wiring Lube System

Wiring Coolant System

For a contactor with 120VAC coil, wire it as shown. 


Note: The contactor shown above is not included. Use the original contactor on your machine.

Coolant Pump Power

You can power up to a 0.5 hp 3 phase coolant motor. To run a 3 phase motor, the back panel will have to be powered with 3 phase. Run 3 wires from 2L1, 2L2, and 2L3 on the top of the back panel to the contacts on on your contactor. 


Wiring Spindle Brake2000-Series-Knee-Mill-Backpanel-Spindle-brake.jpg

Wiring Tool Setter


Wiring Probe

Step 7: Power System Up

  1. Carefully inspect incoming power to make sure it is within range for your system. Most systems use 208-240 VAC.
    1. We recommend utilizing a Multimeter to check incoming power. If using 3 Phase check all 3 phases. 
    2. Turn the door switch on.
    3. Check the transformer is outputting the correct voltage as well.
  2. Run motion on the machine
    1. Lower the jog rate using the knob on the control

      Jog Rate

    2. Carefully jog each axis. Confirm that they are traveling in the right direction.
    3. If a motor is traveling in the wrong direction is can be easily reversed in the Mach4 software. Navigate to the top left of the screen and click Configure>Mach and then click on the Motors Select the problem motor and check the Reverse check box.
  3. Test inputs and outputs The best way to do this is use the buttons already setup for the intended fuction, for example "Coolant" has a hard button on the control. You can also toggle signals manually.
    Under the service tab, click on"MachineI/O"

    Double clicking on a signal will change its state. Double click again to change it back.



Step 8: Configure Software

There are two options for setting up units and soft limits. Typically, the easiest way is to use the MachMotion Knee Mill setup Wizard. 

Automatic Setup:

Select the "Kneemill Setup Wizard" from the "Configure" drop down on the main menu. This will guide you through an initial setup process that will allow you to set soft limits, units calibration, and spindle calibration.

 You can also go through each step manually by following the information on completing the set up process for "Units Calibration" and "Homing and Soft Limits" outlined below.

Manual Setup:

Units Calibration

Before the machine is homed or any further setup is completed we must calculate our steps per/unit and calibrate the motors accordingly. Mach Motion has a plugin to streamline this process. 

  1. If you know the gear ratios, ball screw pitch, etc of your machine, use the Automatic Calibration shown here: 
    1. Open Configure>Plugins>Machine Calibration
    2. Select Automatic Calibration
    3. For each axis, select the drive used for that axis, input the machine configuration, press Calculate, then Accept
    4. Close the calibration window
    5. Open Configure>Plugins>Machine Calibration
  2. If you do not know the gear ratios, ball screw pitch, etc of your machine, use the manual calibration shown here:
    1. Select Manual Calibration
    2. Select Commanded Distance
    3. Input 1 in the 'Distance to move axis' field
      • If the machine is setup with metric units, enter 25.4 instead.
    4. For each axis, do the following:
      1. Setup a dial indicator for positive 1" machine travel
      2. Enable the machine
      3. Press the Move button
      4. Input the distance actually moved in the 'How far did the axis move' field
        • If the machine is metric, be sure to enter distance traveled in millimeters
      5. Press Submit, then Accept
Homing and Soft Limits

With the motors calibrated, we can now home the machine and set up the software limits

  1. Carefully jog X and Y to the negative extremes of travel and the Z axis all the way up as shown in the picture below.
  2.  Machine Homing PositionY axis   X axis   Z axis
  3. Navigate to the Settings and click Home All. The machine is now homed. 
  4. Next we need to set up the soft limits to prevent crashes. On the upper left hand side of the screen select Configure and then Config Soft Limits.
  5. Follow the prompts listed. Soft limit set up can be done on all axes at the same time.
Backlash Compensation
  1. Move an axis in one direction farther than the maximum possible backlash.
  2. Mount a dial indicator and zero it.
  3. Move the axis again in the same direction for a specific distance (it doesn’t matter how far).
  4. Move the axis backwards the same distance.
  5. Note how far the dial indicator was off from zero to see the axis’s backlash value.
  6. On the menu bar go to Configure->Control
  7. Select the Motors tab, then the corresponding motor for the axis.
    • If you are unsure which motor is on which axis, you can view the settings on the Axis Mapping page.
  8. Enter the backlash distance in the Backlash field
Spindle Gear Range Setup

To accurately setup the gear ranges on your machine, first set your variable pulley to the max range.

Take the max and min RPM for each gear range in input them in the gear range settings shown below. You can access this screen by going to Configure>Control>Spindle

Most machines will need to be reversed in one gear range or the other to compensate for the mechanical change. Check the Spindle RPM with a Tachometer. Adjust the MaxRPM value to compensate for any discrepancies in speed.

Lubrication Pump 

Your kit is pre-configured with a relay to control the Lube Pump, as seen above. You can change the frequency and duration of which it runs in the MachMotion parameters. 

Under the Service tab, click the "Interface Config" button. 

Then search "Lube"


Your Variable Frequency Drive will need to be calibrated for your motor.  This can be done directly from the operating software! Under the Service tab, click the "Interface Config" button. 

Now, search for your VFD. In the search bar (top bar outlined in red below), type in the model that came with your cabinet. It is either a "Yaskawa V1000" or a "Delta MS300." That will bring up the editable parameters (shown in the lower red box below). Simply highlight the value to change it. Many of these values may be able to remain the default ones. 

You can find out what parameters need to be changed by looking at the info on your spindle motor name plate. Check and change any of the values that need it (Number of poles, wattage, amperage, etc.) to make sure your spindle runs at peak performance.

For information about Operation please see "2000 Series Mill / Router Operating Manual"

Warranty Information

MachMotion warranty policy is subject to change. Updated information is available at our website:


The MachMotion Team
14518 County Road 7240, Newburg, MO 65550
(573) 368-7399 • Fax (573) 341-2672


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