Fanuc AC digital spindle speed adjustment procedure 

The following procedure outlines the process for setting up and adjusting the spindle speed of a GE FANUC AC Digital Spindle Drive installation. It assumes the following:

• M03 is CW (spindle forward) for the motor shaft and uses spindle input SFR signal.
• M04 is CCW (spindle reverse) for the Fanuc motor shaft and uses spindle input SRVsignal.
• Programming of 0 RPM is possible. Some MTB's limit the minimum spindle speed. Proper spindle adjustment requires 0 RPM. Change the minimum spindle speed limit for adjustments and reset to desired minimum speed afterward.

The following are the Basic Steps for Spindle Speed Adjustment

1. Set CNC Output Voltage Offset.
2. Set Spindle Amp Tach Offset and Input Voltage Offset
3. Set CNC Output Voltage Scaling
4. Set Spindle Amp Input Voltage Scaling
5. Verify Operation

1. Set CNC Output Voltage Offset
   1. Connect DVM to Spindle Control PCB Test Points DA2 and 0V.
   2. Program M03 S0000 .
   3. Adjust the following parameters until 0.00 V is measured.
      Series 0T. . . . . . . . . . . 539
      Series 0M. . . . . . . . . . .577
      Series 10/11/12/15 . . . 5613

    

2. Set Spindle Amp Tach Offset and Input Voltage Offset.
   1. Connect DVM to Spindle Control PCB T.P. TS3 and 0V.
   2. With M03 and S0000 programmed, adjust RV3 (1S - 3S) or Spindle Amp parameter F-29
      (all others) for 0.00 V .
   3. Adjust Spindle Amp parameter F-10 for 0 RPM on 7-segment display.
   4. Program M04 S0000 and adjust F-11 for 0 RPM on 7-segment display.
   5. Stop spindle (M05) and pess DATA SET to store Spindle Amp parameters.

    

3. Set CNC Output Voltage Scaling
   1. Connect DVM to Spindle Control PCB T.P. DA2 and 0V .
   2. Program 3/4 of Max Speed for the high gear range. (For 4500 RPM Spindle, program S3375)
   3. Adjust the following Gain parameters for 7.5 V .
      Series 0T/M. . . . . . . . . . 516
      Series 10/11/12/15 . . . . 5614

    

4. Set Spindle Amp Input Voltage Scaling
   1. With M03 and 3/4 of max spindle speed programmed, adjust RV1 (1S - 3S) or Spindle Amp parameter F-13 (all others) until the proper RPM is reached on the 7-segment display.
   2. Program M04 and 3/4 of max spindle speed and adjust RV2 (1S - 3S) or F-14 for the same speed.
   3. Stop spindle (M05) and pess DATA SET to store Spindle Amp parameters

5. Verify Operation
   1. Power off/on and keep the DVM on Spindle Control PCB T.P. DA2 and 0V .
   2. Program M03 and desired speed.
   3. Verify proper voltage and spindle RPM for several different S commands.
   4. Repeat above step with with M04.

Proper Readings across DA2 and 0V T.P. on Spindle Control PCB: