Spindle Control

 

WARNING: Observe ESD precautions are used when working on the board and components are static sensitive.

For information on ESD protection please see:    >>>HERE<<<


 

 

 

 

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      Spindle Clockwise TVS Protection Diode   - NXP - PESD5Z5.0

      Spindle Counter Clockwise  TVS Protection Diode   - NXP - PESD5Z5.0

       Spindle Clockwise Diode  - Leshan Radio - LBAS21HT1G

       Spindle Counter Clockwise Diode   - Leshan Radio - LBAS21HT1G
 

 

 

WARNING: Observe ESD precautions are used when working on the board and components are static sensitive.

Spindle Control Output Pin 2 & 3 Testing

 

The first step in testing the CW & CCW outputs is to follow the testing process outlined in the MASSO documentation 

https://docs.masso.com.au/getting-started-guides/troubleshooting-guides/vfd_spindle

 

If the optocoupler IC test faulty and replacing them does not fix the issue then most likely the problem is in the components that drive the optocoupler IC

 

 

The Optocoupler IC's are driven from Spindle control outputs 2 & 3.
If these have been damaged then the optocouplers will not work.

 

 

Testing Spindle control pin 2

  • These tests are for when Clockwise is not working
  • This test is done with MASSO Turned on.
  • Ensure there is nothing connected to Spindle control Pin 2
  • Go to the F1 screen and press the Spindle CW button   
  • Measure the voltage between spindle control pin 2 and MASSO GND
  • You should measure 3 volts nominal.
  • If the voltage is below 2 volts examine the protection diode

 

Protection Diode

 

  • PESD5Z5.0
  • This diode protects against static discharges and voltages applied to the spindle control output 2
  • The diode can be tested using the diode test on a multimeter as follows:

  • Turn MASSO Off and leave it off for the following tests.
  • Disconnect all wiring from the Output under test
  • Set meter for Diode test mode.
  • Connect the Black meter lead to MASSO GND and connect the Red meter lead to the Spindle control output 2
  • The meter should show a 1.4v nominal reading.
  • Connect the Red meter lead to MASSO GND and using the Black meter lead to Spindle Control Output 2
  • The meter should read 0.7 volts nominal. (A reading of 0 means the diode is short circuit to GND)
  • Compare the result with Spindle control pin 3 if you are unsure what you should be seeing.
  • If this diode does not measure correctly, it can be removed for the board and the output should start working again.
    The protection diode is not required for normal operation of the output and can be left out or be replaced as required. If left out here will no longer be protection from ESD
     

 

Testing Spindle control pin 3

  • These tests are for when Counter Clockwise is not working
  • This test is done with MASSO turned on
  • Ensure nothing is connected to Spindle control pin 3
  • Go to the F1 screen and press the Spindle CCW button   
  • Measure the voltage between spindle control pin 3 and MASSO GND
  • You should measure 3 volts nominal.
  • If the voltage is below 2 volts examine the protection diode
     

 

Protection Diode

 

  • PESD5Z5.0
  • This diode protects against static discharges and voltages applied to the spindle control output 3
  • The diode can be tested using the diode test on a multimeter as follows:
  • Turn MASSO Off and leave it off for the following tests
  • Disconnect all wiring from the Output under test
  • Set meter for Diode test mode.
  • Connect the Black meter lead to MASSO GND and connect the Red meter lead to the Spindle control output 3
  • The meter should show a 1.4v nominal reading.
  • Connect the Red meter lead to MASSO GND and using the Black meter lead to Spindle Control Output 3
  • The meter should read 0.7 volts nominal. (A reading of 0 means the diode is short circuit to GND)
  • Compare the result with Spindle control pin 2 if you are unsure what you should be seeing.

If this diode does not measure correctly, it can be removed for the board and the output should start working again.
The protection diode is not required for normal operation of the output and can be left out or be replaced as required. If left out here will no longer be protection from ESD