MASSO
MASSO Documentation
Newark Element 14: Optocoupler KB817
Mouser Electronics: Optocoupler LTV-816
Testing procedure for Inputs 1 - 24
Remove any wire connected to the input you want to test
Go to the F1 screen and observe the logic state of the suspected input. It will show either HIGH or
LOW depending on whether the input is inverted or not.
Test the optocoupler by connecting the +ve of the MASSO power supply through a 5.6K resistor to
the input you want to test.
On the F1 screen you should see the input change from LOW to HIGH or from HIGH to LOW.
If the input changes from one state to the other the optocoupler is ok and does not need replacing.
Testing procedure for Spindle Encoder Inputs
Remove any wires connected to the Encoder inputs.
Go to the F1 screen.
Test the optocoupler by connecting the +ve of the MASSO power supply through a 5.6K resistor to
the chosen encoder input.
Encoder-A input you will see the Signal-A input of MASSO change from LOW to HIGH.
Encoder-B input you will see the Signal-B input of MASSO change from LOW to HIGH.
Encoder-Z input you will see the Index input of MASSO change from LOW to HIGH.
If the input changes from one state to the other the optocoupler is ok and does not need replacing.
If one is faulty only replace that optocoupler
Testing procedure for MPG Inputs
Go to the F1 Screen
Using your Pendant rotate the Manual pulse Generator, (MPG), and you will see the MPG-A and
MPG-B flicker between HIGH and LOW randomly. If you see them flicker the Optocouplers are ok
and do not need replacing.
Use the Pendant Axis selector switch and rotate through Axis X,Y,Z,A & B and you will see the
corresponding Axis select input change from LOW to HIGH as each is selected. If the inputs change
they do not need replacing. If one is faulty only replace that optocoupler
Use the Pendant Resolution selector switch to select between 1,10 & 100 and you will see
Resolution inputs 1, 2 & 3 Change from LOW to HIGH as they are selected. If the inputs change they
do not need replacing. If one is faulty only replace that optocoupler
Testing procedure for the Estop Input
Remove the wire connected to Estop 2
Go to the F1 screen and make sure the Estop input shows LOW and is not inverted.
v5.18 - 08 Apr,2021
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