INFORMATION: This page is for the MASSO G2 only.

Sourcing replacement parts

INFORMATION: Damaged Optocouplers can be purchased from one of the following suppliers, please click the link below to directly jump to the part order page:

Digi-Key:  Optocoupler LTV-816

Newark Element 14: Optocoupler KB817

Mouser Electronics: Optocoupler LTV-816

Identifying Optocouplers

Testing procedure for Inputs 1 - 32

• 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:0 Pos: 100 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.
• Test the optocoupler by connecting the +ve of the MASSO power supply through a 5.6K resistor to EStop2 input
• On the F1 screen you should see the input change from LOW to HIGH.
• If the input changes from one state to the other the optocoupler is ok and does not need replacing.

Testing procedure for CW & CCW outputs

Testing the CW output

• Remove the wires from spindle control terminals 4 & 5
• Go to the F1 screen and ensure the CW output is not inverted. If it is remove the invert and remember to put it back on when you are finished testing.
• Go to the F2 screen and set the spindle to off
• Use your Digital multimeter set to continuity 2K
• Connect one lead of your multimeter to terminal 4 and the other lead to terminal 5 of spindle control
• You should read no continuity on your multimeter.
• Swap the meter leads around and you should still have no continuity reading on your meter.
• If you get a continuity reading in either polarity of your meter the optocoupler is faulty and needs replacing.
• Go to the F2 screen and set the spindle to CW by clicking the Spindle CW button on the screen
• You should read 200 ohms or less on your meter
• If you get no continuity reading reverse the leads of your meter and retest as this is a polarity conscious output.
• If you still do not get a reading to 200 ohms or less when the spindle is on the optocoupler is faulty and needs replacing.

Testing the CCW output

• Remove the wires from spindle control terminals 6 & 7
• Go to the F1 screen and ensure the CCW output is not inverted. If it is remove the invert and remember to put it back on when you are finished testing.
• Go to the F2 screen and set the spindle to off
• Use your Digital multimeter set to continuity 2K
• Connect one lead of your multimeter to terminal 6 and the other lead to terminal 7 of spindle control
• You should read no continuity on your multimeter.
• Swap the meter leads around and you should still have no continuity reading on your meter.
• If you get a continuity reading in either polarity of your meter the optocoupler is faulty and needs replacing.
• Go to the F2 screen and set the spindle to CCW by clicking the Spindle CCW button on the screen
• You should read 200 ohms or less on your meter
• If you get no continuity reading reverse the leads of your meter and retest as this is a polarity conscious output.
• If you still do not get a reading to 200 ohms or less when the spindle is on the optocoupler is faulty and needs replacing.

Replacement Process

WARNING: Ensure that you turn the power off to MASSO and observe standard Antistatic precautions before changing an optocoupler.

CAUTION: Ensure that you observe the correct orientation of the optocoupler when replacing as they are polarity sensitive.

• Observe the polarity of the optocoupler. Take a photo if you are not sure. Each Optocoupler has a dot on it to identify pin 1
• Using a suitable pair of long nose pliers or tweezers gently remove the faulty Optocoupler from it's socket. It should come out easily.
• Push the replacement Optocoupler into place until it is correctly seated. Make sure all pins are in the socket.
• Test to check that it is now working.