MASSO
MASSO Documentation
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
v5.18 - 08 Apr,2021
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