Megado Dobby 2.0 - solving connection problems

If the Megado Dobby 2 does not seem to work properly, and restarting the computer and the dobby does not solve the problem, the next step is to check the hardware.   

It’s most common that a dobby malfunction is a software problem. If you are connected to weaving software via the USB cable, first check whether the computer recognizes the weaving COM port (see the dobby user manual) 

If you are using the Dobby 2.0 web interface software, check if your wifi connection between dobby and IPad (display device) has dropped.  reconnect if needed ( see dobby user manual)

Next test solenoid activation.  With the power on, press the test button (red). A successful test results in all solenoids activating one after the other starting with #1.    Stop the test by pressing the test button again.

The sensors on the Megado are sensitive to 1mm. This means the switch block must pass within 1 mm of both top and bottom sensors. The switch block is mounted on the knife bar opposite the sensors on the dobby.

If necessary, adjust the position by loosening the plastic nuts that attach the switch block to the dobby knife and improve the position.  The metal post of the switch block screws in and out of the switch block allowing you to fine tune the position laterally.

If the Dobby 2 is mounted on an older megado, there are only two bolt connection points.  This makes it more difficult to ensure proper distance from both top and bottom sensors.  Make sure it hangs exactly parallel to the side of the loom.  To do this adjust the bottom of the dobby with the adjustable buffers.

See this video that shows switch block positioning.

The next test is to remove the dobby box from the loom to do the screwdriver test.
Place the dobby on the table with the solenoids facing up and power up the dobby. Also connect it to the computer or web interface.

Open a pattern and activate weaving mode of the weaving software.

• Now use a screw driver to simulate the switch block.
• take the screw driver and touch the top sensor - this should activate the solenoids
• next move the screw driver down to the bottom sensor and touch it - this should deactivate solenoids.
• repeat these steps, moving the screw driver back and forth between top and bottom sensors
• If solenoids activate and deactivate as expected, your sensors are functioning correctly and you need to work on correct alignment of the dobby and switch block on the loom.

If your dobby sensors are appearing not to work, If the dobby fails the screw driver test, then you likely have a failed sensor(s) or one of the circuit boards has failed.   Contact Louet support [e-mail]