Troubleshooting the MASSO Pendant

This troubleshooting guide applies to the official MASSO pendant. Some information may not apply to third-party devices.

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All MPG inputs must show No in the Invert column or the pendant will not work correctly. When the MASSO pendant is unplugged, all MPG inputs must show Low. If any MPG input shows Yes in the Invert column, select the input and press the spacebar to change it to No.

When the pendant is plugged in and turned on, the selected inputs will change to High.

Turn the axis selector knob through all five positions (X, Y, Z, 4 and 5). The corresponding X, Y, Z, A and B select inputs should go High one at a time.

When the MASSO MPG is turned off, or when Axis 6 is selected, only the selected Resolution input should be High.

At any time, there should be one Axis Select input and one Resolution input showing High. If more than one of either is High at the same time, the pendant will not behave correctly. The most likely cause is an inverted MPG input. Check that all MPG inputs show No in the Invert column.

While viewing the F1 screen, select each axis and each resolution on the pendant and confirm that the corresponding input changes to High. If an input does not change when selected, the most likely cause is a broken wire inside the pendant.

When the manual pulse generator is turned, it is normal to see MPG Dial Signal-A and MPG Dial Signal-B inputs switching between High and Low in what may appear to be a random pattern.

If turning the MPG dial does not cause the axis to move, check the step size. If the axis step size is larger than the single step selected on the pendant, the axis will not move.

For example, if the axis step size is 0.03 mm and the pendant is set to ×1 (0.01 mm), the axis will not move because the pendant step is smaller than a single axis step. Selecting ×10 (0.1 mm) will allow the axis to move.

If the E-Stop on the pendant does not work, ensure it is wired to EStop1. If it is connected to EStop2, move it to EStop1.

If MASSO cannot be released from E-Stop, check that the pendant is plugged in correctly. The E-Stop signal passes through the pendant, and unplugging it will place the machine into E-Stop.

For more information on E-Stop wiring, please see: Estop Wiring

Estop pin 1

Extension Cables

If you are using an extension cable between MASSO and the MASSO Pendant, plug the pendant directly into the MPG port on MASSO to eliminate the extension cable as the cause of the issue.

If the extension cable is the problem, check each wire end to end and ensure the metal shroud is connected end to end, as the shroud forms part of the electrical circuit.