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Problem

If the machine is not operating and the” information light” next to the power button at the rear status panel of the machine and the firmware LED on the logic board flashes with the following eight-bit pattern as described here:

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This will be displayed in MotorScope as a “Stall Fault”. This means that the machine doesn’t move even though the motor is powered. This error can occur on all three axis axes but the debugging procedure is always the same.

Solution

The following items provide step by step instructions on how to break down the cause of the issue:

1. When the machine is off, push the axis by hand. If it is very difficult to move the axis then:

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1. Put the machine in E-Stop and push the affected axis manually. Compare the feel to when the machine is in standby. A strong braking should be felt when the machine is in standby.

   If the braking

   1. Check the lead screw, axis alignment, coupler, or band drive, and contact Micro-Vu support.

2. Turn the machine on and press the E-Stop. Push the affected axis by hand. Strong braking should be felt when the E-Stop is pressed. Turn the machine on and release the E-stop and place the machine on Standby. Push the affected axis by hand. Braking should be weak compared to strong braking felt when the E-stop is pressed. Compare the braking between both scenarios. If braking when the E-stop is pressed is weak (compare to the working

   axes

   axis), or intermittent, then one of the following has a hardware issue:

   1. Motor Cable

   2. Motor

   3. Amplifier Board

3. When the machine is running and in idle, push the affected axis. It should servo to resist motion. If the axis is very easy to push, then one of the following has a hardware issue:

   1. Motor Cable

   2. Motor

   3. Amplifier Board

   Cable

   1. The cable between the Logic Board and Amplifier Board

   2. Logic Board

4. It is also possible for a Stall Fault to occur when the drive or axis is completely jammed up. If the axis is very difficult to push by hand when the machine is off, this is the case.

   • check the lead screw or band drive and contact Micro-Vu support for cleaning instructions

   If clearing the Stall Fault causes another axis to jump (attempt to move): The motor or encoder cables are mixed up between

   axes

   the axis.

   1. Push the

   axes

   1. axis and watch whether the encoder values (LinPosScr) in MotorScope

   correspond correctly.

5. Put the machine in E-Stop and unplug each motor cable in turn to make sure that the braking corresponds correctly.

6. If the Stall Fault stops occurring with certain motors disconnected:

   • There is a short somewhere in the motor, cable or Amplifier Board:

     • With the machine off, check for electrical continuity between the motor leads and the chassis of the machine. It should be an open circuit.

       • If not, there is a short. Unplug the machine immediately and contact the Micro-Vu support!

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A more detailed article for a Excel can be found here:

1. 1. count in the correct axis.

2. If the axis continues to jump (attempt to move) and #4 is not occuring, then verify that the overcurrent LEDs (shown on the Image 1) on the Motor Amplifier board are not red. If any overcurrent LEDs on the Motor Amplifier board are red, then there is likely an electrical short and the following items might be defective:

   1. Cable between motor and Amplifier board

   2. Amplifier board

   3. Motor

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