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Gripper Moves in Jog Mode But Fails When Program Starts on Polyscope X

How to fix tool power loss due to UR software update on Polyscope X

Context

If your Robotiq gripper responds correctly in Jog or Toolbar mode but fails to activate when the robot program starts, you're likely encountering a recent change introduced in Universal Robots' Polyscope 10.8 update on Polyscope X. This article explains the cause of this behavior and how to resolve it by manually re-enabling the Tool Voltage.

 

Problem Description

You might observe the following:

  • The gripper responds normally when moved using Jog or Toolbar controls.

  • Once you press “Play” to run the robot program, the gripper becomes unresponsive.

  • The issue persists even though the program previously worked without changes.

 

Root Cause: Tool Voltage Disabled by Default

With the UR 10.8 software update, the Tool Output Voltage is no longer automatically set to ON when a program starts. This change causes the Tool Voltage (used by Robotiq grippers) to turn off as soon as you hit "Play", leading to the loss of communication with the gripper.

 

Solution: Manually Enable Tool Voltage

To fix the issue, follow these steps:

  1. On the UR teach pendant, navigate to the Application tab.

  2. Go to the Robot and  Tool I/O section

  3. Locate the Tool Output Voltage setting.

  4. Select the appropriate voltage for your Robotiq gripper (typically 24V).

  5. Press  Save.

This only needs to be done once per cell setup, unless the installation is modified or overwritten.

 

Recommendation

After applying the fix:

  • Restart your program to confirm the gripper functions properly from program start.

  • If using multiple programs or installations, repeat the setting where needed.

     

Conclusion

This issue stems from a change in how Polyscope 10.8 manages tool voltage at startup on Polyscope X. By manually re-enabling the Tool Output Voltage in your application, you can restore normal gripper behavior during program execution.