Haas 131/134 alarm: Tool not clamped / tool clamp fault

Haas detects that the tool is not properly locked or the clamp/unclamp fails. It is an alarm from the Tool change / ATC area, and in the catalog it is listed as “Tool not clamped / tool clamp fault”. On the machine you notice it like this: The ATC does not complete, Tool not clamped, Failure to release or grasp tool.

On the shop floor it almost always comes from one of these causes: Air pressure, Drawbar/piston, Sensor de clamp, Dirty cone/tool. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset only after confirming the tool is securely held. Resetting without fixing the cause first only hides the problem: Haas 131/134 trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Do not start the spindle, Check pressure and cone, Use the ATC recovery procedure if applicable. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Haas 131/134 active, avoid this: Do not bypass safety devices, Do not manipulate energized electrical cabinet, Do not continue producing if the alarm reappears. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If you do not confirm clamp or the tool is trapped. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is critical: there is a real risk of damage to the machine, the tool or a person. Leave the machine stopped, do not keep resetting it to see if it goes away, and call maintenance before producing again. Guidance reference. Always confirm the full text in the exact machine/control manual.