Okuma 4110/8507/8583/8601 alarm: Clamp/unclamp or ATC arm fault

Okuma detects clamp/unclamp failure, associated automatic lubrication or ATC arm overload/failure. It is an alarm from the Tool change / ATC area, and in the catalog it is listed as “Clamp/unclamp or ATC arm fault”. On the machine you notice it like this: Tool change stopped, The ATC arm does not complete its cycle, Tool clamp/unclamp does not confirm.

On the shop floor it almost always comes from one of these causes: Sensor clamp, Air/hydraulic pressure, Inverter/motor ATC, ATC lubrication. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Use the Okuma ATC recovery procedure. Resetting without fixing the cause first only hides the problem: Okuma 4110/8507/8583/8601 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 put your hands in the ATC, Register position, Check pressure and sensors. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Okuma 4110/8507/8583/8601 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 it is halfway through or does not confirm the tool. 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.