Okuma 5220 alarm: Servo communication error

Okuma OSP detects communication failure with servo/drive. It is an alarm from the Servo / ejes area, and in the catalog it is listed as “Servo communication error”. On the machine you notice it like this: The axis does not enable, Communication alarm, May affect several axes.

On the shop floor it almost always comes from one of these causes: Communication cable, Drive without power, Servo module, Noise or loose connection. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after reestablishing communication. Resetting without fixing the cause first only hides the problem: Okuma 5220 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: Note axis/subcode, Revisar alarmas de drive, Do not handle energised connectors. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Okuma 5220 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.

Always, if it persists or affects several axes. 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.