Okuma 1151 alarm: MCS: error detected in inverter

Okuma OSP detects failure in the servo/spindle inverter (overcurrent, DC bus, cooling, etc.). It is an alarm from the Servo / ejes area, and in the catalog it is listed as “MCS: error detected in inverter”. On the machine you notice it like this: Axis/spindle does not enable, Alarm when energizing or under load, It usually comes with the inverter subcode.

On the shop floor it almost always comes from one of these causes: Damaged encoder cable, Motor cortocircuito, Inverter with an internal fault, Inverter cooling. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after inverter diagnosis. Resetting without fixing the cause first only hides the problem: Okuma 1151 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: Write down 1151 and subcode, Check LEDs/inverter ventilation, Do not re-energise repeatedly. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Okuma 1151 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.

Siempre. 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.