Mitsubishi Z7*/Z8* alarm: Absolute position or coded scale alarm

Mitsubishi reports problem with absolute position system or coded reference scale. It is an alarm from the Encoder / measurement area, and in the catalog it is listed as “Absolute position or coded scale alarm”. On the machine you notice it like this: Absolute reference loss, Fault while homing, Alarm after battery or encoder.

On the shop floor it almost always comes from one of these causes: Absolute battery, Encoder/escala, Wiring, Lost position data. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after reference/repair according to manual. Resetting without fixing the cause first only hides the problem: Mitsubishi Z7*/Z8* 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 complete Z code, Do not move automatically until reference is recovered, Seguir procedimiento de absolute position. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Mitsubishi Z7*/Z8* 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 need to restore absolute position or calibrate scale. 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.