Fanuc 7115 Alarm _top_ Review

Seeing 7115 ILLEGAL COMMAND on your FANUC control (especially on Series 0i, 16i, 18i, 21i, or 31i) can feel like a dead end. But don’t panic. In 90% of cases, it’s a simple fix—not a broken servo or a dead motherboard.

: Manually check if the Hi/Lo switching contactors are physically pulling in or if they show signs of charring. fanuc 7115 alarm

: Some users report that a full power down and restart can clear intermittent faults, though persistent 7115 alarms typically indicate a hardware failure. Seeing 7115 ILLEGAL COMMAND on your FANUC control

If these steps do not resolve the issue, you may need to contact a FANUC repair specialist to test the spindle amplifier or replace the logic board. : Manually check if the Hi/Lo switching contactors

(often Izumi brand) located in the electrical cabinet. Even if they show 24V on a multimeter, they may be failing under load or causing ripple issues. Contactor Issues : The alarm can be triggered by faulty hi/lo spindle contactors . Inspect these for mechanical binding or burnt contacts. Feedback/Resolver Errors