The 7115 alarm is rarely a "ghost" alarm. It has physical causes that fall into four main categories.
When you command a move (e.g., G01 X100.0), the CNC creates a "command position" trajectory. The servo amplifier drives the motor, and the encoder (pulse coder) attached to the motor shaft sends back "feedback position" pulses. fanuc 7115 alarm
: Manually check if the high/low gear contactors are pulling in. If they are functional but the error persists, the feedback circuit may be the issue. Verify Related Alarms : If the 7115 alarm is accompanied by EX0099 (Panel Alarm) 449 (IPM Alarm) The 7115 alarm is rarely a "ghost" alarm
This sets the spindle serial protocol version. If you replaced a spindle amplifier with a newer or older model, this bit must match. Try toggling it (0→1 or 1→0) with the machine powered off and on. The servo amplifier drives the motor, and the
, indicates a failure in the spindle switching sequence or control circuit. This alarm typically occurs on machines with spindle speed switching (high/low gear) when the CNC controller detects that the switching contactors did not pull in correctly during power-on or operation. Core Causes and Diagnosis Failed 24VDC Power Supplies
Inspect the DCS Status ScreenGo to [MENU] -> [SETUP] -> [DCS]. Check the "Safe I/O status." This screen displays the real-time state of both Channel 1 and Channel 2 for all safety inputs. Look for any line where one column shows "OFF" and the other shows "ON." This is your point of failure.
More specifically, alarm indicates that the servo amplifier's internal current sensor circuit has failed or is providing an abnormal A/D (Analog-to-Digital) conversion value.