Fanuc | 7115 Alarm

Check insulation resistance between each phase (U to ground, V to ground, W to ground).

The voltage dropped to zero, causing a total loss of position data.

Did this occur during a or during normal production ? Share public link

Find the magnetic contactor in the cabinet. A safe way to trigger the switching is through the machine's MDI mode, as detailed below. fanuc 7115 alarm

Have someone operate the machine while listening for the "click" of the contactors.

If they look incorrect, revert them to factory defaults or expand them slightly to allow for your part clearance. to the controller to apply changes. Step 4: Inspect the Hardware Limit Switch

The spindle amplifier will issue Alarm 15 if more than one second elapses from the transition of a switch request signal until a power line state check signal makes the required transition. Check insulation resistance between each phase (U to

: Manual jogging might still work, but the moment a spindle speed instruction is sent, the system trips hard.

Carefully inspect the wiring to the contactor's coil and the auxiliary contact block. Tighten any loose screws.

When the alarm hits, do this in order:

: Use the robot's "Ping" utility ( [ MENU ] → Setup → Host Comm ) to see if the robot can see the PLC/remote device on the network.

FANUC 7115 alarm is specifically identified as the SPN 1: SP Switch Control Alarm

Disconnect the motor power cables (typically labeled U, V, W) directly from the bottom of the amplifier. Turn the CNC machine back on. Share public link Find the magnetic contactor in

Test your servo and spindle motor insulation yearly to catch degradation before it blows the amplifier.