However, the presence of an IPM code on an amplifier indicates a hardware-level fault that must be addressed first. An IPM is a sophisticated electronic switch within the amplifier that controls the power to your servo motor. An alarm from this module could be due to a few things:
The alarm triggers when the spindle control unit does not receive the expected signals during a switching command.
Check for debris, lack of lubrication, or worn-out bearings that might be causing binding.
Continuous axis movement has frayed the internal copper strands inside the flexible cable tracks. 3. Mechanical Overload fanuc 7115 alarm
Verify that the G signal for the spindle switch ( G-code ) is being sent correctly. 5. Check Spindle Amplifier (SPM)
The insulation inside the servo or spindle motor has broken down, creating a direct short-to-ground.
The FANUC 7115 alarm is a common error code encountered on FANUC-controlled CNC machines. This alarm is related to an overheat condition in the spindle motor or its associated components. When the 7115 alarm is triggered, it indicates that the temperature of the spindle motor has exceeded the predefined limits, which could lead to damage if the machine continues to operate. However, the presence of an IPM code on
Many user alarms are triggered because a sequence failed to finish. After correcting the underlying condition (e.g., freeing a jammed tool arm), you may need to via the operator’s panel or by forcing the PMC (if permitted and safe) before resetting the alarm.
: Bad wiring or loose terminal connections for the 24V signal or the contactor coils. Troubleshooting Steps
Test the relays associated with spindle winding selection. If the 7115 appeared after a recent repair (e.g., an ATC arm brake fix), double-check the wiring for any crossed signals. Ladder Diagnostics: FANUC Ladder3 Check for debris, lack of lubrication, or worn-out
Ensure the gear-shifting mechanism is well-lubricated to prevent mechanical jams.
Ensure that the sensors detecting the gear or spindle range position are clean and functioning. Is this happening during a gear change or right when you the machine?
Any reading below 10 Megohms indicates insulation breakdown or fluid contamination inside the motor or junction box.
A technician modified the system variables ( $PARAM_GROUP.$LOWERLIMS or $UPPERLIMS ) incorrectly, making the software boundaries tighter than necessary.
Navigate to the parameter screen on your FANUC control. Verify that the motor codes (Parameter 2020) and the FSSB setting screens accurately reflect your machine's physical configuration. If you recently replaced a motor, drive, or control card, an unconfigured parameter will immediately trigger this alarm. 3. Check Hardware Diagnostic LEDs