|Symptom / Alarm
|Alarm 552 TRIPPED CIRCUIT BREAKER
||There is an current overload or short-circuit detected at the power distribution PCB. One or more circuit breakers is not installed correctly.
||Check the Power Distribution PCB. Make sure the circuit breakers are properly seated.
|The TSC jumper JP2 is missing.
||On machines without TSC/HPC circuit breaker jumper JP2 must be installed.
|A short-circuit detected on CB3 coolant pump breaker, CB3 tripped.
- Check 240VAC cable from PSUP (P9) to I/O PCB (P30). Make sure that cable is not pinched. Make sure that cabled is wired correctly.
- Check the 240VAC cable from I/O (P29) to coolant pump amphenol. Make sure the cable is not pinched. Make sure that cable is wired correctly.
- Disconnect the connector from I/O PCB (P29) and check red and black wire to ground they should read open (O.L).
- Check for short-circuit on coolant pump/cable. Refer to the: Standard Coolant - System - Troubleshooting Guide
|(Single-phase machines only), Alarm 552 TRIPPED CIRCUIT BREAKER occurs when the coolant pump gets commanded to turn on.
Note: The circuit breaker did not trip.
|The 240 VAC input cable connected to the PSUP at P11 is not correct.
||Turn off the main breaker and disconnect 240 VAC input cable from the PSUP at P11 and swap the white and black wire positions on the cable.
|Alarm 9101 RESETTABLE SOFTWARE ERROR
||One or more circuit breakers is turned OFF.
||Check the Power Distribution PCB. Find the cause of the short-circuit then turn the circuit breaker back on.
Alarm 175 GROUND FAULT DETECTED
Alarm 9803 120VAC GROUND FAULT
Alarm 9804 240 VAC GROUND FAULT
|There is a short circuit in one of the 115 / 230 VAC components. Spindle motor/cable and Axis motors/cables as well.
||Refer to the Next Generation Control - I/O PCB - Troubleshooting Guide.
|Alarm 9902 GROUND FAULT
||One of the PSUP circuit breakers is not installed correctly.
||Check all the circuit breakers tabs to make sure they are installed inside the female tabs.
Alarm 840 INCOMING AC LINE VOLTAGE TOO LOW DURING POWER UP
or the AC Line Voltage gauge is not showing the correct reading.
|There is a problem with the incoming voltage. The voltage monitor circuit on the power card PCB is not outputting the correct reference voltage.
||Check the incoming voltage and make sure the transformer taps are in the correct location. Make sure the PFDM on PSUP PCB is putting the correct reference voltage to NGC Main PCB.
|The Power Card was replaced with a REV - P but the patch file was not installed or the software upgraded.
||If the machine has a 4075-N and software version lower than 100.16.000.1040 you must install a patch to change parameter 2009 before you install the replacement PSUP PCB. Failure to do so will cause then machine to shut down immediately upon power up.
If you are replacing a 4075-P with a 4075-P no patch is required.
Refer to: Next Generation Control - Patch File Load/Uninstall
If you install the 4075-P on a machine with software lower than 100.16.000.1040 and did not applied the patch, you must do a clean software installation. Refer to
Next Generation Control - Software Download and Update - Clean Installation
|The machine will not turn on.
||The F1 fuse is blown.
||Check F1 fuse, check the JP1 jumper to be installed if the machine has a High Voltage service input (380-480 VAC).
|There is problem with the power on/off circuit.
||Refer to: Next Generation Control - Power On/Off Circuit, Main Transformer - Troubleshooting Guide.