1318 HEIDENHAIN Technical Manual iTNC 530 HSCI
Automated testing 
of drives
Faults caused by excessive leakage current or ground fault are detected only 
by the UV(R) power supply unit, although the fault can also be triggered by one 
of the connected power modules. The power modules must not be 
disconnected for fault finding, however. It is sufficient to deactivate one axis 
after the other using MP10 in order to find the axis or the power module 
causing the leakage-current fault.
Information Meaning Colors
Phase 1, Phase 2, 
Phase 3
Status of the phases in the 
motor and the supply line
 Green: Phase is OK
 Red: Phase error
Leakage current Information on a short circuit 
to ground in the motor, the 
power module or in the 
supply line
 Green: No ground fault
 Red: Ground fault 
detected
Power module Status of the power module  Green: Power module 
is OK
 Red: Power module 
error
Supply unit Status of the supply unit  Green: Supply unit OK
 Red: Supply unit error
Connection Status of the connection 
control ↔ power module
 Green: Connection is 
OK
 Red: Connection error