Chapter 7 – Fault Tracing
7-6
ACA 635 IGBT Supply Sections
What to Do in Case of
an Earth Fault
Indication
This section describes how to trace the cause of an internal earth fault
indication (Warning/Fault EARTH FAULT) of the ACA 635.
An earth fault indication does not always indicate an actual earth fault.
The indication can sometimes be caused by a faulty IGBT or a faulty
NGDR control board.
SC (INU 1)
Par. 9.01 bit 12
Short-circuit in parallel connected phase
module block 1
Check the fibre optic cables between the NPBU
board channel CH1 and the NINT board of
phase module block 1.
Check the motor and the motor cable.
Check all power plates in the phase module
block 1. If a faulty power plate is detected,
replace the whole phase module.
SC (INU 2)
Par. 9.01 bit 13
Short-circuit in parallel connected phase
module block 2
Check the fibre optic cables between the NPBU
board channel CH1 and the NINT board of
phase module block 2.
Check the motor and the motor cable.
Check all power plates in the phase module
block 2. If a faulty power plate is detected,
replace the whole phase module.
SC (INU 3)
Par. 9.01 bit 14
Short-circuit in parallel connected phase
module block 3
Check the fibre optic cables between the NPBU
board channel CH1 and the NINT board of
phase module block 3.
Check the motor and the motor cable.
Check all power plates in the phase module
block 3. If a faulty power plate is detected,
replace the whole phase module.
SC (INU 4)
Par. 9.01 bit 15
Short-circuit in parallel connected phase
module block 4
Check the fibre optic cables between the NPBU
board channel CH1 and the board of phase
module block 4.
Check the motor and the motor cable.
Check all power plates in the phase module
block 4. If a faulty power plate is detected,
replace the whole phase module.
SUPPLY PHASE
Par. 9.02 bit 0
Missing phase during synchronisation
Check supply fuses.
Check for supply network unbalance.
SYNCHRO FLT
Par. 9.11 bit 13
Synchronisation to supply network is failed.
Supply frequency has changed too much after
ID Run.
Perform the ID Run again. See Parameter
99.07.
USER MACRO
There is no User Macro saved or the file is
defective.
Create the User Macro again.
Fault Messages
Fault Text
Cause
What to do
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