116 Tracing the source of warnings, limits and faults
NAMU / BAMU board in use (grid-side converter control program
IWXR74xx)
If an OVERCURRENT fault or GRID SYNC FAIL fault occurs during the start-up when the
operation of the converter is tested, or if the grid fault ride-through function fails, make the
checks described in the table below.
Action
Check the value of grid-side converter parameter 01.11 MAINS VOLTAGE. Refer to Grid-side control
program for ACS800 wind turbine converters firmware manual [3AUA0000075077 (English)].
If the voltage level is correct, the communication between NAMU / BAMU board and DDCS channel 2
of the grid-side converter control board is OK.
Check the phase sequence of the grid-side converter grid voltage measurement:
Monitor the following grid-side converter signals with DriveWindow Datalogger at 1 ms intervals:
02.22 FLUX X NET ACT (measured signal)
02.23 FLUX Y NET ACT (measured signal)
02.20 FLUX X ACT (converter actual signal)
02.21 FLUX Y ACT (converter actual signal).
Start the Datalogger and trigger it manually. Upload Datalogger information. An example view of the
Datalogger is shown below.
If signals 02.22 FLUX X NET ACT and 02.20 FLUX X ACT are in phase and signals 02.23 FLUX Y
NET ACT and 02.21 FLUX Y ACT are in phase, the measurement phase sequence is OK.
Note: If the signals are not in phase, check the grid voltage measurement cabling of the grid-side
converter NAMU / BAMU board and correct the phase sequence. See the converter hardware
manual.
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