Fault display Type Enable Potential causes and corrective actions
xx Device Failure
xx = cell that is faulted
F Fixed Cause
In water-cooled 6SR325, LNG, and HV Cells, a number of conditions are
monitored that put stress on the device. After a combination of additional
events occur after an alarm, or three successive events within 60 seconds,
this fault is set and cannot be cleared. If 20 non-sequential OOS events
occur (or three successive OOS events within 60 seconds) the fault is set.
This fault can also occur if the cell control board is malfunctioning. It is also
set by arc detection, or voltage or current in idle, a CCB watchdog trip, or
bootloader problem.
Sets the "Cell_I" SOP ag.
Action
1. Reset fault to bypass cell to continue running until one of the following
options can be done.
2. Change out cell.
3. Change out device in cell. Reset cell internally (Siemens personnel
only).
xx Control Power
xx = cell that is faulted
F Fixed Cause
MV is okay but control power to the cell is below an acceptable level. One
or more of the control power fuses is blown and / or the DC bus is low
possibly due to power fuses. Not all cells have control power fuses.
Action
1. Check and replace blown cell control fuse or input power fuses.
2. Repair or replace the CCB.
xx IGBT OOS n
n = 1,2,3,4
xx = cell that is faulted
F Fixed Cause
Each gate driver board includes circuits which verify that each IGBT has
fully turned on. This fault might indicate a bad gate driver, an open IGBT,
or a failure in the detection circuitry, i.e. logic low signals on opto-couplers
on gate driver board usually as a result of a Q1, Q2, Q3, or Q4 collector-to-
emitter short in the cell’s power bridge.
Action
Check the cell’s power components and gate driver board.
xx Cap Share
xx = cell that is faulted
F Fixed Cause
A capacitor share fault usually indicates that the voltage shared by the 2 or
3 DC link capacitors in series, is not shared equally, i.e. the voltage on an
individual capacitor in a cell has been detected over 1/2 or 1/3 rated cell DC
bus voltage. This can be caused by a broken bleeder resistor, or wire, or a
failed DC link capacitor (C1 and / or C2).
Action
1. Refer to the Operating Instructions manual.
2. Contact Siemens customer service.
Troubleshooting Faults and Alarms
11.12 Cell Faults and Alarms
NXGPro+ Control Manual
470 Operating Manual, A5E50491925A
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