7
-6
Cell Faults
Cell faults are detected by the control circuit of each Power Cell, and transmitted to the main control section.
If any of these faults occur, it is displayed on the Digital Operator, and the details are recorded in the memory.
* [Detail] shows the detail display on the Digital Operator, and “nn” shows the cell number.
Table 7.2 List of Cell Faults
Fault Display
Rank
Fault Details
Corrective Actions
TMP
F
Excessive Cell Temperature
The thermistor attached on the fin detected
90
°
C or more.
• Check the cooling fan for the controller
panel.
• Check the cooling air amount.
• Clean the intake air filter.
• Check and clean the cell unit.
• Replace the CCB.
• Replace the thermistor or cell unit.
[Detail]
:
nn TEMP
UVB
F
Control Power supply Fault
DC bus bar voltage (P-N) was reduced to
300 V or less.
• Check the cell input voltage.
• Check the cell input power fuse.
• Replace the CCB.
[Detail]
:
nn PWR FLT
LIN
F
Communications Error (Link fault)
A communications error in the CCB was
detected.
• Check the optic cable, and replace if nec-
essary.
• Replace the CCB.
• Replace the modulator board.
[Detail]
:
nn LINK FLT
FUB
F
Power fuse Blown
Occurs when the cell input fuse is blown.
• Replace the fuse.
• Replace the CCB.
[Detail]
:
nn FUB FLT
CFA
F
Cell Fault
[Detail]
:
nn OVR VOLT
DC bus bar Overvoltage
DC bus bar voltage was increased to 1075 V
or more.
• Check the cell input voltage.
• Check the cell input power fuse.
• Replace the CCB.
[Detail]
:
nn UDR VOLT
DC bus bar Undervoltage
DC bus bar voltage was reduced to 475 V or
less.
• Check the cell input voltage.
• Check the cell input power fuse.
• Replace the CCB.
[Detail]
:
nn CAP FLT
DC capacitor Overvoltage
Occurs when DC bus bar electrolytic capaci-
tor voltage exceeds 400 V.
• Check the deterioration of the electrolytic
capacitor, and replace if necessary.
• Check the balance resistance.
• Replace the CCB or cell unit.
[Detail]
:
nn COM FLT
Communications Error (Parity error)
Parity check error between the CCB and MB
was detected.
• Check the optic cable, and replace if nec-
essary.
• Replace the CCB.
• Replace the modulator board.
[Detail]
:
nn Qx FLT
IGBT Qx Fault
Occurs when shortcircuit occurs between the
emitter and collector of IGBT elements Q1
to Q4.
• Check the IGBT, and replace if necessary.
• Replace the CCB or cell unit.
