Cell Faults - YASKAWA FSDrive-MV1S Instructions Manual

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.
Fault Display
TMP
[Detail]: nn TEMP
UVB
[Detail]: nn PWR FLT
LIN
[Detail]: nn LINK FLT
FUB
[Detail]: nn FUB FLT
CFA
[Detail]: nn OVR VOLT
[Detail]: nn UDR VOLT
[Detail]: nn CAP FLT
[Detail]: nn COM FLT
[Detail]: nn Qx FLT
* [Detail] shows the detail display on the Digital Operator, and "nn" shows the cell number.
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Table 7.2 List of Cell Faults
Rank Fault Details
Excessive Cell Temperature
F The thermistor attached on the fin detected
90 °C or more.
Control Power supply Fault
F DC bus bar voltage (P-N) was reduced to
300 V or less.
Communications Error (Link fault)
F A communications error in the CCB was
detected.
Power fuse Blown
F
Occurs when the cell input fuse is blown.
F Cell Fault
DC bus bar Overvoltage
DC bus bar voltage was increased to 1075 V
or more.
DC bus bar Undervoltage
DC bus bar voltage was reduced to 475 V or
less.
DC capacitor Overvoltage
Occurs when DC bus bar electrolytic capaci-
tor voltage exceeds 400 V.
Communications Error (Parity error)
Parity check error between the CCB and MB
was detected.
IGBT Qx Fault
Occurs when shortcircuit occurs between the
emitter and collector of IGBT elements Q1
to Q4.
Corrective Actions
• 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.
• Check the cell input voltage.
• Check the cell input power fuse.
• Replace the CCB.
• Check the optic cable, and replace if nec-
essary.
• Replace the CCB.
• Replace the modulator board.
• Replace the fuse.
• Replace the CCB.
• Check the cell input voltage.
• Check the cell input power fuse.
• Replace the CCB.
• Check the cell input voltage.
• Check the cell input power fuse.
• Replace the CCB.
• Check the deterioration of the electrolytic
capacitor, and replace if necessary.
• Check the balance resistance.
• Replace the CCB or cell unit.
• Check the optic cable, and replace if nec-
essary.
• Replace the CCB.
• Replace the modulator board.
• Check the IGBT, and replace if necessary.
• Replace the CCB or cell unit.