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2.2
MINOR FAULT DETECTION
Minor faults are a type of the protection function that do not operate the fault contact
output and are automatically returned to their original status once the cause of the
minor fault has been removed.
The Digital Operator display blinks.
Take appropriate countermeasures according to the table below.
Table A-4 Minor Fault Displays and Processing
Minor Fault Display
UV
Dc Bus Undervolt
OV
Dc Bus Overvolt
D B
O
lt
OH
Heatsink Overtmp
OL
Input Over Loaded
EF3
External Fault 3
EF4
External Fault 4
Meaning
Main Circuit Undervoltage
The main circuit DC voltage
was below the undervoltage
detection level (L2-05).
200 V class : Approx. 190 VDC
or less
400 V class : Approx. 380 VDC
or less
Main Circuit Overvoltage
The main circuit DC voltage ex-
ceeded the overvoltage detec-
g
tion level.
ti
l
l
200 V class : Approx. 400 VDC
400 V class : Approx. 800 VDC
Heatsink Overheating
The temperature of the power
The temperature of the power
regenerative unit's cooling fins
exceeded the setting in L8-02.
exceeded the setting in L8 02
(Stopping method can be
changed by L8-03.)
Power Regenerative Unit In-
put Overload
Power regenerative unit input
exceeded the overload capacity.
External fault
(terminal S3-SC)
External fault
(terminal S4-SC)
APPENDIX 2 PROTECTIVE AND DIAGNOSTIC
Probable Causes
See causes for AUv, FdVe, SrC,
and UV3 faults.
The regenerative energy from
the motor is too large.
The power supply voltage is too
high.
The ambient temperature is too
high.
There is a heat source nearby.
The cooling fan of the power re-
generative unit has stopped.
The load is too heavy.
An external fault was input from
An external fault was input from
a multi-function input.
Corrective Actions
−
Check the capacity of the power
regenerative unit. (Increase the
capacity.)
Decrease the voltage so it is
within specifications.
Install a cooling unit.
Remove the heat source.
Replace the cooling fan. (Con-
tact your YASKAWA representa-
tive.)
Check the size of the load.
S Reset external fault inputs to
the multi function inputs.
the multi-function inputs.
S Remove the cause of the exter-
nal fault.
59
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