APPENDIX 2 PROTECTIVE AND DIAGNOSTIC
59
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 Meaning Probable Causes Corrective Actions
UV
Dc Bus Undervolt
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
See causes for AUv, FdVe, SrC,
and UV3 faults.
−
OV
Main Circuit Overvoltage
The main circuit DC voltage ex-
ceeded the overvoltage detec-
The regenerative energy from
the motor is too large.
Check the capacity of the power
regenerative unit. (Increase the
capacity.)
Dc Bus Overvolt
tion level.
200 V class : Approx. 400 VDC
400 V class : Approx. 800 VDC
The power supply voltage is too
high.
Decrease the voltage so it is
within specifications.
Heatsink Overheating
The tem
erature of the
ower
The ambient temperature is too
high.
Install a cooling unit.
OH
regenerative unit’s cooling fins
There is a heat source nearby. Remove the heat source.
Heatsink Overtmp
excee
e
t
e sett
ng
n L8-02.
(Stopping method can be
changed by L8-03.)
The cooling fan of the power re-
generative unit has stopped.
Replace the cooling fan. (Con-
tact your YASKAWA representa-
tive.)
OL
Input Over Loaded
Power Regenerative Unit In-
put Overload
Power regenerative unit input
exceeded the overload capacity.
The load is too heavy. Check the size of the load.
EF3
External Fault 3
External fault
(terminal S3-SC)
An external fault was in
ut from
S Reset external fault inputs to
the multi-function inputs.
EF4
External Fault 4
External fault
(terminal S4-SC)
a multi-function input.
S Remove the cause of the exter-
nal fault.
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