2 minor fault detection – Yaskawa RC5 Converter User Manual
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YASKAWA ELECTRIC TOEP C710656 01C YASKAWA - RC5 Instruction Manual
6.2 Minor Fault Detection
6.2
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 6.2 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
Dc Bus Overvolt
Main Circuit Overvoltage
The main circuit DC voltage exceeded
the overvoltage detection level.
200 V class: Approx. 400 VDC
400 V class: Approx. 800 VDC
The regenerative energy from the motor
is too large.
Check the capacity of the power
regenerative unit. (Increase the
capacity.)
The power supply voltage is too high.
Decrease the voltage so it is within
specifications.
OH
Heatsink Overtmp
Heatsink Overheating
The temperature of the power
regenerative unit’s cooling fins
exceeded the setting in L8-02.
(Stopping method can be changed by
L8-03.)
The ambient temperature is too high.
Install a cooling unit.
There is a heat source nearby.
Remove the heat source.
The cooling fan of the power
regenerative unit has stopped.
Replace the cooling fan. (Contact your
YASKAWA representative.)
OL
Input Over Loaded
Power Regenerative Unit Input
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 input from a
multi-function input.
• Reset external fault inputs to the
multi-function inputs.
• Remove the cause of the external
fault.
EF4
External Fault 4
External fault (terminal S4-SC)