Causes and corrective actions
137
4
∗1
Resetting the converter initializes the internal cumulative heat value of the electronic thermal relay function.
Converter indication
E.B
FR-PU07
indication
Stedy Spd OV
FR-PU07
indication
(Alarm Hist)
OVT
FR-DU08
indication
E.OVT
Name
Overvoltage trip
Description
If the converter's internal main circuit DC voltage reaches or exceeds the specified value, the protective
circuit is activated to stop the outputs of the converter. The circuit may also be activated by a surge voltage
produced in the power supply system.
Check point
• Check for sudden load change and excessive regeneration.
• Check that any power supply failure did not occur.
Corrective action
• Keep the load stable.
• Check the power supply.
Converter indication
E.C
FR-PU07
indication
Inv. Overload
FR-PU07
indication
(Alarm Hist)
THT
FR-DU08
indication
E.THT
Name
Overload trip (electronic thermal relay function)
Description
For the protection of transistor, electronic thermal relay activates in inverse-time characteristics against the converter
input to stop the output of the converter.
Check point
• Check the motor for the use under overload.
• Check that the total capacity of the inverters used is not larger than the capacity of the converter.
Corrective action
• Reduce the load.
• Reconsider the configuration of the inverters for the converter.
Converter indication
E.D
FR-PU07
indication
H/Sink O/Temp
FR-PU07
indication
(Alarm Hist)
FIN
FR-DU08
indication
E.FIN
Name
Heatsink overheat
Description
When the heatsink overheats, the temperature sensor activates, and the converter output is stopped.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink overheat
protection operation temperature.
For the terminal used for the FIN signal output, assign the function by setting "10 (positive logic) or 110
(negative logic)" in
Pr.11, Pr.12, and Pr.16 (Output terminal function selection)
. (Refer to
).
Check point
• Check for too high surrounding air temperature.
• Check for heatsink clogging.
• Check that the cooling fan is not stopped. (Check that "
" is not displayed on the operation status 7-
segment LED display of the converter.)
Corrective action
• Set the surrounding air temperature to within the specifications.
• Clean the heatsink.
• Replace the cooling fan.
Converter indication
E.E
FR-PU07
indication
Inst. Pwr. Loss
FR-PU07
indication
(Alarm Hist)
IPF
FR-DU08
indication
E.IPF
Name
Instantaneous power failure
Description
When a power failure occurs (or when power input to the converter is shut off), the instantaneous power failure
protection function activates to stop the output of the converter and prevent the control circuit from malfunctioning.
If a power failure persists for 100 ms or longer, the fault output is not provided, and the converter and the inverter
restart if the start signal is ON upon power restoration. (The converter and the inverter continues operating if an
instantaneous power failure is within 10 ms.) In some operating status (load magnitude, acceleration/deceleration
time setting of the inverter, etc.), overcurrent or other protection may be activated upon power restoration.
The IPF signal is output when a power failure is detected. (Refer to
.)
Check point
Find the cause of the instantaneous power failure occurrence.
Corrective action
• Remedy the instantaneous power failure.
• Prepare a backup power supply for instantaneous power failure.
• Set the function of automatic restart after instantaneous power failure
(Pr.57)
. (Refer to
).
Summary of Contents for FR-XC-11K
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