Mitsubishi Electric fr-e700 series, Instruction Manual

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Operation setting at alarm occurrence Parameter
6 - 172
6.13.2 Input/output phase failure protection selection (Pr. 251, Pr. 872)
You can disable the output phase failure function that stops the inverter output if one of the inverter
output side (load side) three phases (U, V, W) opens.
Input phase loss protection is a function to stop the inverter output if one of the three phases (R/L1,
S/L2, T/L3) on the inverter's input side is lost.
The above parameters can be set when Pr. 160 "User group read selection" = 0.
햲
Available only for the three-phase power input specification model.
Output phase failure protection selection (Pr. 251)
If phase loss occurs during inverter running (except for during DC brake operation, or output frequen-
cy is 1 Hz or less), output phase loss protection (E.LF) activates, and inverter trips.
When Pr. 251 is set to "0", output phase failure protection (E.LF) becomes invalid.
Input phase failure protection selection (Pr. 872)
When Pr. 872 is set to "1", input phase failure protection (E.ILF) is provided if a phase failure of one
phase among the three phases is detected for 1 s continuously.
Pr. No. Name Initial Value
Setting
Range
Description Parameters referred to
Refer to
Section
251
Output phase failure
protection selection
1
0 Without output phase failure protection
—
1 With output phase failure protection
872
Input phase failure
protection selection
햲
1
0 Without input phase failure protection
1 With input phase failure protection
NOTES
If an input phase failure continues for a long time during inverter operation, the converter section
and capacitor lives of the inverter will be shorter.
If the load is light or during a stop, lost phase cannot be detected because detection is performed
based on the fluctuation of bus voltage. Also, if the power supply voltage is imbalanced, phase
loss is less likely detected.
Phase loss can not be detected during regeneration load operation.
If parameter copy is performed from single-phase power input specification model to three-phase
power input specification model, Pr. 872 setting may be changed. Check Pr. 872 setting after
parameter copy.