157
Operation setting at fault occurrence
4.13.3 Input/output phase loss protection selection (Pr. 251, Pr. 872)
(1) Output phase loss protection selection (Pr. 251)
When Pr. 251 is set to "0", output phase loss protection (E.LF) becomes invalid.
(2) Input phase loss protection selection (Pr. 872)
When Pr. 872 is set to "1", input phase loss protection (E.ILF) is provided if a phase loss of one phase among the
three phases is detected for 1s continuously.
You can disable the output phase loss protection function that stops the inverter output if one phase of the
inverter output side (load side) three phases (U, V, W) is lost.
The input phase loss protection selection of the inverter input side (R/L1, S/L2, T/L3) can be valid.
Parameter
Number
Name Initial Value Setting Range Description
251
Output phase loss protection
selection
1
0 Without output phase loss protection
1 With output phase loss protection
872
Input phase loss protection
selection
0
0 Without input phase loss protection
1 With input phase loss protection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 185)
REMARKS
If input phase is lost when Pr. 872 = "1" (with input phase loss protection) and Pr. 261 "0" (power failure stop function valid),
input phase loss protection (E.ILF) is not provided but power-failure deceleration is made.
CAUTION
When an input phase loss occurs in the R/L1 and S/L2 phases, input phase loss protection is not provided but the inverter
output is shut off.
If an input phase loss continues for a long time, the converter section and capacitor lives of the inverter will be shorter.
Parameters referred to
Pr. 261 Power failure stop selection Refer to page 151
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