Input/Output Phase Failure Protection Selection (Pr.251, Pr.872) - Mitsubishi Electric F700 Instruction Manual

3.12.3 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.
The input phase failure protection selection of the inverter input side (R/L1, S/L2, T/L3) can be made valid.
Parameter
Name
Number
Output phase failure protection
251
selection
Input phase failure protection
872
selection
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 140)
(1) Output phase failure protection selection (Pr.251)
⋅
When Pr. 251 is set to "0", output phase failure protection (E.LF) becomes invalid.
(2) 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 1s continuously.
REMARKS
If an input phase failure has occurred when Pr. 872 = "1" (input phase failure protected) and a value other than "0" (power
failure stop function valid) is set in Pr. 261, input phase failure protection (E.ILF) is not provided but power-failure
deceleration is made.
CAUTION
⋅ When an input phase failure occurs in the R/L1 and S/L2 phases, input phase failure protection is not provided but the
inverter output is shut off.
⋅ If an input phase failure continues for a long time, the converter section and capacitor lives of the inverter will be
shorter.
Operation setting at alarm occurrence
Initial Value Setting Range
0
1
1
0
0
1
Description
Without output phase failure
protection
With output phase failure
protection
Without input phase failure
protection
With input phase failure protection
Pr. 250
page 84
Pr. 252
page 127
Pr. 867
page 104
Pr.882
page 208
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