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

4.13.3 Input/output phase failure protection selection (Pr. 251, Pr. 872)

You can disable the output phase protection 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 156)
(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.
♦ Parameters referred to ♦
Pr. 261 Power failure stop selection
Initial Value
1
0
Refer to page 130
Operation setting at alarm occurrence
Setting Range
0 Without output phase failure protection
1 With output phase failure protection
0 Without input phase failure protection
1 With input phase failure protection
Description
135
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