Input/Output Phase Failure Protection Selection (Pr. 251, Pr. 872) - Mitsubishi Electric FR-A700 Instruction Manual

Operation setting at alarm occurrence
6.17.3

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.
Pr.
Name
No.
Output phase failure
251
protection selection
Input phase failure
872
protection selection
Output phase failure protection selection (Pr. 251)
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 1s continuously.
NOTES 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.
When an input phase failure occurs in the R/L1 and S/L2 phases, input phase failure protec-
tion is not provided but the inverter output is shut off.
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.
6 - 356
Initial Setting
Description
Value Range
0 Without output phase failure protection
1
1 With output phase failure protection
0 Without input phase failure protection
0
1 With input phase failure protection
Parameter
Refer to
Parameters referred to
Section
261 Power failure stop 6.16.2
selection