Mitsubishi Electric FR-E800, Instruction Manual

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11. (H) Protective Function Parameters
11.6 I/O phase loss protection selection
11.6
I/O phase loss protection selection
The output phase loss protection function, which stops the inverter output if one of the three phases (U, V, W) on the inverter's
output side (load side) is lost, can be disabled.
The input phase loss protective function on the inverter input side (R/L1, S/L2, T/L3) can be disabled.
*1 Available for the three-phase power input model only.
 Output phase loss protection selection (Pr.251)
• When Pr.251 is set to "0", output phase loss protection (E.LF) becomes invalid.
 Input phase loss protection selection (Pr.872)
• When Pr.872 is set to "1", Input phase loss (E.ILF) protection is activated if one of three phases is detected to be lost for
1 second continuously.
NOTE
• When several motors are connected, output phase loss cannot be detected even if the wiring to one motor loses phase.
• In the case of R/L1, S/L2 phase loss, the input phase loss protection does not operate, and the inverter output is shut off.
• If an input phase loss continues for a long time, the lives of converter section and capacitor of the inverter become 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. Large unbalanced phase-to-phase voltage of the three-phase power supply may also cause input phase loss
protection (E.ILF).
• Phase loss cannot be detected during regeneration load operation.
Parameters referred to
Pr.261 Power failure stop selection  page 414
Pr. Name Initial value Setting range Description
251
H200 Output phase loss
protection selection
1
0 Output phase loss protection disabled
1 Output phase loss protection enabled
872
H201
*1
Input phase loss
protection selection
1
0 Input phase loss protection disabled
1 Input phase loss protection enabled