I/O Phase Loss Protection Selection - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
5.10.7

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 enabled.
Pr.
251
H200
872
H201
The setting is available only for standard models and IP55 compatible models.
Output phase loss protection selection (Pr. 251)
● When Pr. 251 = "0", output phase loss (E.LF) protection is disabled.
Input phase loss protection selection (Pr. 872) (Standard models and IP55 compatible models)
When Pr. 872 = "1", input phase loss (E.ILF) protection will be activated if one of three phases is de-
tected to be lost for 1 s continuously.
NOTES When several motors are connected, output phase loss cannot be detected even if the wiring to
one motor loses phase.
If an input phase is lost while Pr. 872 = "1" (with input phase loss protection), Pr. 261 "Power failure
stop selection" ≠ "0" (power failure stop function enabled), the motor decelerates to stop without
outputting E.ILF.
In the case of R/L1, S/L2 phase loss, the input phase loss protection will not operate, and the
inverter will trip.
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
FR-A800
Name
Output phase loss
protection selection
Input phase loss
protection selection
Power failure stop selection
Initial Setting
Description
value range
0 Without output phase loss protection
1
1 With output phase loss protection
0 Without input phase loss protection
0
1 With input phase loss protection
(H) Protective function parameter
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