Mitsubishi Electric FR-A800, Instruction Manual

Page: 486 / 1042

(H) Protective function parameter Parameters
5 - 306
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.
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.
Pr. Name
Initial
value
Setting
range
Description
251
H200
Output phase loss
protection selection
1
0 Without output phase loss protection
1 With output phase loss protection
872
H201
Input phase loss
protection selection
0
0 Without input phase loss protection
1 With input phase loss protection
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 Power failure stop selection => page 5-580