Mitsubishi Electric 800 Series, Instruction Manual, Page: 327 / 727

(H) Protective function parameter
326
PARAMETERS
5.10.6
I/O phase loss protection selection

The setting is available only for standard 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)
• When Pr. 872 = "1", input phase loss (E.ILF) protection will be activated if one of three phases is detected to be lost for 1 s
continuously.
NOTE
• 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 526
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. 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