I/O Phase Loss Protection Selection - Mitsubishi Electric 800 Series Instruction Manual

(H) Protective function parameter
5.10.6

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 enabled.
Pr. Name
251 Output phase loss
H200 protection selection
872 Input phase loss
H201 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
326
PARAMETERS
Initial Setting
value range
0
1
1
0
0
1
page 526
Description
Without output phase loss protection
With output phase loss protection
Without input phase loss protection
With input phase loss protection