Mitsubishi Electric 800 Series Instruction Manual page 242

5.7.6 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 protection
*1 selection
H201
*1 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
Initial value Setting
range
1 0
1
0 0
1
page 458
Description
Without output phase loss protection
With output phase loss protection
Without input phase loss protection
With input phase loss protection
5.7 (H) Protective function parameter
3
4
5
5
5
6
7
8
9
10
241
5. PARAMETERS