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5. PARAMETERS
5.7 (H) Protective function parameter
3
4
5
5
5
6
7
8
9
10
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.
*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.
Pr.261 Power failure stop selection page 458
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
*1
Input phase loss protection
selection
0 0 Without input phase loss protection
1 With input phase loss protection
Parametersreferredto
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