(H) Protective function parameter
342
PARAMETERS
5.10.6 Initiating a protective function
• To initiate a fault (protective function), set the assigned number of the protective function you want to initiate in Pr.997.
• The value set in Pr.997 is not stored in EEPROM.
• When a protective function activates, the inverter trips, a fault is displayed, and a fault signal (ALM, ALM2) is output.
• The latest fault in the faults history is displayed while the fault initiation function is in operation. After a reset, the faults
history goes back to the previous status. (The protective function generated by the fault is not saved in the faults history.)
• Perform inverter reset to cancel the protective function.
• For the selectable parameter by Pr.997 and the corresponding protective functions, refer to page 645.
NOTE
• If a protective function is already operating, no fault can be activated by Pr.997.
• The retry function is disabled when a protective function has been initiated by the fault initiation function.
• If a fault occurs after a protective function has been activated, the protective function indication does not change. The fault is
not saved in the faults history either.
5.10.7 I/O phase loss protection selection
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 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 540
A fault (protective function) is initiated by setting the parameter.
This function can be used to check how the system operates at activation of a protective function.
Pr. Name
Initial
value
Setting
range
Description
997
H103
Fault initiation
9999
16 to 253
The setting range is same with the one for fault data codes of
the inverter (which can be read through communication).
Written data is not stored in EEPROM.
9999
The read value is always "9999".
With this setting, the protective function does not activate.
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
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