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E6581381
F-59
6
6.17.6 Input phase failure detection
H : Input phase failure detection mode selection
• Function
This parameter detects inverter input Phase failure. If the abnormal voltage status of main circuit
capacitor persists for few minutes or more, the tripping function and the FL relay will be activated.
Therefore, input phase failures cannot always be detected. A trip information GRJK will be
displayed.
If the power capacity is larger than the inverter capacity (more than 200kVA or more than 10 times),
detection errors may occur. If this actually happens, install an input AC reactor.
H=: No tripping (Failure signal FL not activated)
H=: Phase failure detection is enabled during operation. The inverter will trip if the abnormal voltage
status of main circuit capacitor persists for ten minutes or more. (Failure signal FL activated)
Title Function Adjustment range Default setting
H
Input phase failure detection mode
selection
0: Disabled, 1: Enabled 1
Note: Setting H to (input phase failure detection: disabled) may result in a breakage of the
capacitor in the inverter main circuit if operation is continued under a heavy load in spite of the
occurrence of an input phase failure.
6.17.7 Control mode for small current
H : Small current detection current hysteresis
H
: Small current trip/alarm selection
H
: Small current detection current
H
: Small current detection time
• Function
The H parameter allows the inverter to be tripped if a current smaller than the H-
specified value flows for more than the H-specified time. When tripping is selected, enter the
detection time to tripping. Trip information is displayed as "WE".
H=: No tripping (Failure signal FL not activated).
A small current alarm can be put out by setting the output terminal function selection parameter.
H=: The inverter will trip (Failure signal FL activated) if a current below the current set with H
flows for the period of time specified with H.