E6582062
6-127 6. [Advanced] How to use parameters
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6. 30. 6 Input phase loss detection
<F608: Input phase loss trip>
■ Function
If the phase loss on the inverter input side is detected and an abnormal ripple voltage persists in the
power circuit capacitor for a certain period of time, a trip occurs. The trip display is "EPHI".
■ Parameter setting
■ Difference between the settings
0: Disabled
A trip does not occur. (Failure signal FL disabled)
1: Enabled
If the phase loss is detected during run and an abnormal ripple voltage persists in the power circuit
capacitor for a certain period of time, a trip occurs. (Failure signal FL enabled)
Title Parameter name Adjustment range Default setting
F608 Input phase loss trip 0: Disabled
1: Enabled
1
Important
• In case of light-load operation or if the motor capacity is too small for the inverter capacity, input
phase loss may not be detected.
• If the power supply capacity is too large for the inverter capacity (500 kVA or more, and 10
times or more), detection error may occur. In this case, install an input reactor.
• When <F608> = "0: Disabled", if heavy-load operation continues in the phase loss status on the
input side, the power circuit capacitor of inverter may be damaged.
• To operate the inverter with DC input, set <F608: Input phase loss trip> to "0: Disabled".
• To operate the inverter with DC input with size A4 to A6, set <F640: DC supply input> to "1".
In this case input phase loss detection is disabled independent to F608 setting.
Reference
• How to operate the operation panel -> Refer to [3. 1. 1].
• How to switch display mode on the operation panel -> Refer to [3. 1. 2].
• Procedure to change parameter setting -> Refer to [4. 2. 3]
0.0HzSTOP
13:54
F608 : Input phase loss trip
0: Disabled
1: Enabled
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