E6581386
F-48
6
6.26.4 Output phase failure detection
: Output phase failure detection mode selection
• Function
This parameter detects inverter output phase failure. If the inverter detects an open phase failure, the
tripping function and the FL relay will be activated. At the same time, the trip information will also
be displayed.
Set = to open the motor-inverter connection by switching commercial power operation to inverter
operation.
Detection errors may occur for special motors such as high-speed motors.
=: No tripping
=: With the power on, the phase failure detection is enabled only at the start of the first operation. The
inverter will trip if the inverter detects an open phase failure.
=: The inverter checks for output phase failures each time it starts operation. The inverter will trip if the
inverter detects an open phase failure.
=: The inverter checks for output phase failures during operation. The inverter will trip if the inverter
detects an open phase failure.
=: The inverter checks for output phase failures at the start of and during operation. The inverter will trip if
the inverter detects an open phase failure.
=: If the inverter detects an open phase failure in every phase, it does not trip but restarts operation when
every phase is reconnected.
The inverter does not check for output phase failures when restarting after a momentary power failure.
Note:A check for output phase failures is made during auto-tuning 1 (=, ), regardless of the setting of this
parameter .
[Parameter setting]
Title Function Adjustment range Default setting
Output phase failure
detection mode
selection
:Deselect
:At starting (only one time after power is turned on)
:At starting (each time power is turned on)
:During operation
:At starting + during operation
:Output cut-off detection enabled
6.26.5 OL reduction starting frequency
: OL reduction starting frequency
⇒ For more details, refer to Section 5.14.
6.26.6 Input phase failure detections
: Input phase failure detection mode selection
• Function
This parameter detects inverter input phase failure. At the occurrence of a phase failure, the
protection message is displayed.
=: No tripping (Failure signal FL deactivated).
=: This parameter detects inverter input phase failure. If the inverter detects an open phase failure, it trips.
[Parameter setting]
Title Function Adjustment range Default setting
Input phase failure detection mode selection :Disabled,:Enabled
Note 1: Setting 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.
Note 2: When using a single-phase direct current to operate the inverter, disable this function (=)
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