5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 297
L8-05: Input Phase Loss Protection Selection
Enables or disables the input phase loss detection.
Setting 0: Disabled
Setting 1: Enabled
Enables input phase loss detection. As detection is performed by measuring the DC bus ripple, a phase loss fault (PF) can
also be triggered by a power supply voltage imbalance or main circuit capacitor deterioration. Detection is disabled if:
• The drive is decelerating.
• No Run command is active.
• Output current is less than or equal to 30% of the
drive rated current.
L8-07: Output Phase Loss Protection Selection
Enables or disables the output phase loss detection.
Note: 1. Output phase loss detection can mistakenly be triggered if the motor rated current is very small compared to the drive rating. Disable
this parameter in such cases.
2. Output phase loss detection is not possible when the drive is running a PM motor with light load.
Setting 0: Disabled
Setting 1: Fault when o
ne phase is lost
An output phase loss fault (LF) is triggered when the output current for any phase U, V, or W drops to 5% or less of the
drive rated current.
When using a PM motor, this is applicable
when the output current is 30% or higher of the drive rated current.
When using an IM motor, this is applicable when t
he output current is 5% or higher of the drive rated current.
Setting 2: Fault when two phases are lost
An output phase loss fault (LF) is triggered when the output current for phases U, V, and W all drop to 5% or less of the
drive rated current.
The output shuts off and the motor coasts to stop.
L8-09: Output Ground Fault Detection Selection
Enables or disables the output ground fault detection.
Setting 0: Disabled
Ground faults are not detected.
Setting 1: Enabled
A ground fault (GF) is triggered when high leakage current or a ground short circuit occurs in one or two output phases.
L8-10: Heatsink Cooling Fan Operation Selection
Selects the heatsink cooling fan operation.
Setting 0: Run with timer
The fan is switched on when a Run command is active. It is switched off with the delay set in parameter L8-11 after the
Run command has been released. Using this setting extends the fan lifetime.
Setting 1: Run always
The fan runs whenever power is supplied to the drive.
No. Name Setting Range Default
L8-05 Input Phase Loss Protection Selection 0 or 1 1
No. Name Setting Range Default
L8-07 Output Phase Loss Protection Selection 0 to 2 0
No. Name Setting Range Default
L8-09 Output Ground Fault Detection Selection 0 or 1 1
No. Name Setting Range Default
L8-10 Heatsink Cooling Fan Operation Selection 0 or 1 0
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