12.7 L: Protection Functions
340 YASKAWA SIEPYEULA5001C LA500 Technical Manual
was turned off. Figure 12.34 shows the output of the alarm and the drive operation at a decreased output
frequency.
Figure 12.34 Drive Operation at a Decreased Output Frequency when the Overheat Alarm is Output
■ L8-05: Input Phase Loss Protection Sel
No.
(Hex.)
Name Description
Default
(Range)
L8-05
(04B1)
Input Phase Loss Protection
Sel
Sets the function to enable and disable input phase loss detection.
Depends on o2-04
(0 - 2)
0 : Disable
1 : Enabled
2 : Standard + dv/dt
■ L8-06: Input Phase Loss Detection Level
No.
(Hex.)
Name Description
Default
(Range)
L8-06
(04B2)
Input Phase Loss Detection
Level
When ripple is observed in the DC bus, expansion of the input bias is calculated and becomes the
input phase if the difference between the max and minimum values of the ripple are greater than
L8-06.
Determined by o2-04
(0.0 - 50.0%)
100% detection level = voltage (200Vor 400 V) × √2
■ L8-07: Output Phase Loss Protection Sel
No.
(Hex.)
Name Description
Default
(Range)
L8-07
(04B3)
Expert
Output Phase Loss
Protection Sel
Sets the function to enable and disable output phase loss detection. The drive starts output phase
loss detection when the output current decreases to less than 5% of the drive rated current.
1
(0 - 2)
Note:
The drive can incorrectly start output phase loss detection in these conditions:
• The motor rated current is very small compared to the drive rating.
• The drive is operating a PM motor with a small load.
0 : Disabled
1 : Fault when one phase is lost
If the drive loses one output phase, it will trigger LF [Output Phase Loss].
The output turns off and the motor coasts to stop.
2 : Fault when two phases are lost
If the drive loses more than one output phase, it will trigger LF [Output Phase Loss].
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