12.9 L: Protection Functions
730 YASKAWA SIEPC71061753C GA500 Technical Manual
terminal set for oH Pre-Alarm Reduction Limit [H2-01 to H2-03 = 4D] activates. When the alarm is not output
during deceleration, the drive accelerates until it is at the frequency reference that was applicable before the alarm
was turned off. Figure 12.131 shows the output of the alarm and the drive operation at a decreased output
frequency.
Figure 12.131 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.
Determined by o2-04
(Determined by o2-04)
0 : Disabled
1 : Enabled
The drive measures ripples in DC bus voltage to detect input phase loss.
The drive detects phase loss when power supply phase loss occurs or the main circuit capacitor becomes unusable,
which causes PF [Input Phase Loss] to show on the keypad.
Disable the detection of the input power supply phase loss function in these conditions:
• During deceleration
• The run command is not input
• The output current is less than 30% of the drive rated current.
■ L8-07: Output Phase Loss Protection Sel
No.
(Hex.)
Name Description
Default
(Range)
L8-07
(04B3)
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.
0
(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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