12.9 L: Protection Functions
910 YASKAWA SIEPC71061705H GA700 Series Technical Manual
The output turns off and the motor coasts to stop. Fault relay output terminal MA-MC turns ON, and MB-MC
turns OFF.
2 : Fast Stop (Use C1-09)
The drive stops the motor in the deceleration time set in C1-09 [Fast Stop Time]. Fault relay output terminal MA-
MC turns ON, and MB-MC turns OFF.
3 : Alarm Only
The keypad shows oH and the drive continues operation. The output terminal set for Alarm [H2-01 to H2-03 =
10] activates.
4 : Operate at Reduced Speed (L8-19)
The drive decelerates to the level set in L8-19 [Freq Reduction @ oH Pre-Alarm] and continues operation. oH
flashes on the keypad.
oH flashes on the keypad. When the alarm is output, the drive decelerates each 10 seconds. If the drive decelerates
10 times and the alarm continues to be output, the output 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 12.145 shows the output of the
alarm and the drive operation at a decreased output frequency.
Figure 12.145 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.
1
(0, 1)
0 : Disable
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.
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