Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 999
■ L8-03: Overheat Pre-Alarm Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-03
(04AF)
Overheat Pre-Alarm
Selection
Sets the operation of drives when an oH alarm is detected.
3
(0 - 4)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration time. Fault relay output terminal MA-MC turns ON, and MB-
MC turns OFF.
1 : Coast to Stop
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 12.142 shows the output of the alarm and the
drive operation at a decreased output frequency.
Figure 12.142 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
(0 - 4)
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