YASKAWA AC Drive GA700 High Performance Type Technical Manual
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)
The drive ramps the motor to stop in the deceleration time. Fault relay output terminal MA-MC turns ON, and MB-MC turns OFF.
The output turns off and the motor coasts to stop. Fault relay output terminal MA-MC turns ON, and MB-MC turns OFF.
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.
The keypad shows oH and the drive continues operation. The output terminal set for Alarm [H2-01 to H2-04 = 10] activates.
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 H2-04 = 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 1 shows the output of the alarm and the drive operation at a decreased output frequency.
