YASKAWA HV600 Technical Reference page 342

5.8 L: Protection Functions
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L8-03: Overheat Pre-Alarm Selection
No.
Name
(Hex.)
L8-03 Overheat Pre-Alarm
Selection
(04AF)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration time. Fault relay output terminal MA-MC activates and MB-MC
deactivates.
1 : Coast to Stop
The output turns off and the motor coasts to stop. Fault relay output terminal MA-MC turns activates and MB-MC
deactivates.
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
activates and MB-MC deactivates.
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.
operation at a decreased output frequency.
H2-xx = 4D: oH Pre-Alarm Reduction Limit
L8-19: Freq Reduction @ oH Pre-Alarm
Figure 5.88 Drive Operation at a Decreased Output Frequency when the Overheat Alarm is Output
*1 If the oH alarm continues after 10 reduction cycles, the terminal set for H2-xx = 4D [oH Pre-Alarm Reduction Limit] will activate.
Note:
• The drive will use the largest value of Y1-06 [Minimum Speed], Y4-12 [Thrust Frequency], or d2-02 [Frequency Reference Lower Limit] as
the lower limit for output frequency.
• Parameter L8-97 [Carrier Freq Reduce during OH] enables and disables the carrier frequency reduction during oH pre-alarm.
342
Sets drive operation if it detects an oH alarm.
Description
Figure 5.88 shows the output of the alarm and the drive
oH Alarm: Heatsink Overheat
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Default
(Range)
4
(0 - 4)