Parameter Details
12
12.7 L: Protection Functions
YASKAWA SIEPYEULA5001C LA500 Technical Manual 339
■ L7-16: Torque Limit Process at Start
No.
(Hex.)
Name Description
Default
(Range)
L7-16
(044D)
Expert
Torque Limit Process at
Start
Assigns a time filter to allow the torque limit to build at start.
1
(0, 1)
0 : Disabled
There is torque limit at start without a delay time.
Use this setting to maximize the response time when sudden acceleration or deceleration at start is necessary.
1 : Enabled
There is a delay time of 64 ms at start to build the torque limit.
◆ L8: Drive Protection
L8 parameters set protective functions that prevent faults such as overheating, phase loss, and ground faults.
■ L8-02: Overheat Alarm Level
No.
(Hex.)
Name Description
Default
(Range)
L8-02
(04AE)
Expert
Overheat Alarm Level
Sets the oH detection level in temperature.
Determined by o2-04
(50 - 130 °C)
If the heatsink temperature is more than the temperature set in this parameter, the drive detects an overheat pre-
alarm. To enable this function, set one of H2-01 to H2-03 [MFDO Function Select] to 20 [Drive Overheat Pre-
Alarm (oH)].
If the temperature increases to the overheat fault level, the drive will trigger an oH1 [Heatsink Overheat] fault and
stop operation.
■ L8-03: Overheat Pre-Alarm Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-03
(04AF)
Expert
Overheat Pre-Alarm
Selection
Sets operation after the drive detects an oH alarm.
3
(0 - 4)
0 : Ramp to Stop
The drive ramps the motor to stop in the deceleration time. The output terminal set for Fault [H2-01 to H2-03 =
E] activates.
1 : Coast to Stop
The output turns off and the motor coasts to stop. The output terminal set for Fault [H2-01 to H2-03 = E]
activates.
2 : Fast Stop (Use C1-09)
The drive stops the motor in the deceleration time set in C1-09 [Fast Stop Time]. The output terminal set for Fault
[H2-01 to H2-03 = E] activates.
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.
If the overheat pre-alarm is still ON after 10 s, the drive decelerates again. 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
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