Parameter Details
11
11.9 L: Protection Function
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 765
■ L8-11: Heatsink Fan Off-Delay Time
No.
(Hex.)
Name Description
Default
(Range)
L8-11
(04B7)
Heatsink Fan Off-Delay
Time
Sets the length of time that the drive will wait before it stops the cooling fan after it cancels the
Run command when L8-10 = 0 [Heatsink Fan Operation Selection = During Run, w/ L8-11 Off-
Delay].
60 s
(0 - 300 s)
■ L8-12: Ambient Temperature Setting
No.
(Hex.)
Name Description
Default
(Range)
L8-12
(04B8)
Ambient Temperature
Setting
Sets the ambient temperature of the drive installation area.
40 °C
(-10 °C - +50 °C)
The drive automatically adjusts the drive rated current to the best value as specified by the set temperature. Set the
ambient temperature of the area where you install the drive to a value that is more than the drive rating.
■ L8-15: Drive oL2 @ Low Speed Protection
No.
(Hex.)
Name Description
Default
(Range)
L8-15
(04BB)
Drive oL2 @ Low Speed
Protection
Sets the function to decrease the drive overload level at which the drive will trigger oL2 [Drive
Overload] during low speed operation (6 Hz or slower) to prevent damage to the main circuit
transistors.
1
(0, 1)
Note:
Contact Yaskawa or your nearest sales representative before disabling this function at low speeds. If you frequently operate drives with
high output current in low speed ranges, it can cause heat stress and decrease the life span of drive IGBTs.
0 : Disabled (No Additional Derate)
The drive does not decrease the overload protection level.
1 : Enabled (Reduced oL2 Level)
When the drive detects oL2 during low speed operation, it automatically decreases the overload detection level.
At zero speed, the drive derates the overload by 50%.
■ L8-18: Software Current Limit Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-18
(04BE)
Software Current Limit
Selection
Set the software current limit selection function to prevent damage to the main circuit transistor
caused by too much current.
0
(0, 1)
0 : Disabled
When the output current is at the software current limit value, the drive does not restrict the output voltage.
Note:
The drive may detect an oC [Overcurrent] when loads are particularly heavy or the acceleration time is particularly short.
1 : Enabled
When the output current is at the software current limit value, the drive decreases output voltage to decrease
output current.
When the output current decreases to the software current limit level, the drive starts usual operation.
■ L8-19: Freq Reduction @ oH Pre-Alarm
No.
(Hex.)
Name Description
Default
(Range)
L8-19
(04BF)
Freq Reduction @ oH Pre-
Alarm
Sets the ratio at which the drive derates the frequency reference during an oH alarm.
0.8
(0.1 - 0.9)
When these two conditions are correct, this function is enabled:
• L8-03 = 4 [Overheat Pre-Alarm Ope Selection = Run@L8-19 Rate]
• oH alarm is output
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