12.8 L: PROTECTION
798 SIEPYEUOQ2A01G AC Drive Q2A Technical Manual
■ L8-15 oL2@LoSpeed Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-15
(04BB)
oL2@LoSpeed Selection
Sets the function to decrease drive overload at low speeds to prevent damage to the main circuit
transistor during low speed operation (at 6 Hz or slower) to prevent oL2 [Drive Overloaded].
1
(0, 1)
Note:
Contact Yaskawa or your nearest sales representative for consultation before disabling this function at low speeds. Frequent operation of
drives under conditions of high output current in low speed ranges may shorten the service life of the drive IGBT due to heat stress.
0 : Disabled
The drive does not decrease the overload protection level.
1 : Enabled
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 Soft CurrLim Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-18
(04BE)
Soft CurrLim 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 Frq Reduct@oHPre-Alarm
No.
(Hex.)
Name Description
Default
(Range)
L8-19
(04BF)
Frq Reduct@oHPre-Alarm
Sets the ratio at which the drive derates the frequency reference when during an oH alarm.
0.8
(0.1 to 0.9)
When these two conditions are correct, this function is enabled:
• L8-03 = 4 [Overheat Pre-Alarm Selection = Run@L8-19 Rate]
• oH alarm is output
■ L8-20 CF / STPo Selection
No.
(Hex.)
Name Description
Default
(Range)
L8-20
(04C0)
Expert
CF / STPo Selection
Sets operation after the drive detects a CF fault when A1-02 = 4 [Control Method = Adv
OLVector].
Determined by A1-02
(1 - 3)
If you enter a Stop command but it cannot stop drive operation, the drive will detect CF.
1 : Disabled
2 : CF/STPo Detection Enabled
3 : CF ALM/Stop
The drive stops DC injection braking as specified by the value of b2-03 [DCInj Time@Start].
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