Parameter Details
12
12.8 L: PROTECTION
SIEPCYEUOQ2V01A Q2V Technical Manual 671
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.
Refer to Derating Depending on Ambient Temperature on page 303 for information about derating as specified by
ambient temperature.
■ 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 the manufacturer 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
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.
1
(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 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 Selection = Run@L8-19 Rate]
• oH alarm is output
■ L8-27: OverCurr Det Gain
No.
(Hex.)
Name Description
Default
(Range)
L8-27
(04DD)
OverCurr Det Gain
Sets the PM motor overcurrent detection level as a percentage of the motor rated current value.
300.0%
(0.0 - 1000.0%)
Note:
• If the setting value for L8-27 is the same or almost the same as the setting value for L7-xx [Torque Limit], the drive can detect oC2
[Overcurrent2].
• This function is disabled when you set L8-27 = 0.0. Under usual circumstances, do not set L8-27 = 0.0.
• If the drive rated current is much higher than the motor rated current, PM motor magnets can demagnetize when current flows at the
drive overcurrent detection level. When you set a low overcurrent detection level to prevent PM motor demagnetization, make sure that
you adjust L8-27.
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