YASKAWA CIPR-GA50C series Technical Manual page 706

12.9 L: Protection Functions
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L8-15: Drive oL2 @ Low Speed Protection
No.
Name
(Hex.)
L8-15 Drive oL2 @ Low Speed
Protection
(04BB)
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 (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%.
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L8-18: Software Current Limit Selection
No.
Name
(Hex.)
L8-18 Software Current Limit
Selection
(04BE)
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.
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L8-19: Freq Reduction @ oH Pre-Alarm
No.
Name
(Hex.)
L8-19 Freq Reduction @ oH Pre-
Alarm
(04BF)
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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L8-27: Overcurrent Detection Gain
No.
Name
(Hex.)
L8-27 Overcurrent Detection Gain
(04DD)
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].
• On drives with software versions PRG:1022 and later, this function is disabled when you set L8-27 = 0.0. Under usual circumstances,
do not set L8-27 = 0.0. The "PRG" column on the nameplate on the right side of the drive identifies the software version. You can also
use U1-25 [Software Number] to identify the software version.
• 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.
706
V/f OLV OLV/PM OLV/PM AOLV/PM EZOLV
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].
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Set the software current limit selection function to prevent damage to the main circuit transistor
caused by too much current.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the ratio at which the drive derates the frequency reference during an oH alarm.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the PM motor overcurrent detection level as a percentage of the motor rated current value.
Description
Description
Description
Description
YASKAWA SIEPC71061753A GA500 Technical Manual
Default
(Range)
1
(0, 1)
Default
(Range)
1
(0, 1)
Default
(Range)
0.8
(0.1 - 0.9)
Default
(Range)
300.0%
(0.0 - 1000.0%)