YASKAWA L1000V Technical Manual page 147

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L8-18: Software Current Limit Selection
The Software Current Limit (CLA) is a drive protection function theat prevents output transistor failures caused by high
current. Parameter L8-18 enables or disables this function.
Note: This setting should not be changed unless absolutely necessary. For proper drive protection and operation leave the Software
CLA function enabled.
No.
L8-18
Setting 0: Disabled
The drive may trip on an oC fault if the load is too heavy or the acceleration is too short.
Setting 1: Enabled
When the soft CLA current level is reached, the drive reduces output voltage in order to reduce the current. If the current
level drops below the software CLA level, the normal operation will resume.
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L8-19: Frequency Reduction Rate during oH Pre-Alarm
Defines the output frequency reduction factor when an oH Pre-Alarm is triggered and L8-03 is set to 4.
No.
L8-19
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L8-35: Installation Selection
Selects the type of installation for the drive and changes the drive overload (oL2) limits accordingly.
Note: This parameter is not reset when the drive is initialized.
No.
L8-35
Setting 0: IP20 enclosure
For an IP20 enclosure drive installed with at a minimum of 30 mm space to the next drive or a cabinet wall.
Setting 1: Side-by-Side Installation
For a drive installed with less than 30 mm space to the next drive or a cabinet wall.
Setting 2: NEMA Type 1 enclosure
For drives compliant with NEMA Type 1 enclosure specifications.
Setting 3: Finless Installation
For finless drives.
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L8-38: Carrier Frequency Reduction Selection
The drive can reduce the carrier frequency when the output current exceeds a certain level. This temporarily increases the
overload capability (oL2 detection) and the drive can run through transient load peaks without tripping.
L8-38 selects the operation of the carrier frequency reduction function.
Note: Automatically lowering the carrier frequency increases motor noise.
No.
L8-38
Setting 0: Disabled
The carrier frequency is not automatically reduced.
Setting 1: Enabled for Output Frequencies below 6 Hz
The carrier frequency is reduced at speeds below 6 Hz when output current exceeds 100% of drive rated current. The
drive returns to its normal carrier frequency when output current falls below 88% of drive rated current or when the
output frequency exceeds 7 Hz.
YASKAWA EUROPE SIEP
Name
Software Current Limit Selection
Name
Frequency Reduction Rate During oH Pre-Alarm
Name
Installation Selection
Name
Carrier Frequency Reduction Selection
YASKAWA AC Drive L1000V Technical Manual
5.8 L: Protection Functions
Setting Range Default
0 or 1
Setting Range Default
0.1 to 0.9
Setting Range Default
0 to 3 Determined by o2-04
Setting Range Default
0 to 2 Determined by o2-04
1
0.8
5
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