5.8 L: Protection Functions
Setting 0: Protection disabled at low speed
The overload protection level is not reduced. Frequently operating the drive with high output current at low speed can
lead to premature drive faults.
Setting 1: protection enabled at low speed
The overload protection level (oL2 fault detection level) is automatically reduced at speeds below 6 Hz.
■ L8-27: Overcurrent Detection Gain
Adjusts the overcurrent detection level when running in CLV/PM. A setting o f 100% is equal to the motor rated current.
When the drive rated current is considerably higher than the motor rated current, use this parameter to decrease the
overcurrent level in order to prevent motor demagnetization by too high current.
Overcurrent detection will use whichever value is the lowest: the overcurrent level for the drive, or the motor rated
current multiplied by L8-27.
No.
Name
Setting Range
Default
L8-27
Overcurrent Detection Gain
0.0 to 300.0%
300.0%
■ L8-29: Current Unbalance Detection (LF2)
Enables or disables output current imbalance detection when running in CLV/PM. Current unbalance can heat up a PM
motor and lead to demagnetization o f the magnets. The current imbalance detection function prevents such motor
damage by monitoring output current and triggering the LF2 fault when current unbalance occurs.
No.
Name
Setting Range
Default
L8-29
Current Unbalance Detection (LF2)
0 or 1
1
Setting 0: Disabled
No current unbalance protection is provided to the motor.
Setting 1: Enabled
The LF2 fault is triggered if an output current imbalance is detected. Drive output shuts off and the motor coasts to stop.
■ L8-35: Installation Selection
Selects the type o f installation for the drive and changes the drive overload (oL2) limits accordingly.
Note: This param eter is not reset when the drive is initialized.
No.
Name
Setting Range
Default
L8-35
Installation Selection
0 or 2
Determined by o2-04
Setting 0: IP20 enclosure
For an IP20 enclosure drive installed with at a minimum o f 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.
■ L8-38: Automatic Torque Boost Function
When the output current reaches a certain level the drive automatically reduces the carrier frequency to the level set in
L8-39. Because lowering the carrier frequency increases the overload tolerance, the drive is capable o f creating
considerably more torque. When the output current falls, the carrier frequency switches back to the value set in C6-03.
Note: 1. A utom atically lowering the carrier frequency increases m otor noise.
2. Confirm drive capacity so that the m aximum output current is less than the current limit.
No.
Name
Setting Range
Default
L8-38
Automatic Torque B oost Function
0 or 3
0
Setting 0: Disabled
The carrier frequency is not automatically reduced.
Setting 3: Enabled
The torque capability is improved by reducing the carrier frequency when the output current exceeds a certain value.
YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
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