YASKAWA L1000A Technical Manual page 238

5.8 L: Protection Functions
L8-15: oL2 (Drive Overload) Characteristics Selection at Low Speeds
■
Selects whether the drive overload capability (oL fault detection level) is reduced at low speeds in order to prevent
premature output transistor failures.
Note: Contact Yaskawa for consultation first before disabling this setting.
No.
L8-15
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 to prevent motor damage. A setting of 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.
L8-27
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 of 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.
L8-29
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 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: IP00 enclosure
For an IP00 enclosure drive installed with at a minimum of 30 mm (1.18 in.) space to the next drive or a cabinet wall.
Setting 2: IP00 enclosure with top protective cover
For an IP00 enclosure drive with top protective cover. The digital operator shows "IP20/NEMA 1, UL Type 1".
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Parameter Name
oL2 Characteristics Selection at Low Speed
Parameter Name
Overcurrent Detection Gain
Parameter Name
Current Unbalance Detection (LF2)
Parameter Name
Installation Selection
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Setting Range
0 or 1
Setting Range
0.0 to 300.0%
Setting Range
0 or 1
Setting Range
0 or 2 Determined by o2-04
Default
1
Default
300.0%
Default
1
Default