5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual 237
■ L8-27: Overcurrent Detection Gain
Adjusts the overcurrent detection level when running in OLV/PM. 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.
■
L8-29: Current Unbalance Detection (LF2)
Enables or disables output current imbalance detection when running in OLV/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.
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.
■
L8-32: Main Contactor and Cooling Fan Power Supply Failure Selection
Determines drive operation when a FAn fault occurs.
Setting 0: Ramp to stop
The drive stops the motor using the deceleration time1 set in parameter C1-02.
Setting 1: Coast to stop
The drive output is switched off and the motor coasts to stop.
Setting 2: Fast Stop
The drive stops the motor using the Fast stop time set in parameter C1-09.
Setting 3: Alarm only
The operation is continued and a FAn alarm is displayed on the digital operator.
Setting 4: Operation with reduced speed
The operation is continued but the speed is reduced to the level set in parameter L8-19.
Note: FAn is detected as an error when setting 0 to 2 is selected. It is detected as an alarm when setting 3 or 4 is selected.
■ L8-35: Installation Method Selection
Selects the type of installation for the drive and changes the drive overload (oL2) limits accordingly.
Note: 1. This parameter is not reset when the drive is initialized.
2. The value is preset to the appropriate value when the drive is shipped. Change the value only when using Side-by-Side installation or
when mounting a standard drive with the heatsink outside the cabinet.
Setting 0: IP00 enclosure
For an IP00 enclosure drive installed with at a minimum of 30 mm space to the next drive or a cabinet wall.
No. Name Setting Range Default
L8-27 Overcurrent Detection Gain 0.0 to 300.0% 300.0%
No. Name Setting Range Default
L8-29 Current Unbalance Detection (LF2) 0 or 1 1
No. Name Setting Range Default
L8-32 Main Contactor and Cooling Fan Power Supply Failure Selection 0 to 4 1
No. Name Setting Range Default
L8-35 Installation Method Selection 0 to 3 Determined by o2-04
SIEP_C710616_35.book 237 ページ ２０１５年１１月３０日 月曜日 午後２時２分
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