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5.8 L: Protection Functions
318
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
■
L8-19: Frequency Reduction Rate during Overheat Pre-Alarm
Specifies how much the output frequency is reduced when L8-03 is set to 4 and an oH alarm is present. Set as a factor of
the maximum output frequency.
■
L8-27: Overcurrent Detection Gain
Adjusts the overcurrent detection level when running in OLV/PM, AOLV/PM, or CLV/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.
Note:
The drive detects the lowest overcurrent from the overcurrent level of the drive, the setting value of this parameter, and the
overcurrent level determined from the motor rated current.
■
L8-29: Current Unbalance Detection (LF2)
Enables or disables output current unbalance detection when running in OLV/PM, AOLV/PM, or 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.
Setting 0: Disabled
Motor protection with LF2 is disabled.
Setting 2: Enabled
An LF2 fault is triggered when an output current imbalance is detected. Drive output shuts off and the motor coasts to
stop.
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L8-32 Cooling Fan Failure Selection
Determines drive operation when a FAn fault occurs.
Setting 0: Ramp to stop
The drive stops the motor using the deceleration time 1 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.
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L8-35: Installation Method Selection
Selects the type of installation for the drive and changes the overload (oL2) limits accordingly. Refer to
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 mounting a standard drive with
the heatsink outside the cabinet.
No.
Name
Setting Range
Default
L8-19
Frequency Reduction Rate during Overheat Pre-Alarm
0.1 to 0.9
0.8
No.
Name
Setting Range
Default
L8-27
Overcurrent Detection Gain
0.0 to 400.0%
300.0%
No.
Name
Setting Range
Default
L8-29
Current Unbalance Detection (LF2)
0, 2
2
No.
Name
Setting Range
Default
L8-32
Cooling Fan Failure Selection
0 to 2
1
No.
Name
Setting Range
Default
L8-35
Installation Method Selection
0, 2, 3
Determined by o2-04
SIEP_C710636_02B_1_0.book 318 ページ 2015年11月25日 水曜日 午後4時56分