5.8 L: Protection Functions
298 YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
L8-11: Heatsink Cooling Fan Off-Delay Time
Sets the cooling fan switch off-delay time if parameter L8-10 is set to 0.
L8-12: Ambient Temperature Setting
If the temperature where the drive is mounted is above the specified values, the drive rated current must be reduced for
optimal performance life. By setting the ambient temperature to parameter L8-12 and adjusting the installation method
setting in L8-35, the drive rating automatically adapts to safe values. Refer to Temperature Derating on page 447 for
detail.
L8-15: oL2 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.
Setting 0: oL2 (Drive Overload) characteristics 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: oL2 (Drive Overload) characteristics enabled at low speed
The overload protection level (oL2 fault detection level) is automatically reduced at speeds below 6 Hz.
L8-18: Software Current Limit Selection
The Software Current Limit (CLA) is a drive protection function that prevents main circuit transistor failures caused by
high current. Parameter L8-18 enables or disables this function.
Note: This setting should not be changed unless absolutely necessary.
Setting 0: Software CLA disabled (gain = 0)
The drive may trip on an oC fault if the load is too heavy or the acceleration is too short.
Setting 1: Software CLA enabled
When the soft CLA current level is reached, the drive reduces the output voltage in order to reduce the current. If the
current level drops below the Software CLA level, then normal operation will continue.
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 val
ue is the lowest: the overcurrent level for the drive, or the motor rated
current multiplied by L8-27.
No. Name Setting Range Default
L8-11 Heatsink Cooling Fan Off-Delay Time 0 to 300 s 60 s
No. Name Setting Range Default
L8-12 Ambient Temperature Setting -10 to 50 °C 40 °C
No. Name Setting Range Default
L8-15 oL2 Characteristics Selection at Low Speed 0 or 1 1
No. Name Setting Range Default
L8-18 Software Current Limit Selection 0 or 1 0
No. Name Setting Range Default
L8-27 Overcurrent Detection Gain 0.0 to 400.0% 300.0%
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