YASKAWA A1000 Series Technical Manual

5.8 L: Protection Functions
272 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
■ 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: 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.
■
L8-18: 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. For proper drive protection and operation leave the Software
CLA function enabled.
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 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, 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
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.
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 300.0% 300.0%
No. Name Setting Range Default
L8-29 Current Unbalance Detection (LF2) 0 or 1 1

YASKAWA A1000 Series Specifications

General

Series	A1000
Type	AC Drive
Altitude	Up to 1000m without derating
Output Frequency	0-400 Hz
Control Method	V/f Control
Overload Capacity	150% for 60 seconds
Communication Options	Modbus, DeviceNet, Profibus, Ethernet/IP
Ambient Temperature	-10 to 50°C
Storage Temperature	-20 to 60°C
Humidity	5% to 95% (non-condensing)
Enclosure Rating	IP20
Horsepower	0.5 to 1000 HP
Power Range	0.4 - 630 kW (varies by voltage and model)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overheat
Cooling Method	Fan Cooled
Safety	Safe Torque Off (STO)