YASKAWA CIMR-VU BA0001 Technical Manual page 238

5.8 L: Protection Functions
n L8-18: Software Current Limit Selection
The Software Current Limit (CLA) is a drive protection function that prevents output 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.
No.
L8-18
<1> Default setting is determined by drive software version and C6-02 setting. Drive software versions PRG: 1021 and later have a default setting of 0
when the carrier frequency is set for Leakage Current Rejection PWM (C6-02 = B), and 1 when C6-02 is set to any other value.
Setting 0: Disabled
The drive may trip on an oC fault if the load is too heavy or the acceleration is too short.
Setting 1: 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.
n L8-29: Current Unbalance Detection (PM OLV only)
Current unbalance can heat up a PM motor and lead to demagnetization of the magnets from heat. The current imbalance
detection function prevents such motor damage by monitoring output currents and triggering a LF2 fault in case of current
unbalance.
No.
L8-29
Setting 0: Disabled
The drive does not protect the motor.
Setting 1: Enabled
When an output current imbalance is detected, a LF2 fault is triggered, the output is switched off, and the motor coasts to stop.
n L8-35: Installation Method Selection
Selects the type of installation 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.
No.
L8-35
Setting 0: IP20/IP00 Drive
Must be selected if an IP20/IP00 drive is installed with a minimum of 30 mm space to the next drive or a cabinet wall.
Setting 1: Side-by-Side Mounting
Must be selected if drives are Side-by-Side mounted with a minimum space of 2 mm.
Setting 2: NEMA Type 1 Drive
Must be selected if the drive has a NEMA Type 1 enclosure or an IP20/Open-Chassis drive fitted with the NEMA Type 1 Kit
option.
Setting 3: Finless Drive or External Heatsink Installation
Must be selected for finless drives or if a standard drive is mounted with the heatsink outside the cabinet.
n L8-38: Carrier Frequency Reduction Selection
The drive can reduce the carrier frequency when the output current exceeds a certain level. This temporarily increases the
overload capability (oL2 detection) and the drive can run through transient load peaks without tripping.
L8-38 selects the operation of the carrier frequency reduction function.
Note: This function cannot be used in Open Loop Vector for PM motors.
238
Name
Software Current Limit Selection
Name
Current Unbalance Detection (LF2)
Name
Installation Method Selection
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Setting Range
0 or 1
Setting Range
0 or 1
Setting Range
Determined by
0 to 3
Default
<1>
Default
1
Default
o2-04