Setting 0: Disabled
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: Enabled
The overload protection level (oL2 fault detection level) is automatically reduced at speeds below 6 Hz.
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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. Name Setting Range Default
L8-18 Software Current Limit Selection 0 or 1
<1>
<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.
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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. Name Setting Range Default
L8-29 Current Unbalance Detection (LF2) 0 or 1 1
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. Name Setting Range Default
L8-35 Installation Method Selection 0 to 3
Determined by
o2-04
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.
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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5
Parameter Details
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