5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual 319
Setting 0: IP00 enclosure
For an IP00 enclosure drive installed with at a minimum of 30 mm space to the next drive or a cabinet wall.
Setting 2: IP20/NEMA 1, UL Type 1 enclosure
For drives compliant with IP20/NEMA 1, UL Type 1 enclosure specifications.
Setting 3: External heatsink Installation
For a standard drive mounted with the heatsink outside the cabinet or enclosure panel.
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L8-38: Carrier Frequency Reduction Selection
Lets the drive reduce the carrier frequency when the output current exceeds a certain level. This temporarily increases the
overload capability (oL2 detection), allowing the drive to 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 Advanced Open Loop Vector for PM motors.
Setting 0: Disabled
No carrier frequency reduction at high current.
Setting 1: Enabled for output frequencies below 6 Hz
The carrier frequency is reduced at speeds below 6 Hz when the current exceeds 100% of the drive rated current. The
drive returns to its normal carrier frequency when the current falls below 88% or the output frequency exceeds 7 Hz.
Setting 2: Enabled for entire frequency range
The carrier frequency is reduced at the following speeds:
• Below 6 Hz when the current exceeds 100% of the drive rated current.
• Above 7 Hz when the current exceeds 112% of the drive rated current.
The drive uses the delay time set in parameter L8-40 and a hysteresis of 12% when switching the carrier frequency back
to the set value.
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L8-40: Carrier Frequency Reduction Off-Delay Time
The following settings are used when the carrier frequency is to be reduced at start:
• Time taken for the reduced carrier frequency to return to the carrier frequency set at C6-02.
• Time taken to return to the set carrier frequency after reducing it by setting L8-38 to 1 or 2.
The carrier frequency reduction function at start is disabled if this value is 0.00 s.
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L8-41: High Current Alarm Selection
Triggers a current alarm (HCA) when the output current rises too much.
Setting 0: Disabled
No alarm is detected.
Setting 1: Enabled
An alarm is triggered when the output current exceeds 150% of the drive rated current. A digital output set for an minor
fault (H2- = 10) will close.
No. Name Setting Range Default
L8-38 Carrier Frequency Reduction Selection 0 to 2
Determined by A1-02,
C6-01 and o2-04
No. Name Setting Range Default
L8-40 Carrier Frequency Reduction Off-Delay Time 0.00 to 2.00 s Determined by A1-02
No. Name Setting Range Default
L8-41 High Current Alarm Selection 0 or 1 0
SIEP_C710636_02B_1_0.book 319 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
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