Setting 2: Fast Stop
The drive stops the motor using the Fast stop time set in parameter C1-09.
Setting 3: Alarm Only
The operation is continued and a FAn alarm is displayed on the digital operator.
Setting 4: Operation with Reduced Speed
The operation is continued, but the speed is reduced to the level set in parameter L8-19.
Note: “FAn” is detected as an error when Settings 0 or 2 are selected; it is detected as an alarm when Settings 3 or 4 are selected.
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L8-38: Carrier Frequency Reduction Selection
Selects the operation of the carrier frequency reduction function. Reduces 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.
Note: This function cannot be used in AOLV/PM.
No. Name Setting Range Default
L8-38 Carrier Frequency Reduction Selection 0 to 2
Determined by
A1-02, C6-01 and
o2-04
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 the 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.
No. Name Setting Range Default
L8-40 Carrier Frequency Reduction Off-Delay Time 0.00 to 2.00 s
Determined by
A1-02
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L8-41: High Current Alarm Selection
Triggers a high current alarm (HCA) when the output current exceeds 150% of the drive rated current.
No. Name Setting Range Default
L8-41 High Current Alarm Selection 0, 1 0
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 alarm
(H2-oo = 10) will close.
1.8 L: Protection Functions
156
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
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