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No.
Name
Setting Range
Default
L8-38
Carrier Frequency Reduction Selection
0 to 2
Determined by
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 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.
n
L8-40: Carrier Frequency Reduction Off Delay Time
Sets the delay time which is used to switch back to the normal carrier frequency. The carrier frequency reduction function is
disabled if this value is 0 s.
No.
Name
Setting Range
Default
L8-40
Low Carrier Frequency Off Delay Time
0.00 or 2.00 s
0.50 s
n
L8-41: High Current Alarm Selection
The drive can be set to trigger a high current alarm (HCA) when the output current rises too high.
No.
Name
Setting Range
Default
L8-41
High Current Alarm Selection
0 or 1
0
Setting 0: Disabled
No alarm is output.
Setting 1: Enabled
An alarm is triggered when the output current exceeds 150% of the drive rated current. A digital output indicating an alarm
(H2-01/02/03 = 10) can be programmed.
n
L8-51: STo Fault Detection Level
Note:
Parameter available in drive software versions PRG: 1018 and later.
Sets the STo detection level as a percentage of the motor rated current.
Increase this value for faster detection of pull-out during acceleration. The drive calculates this value automatically when
L8-51 is set to 0.0%. There is normally no need to change this parameter from the default value.
No.
Name
Setting Range
Default
L8-51
STo Fault Detection Level
0.0 to 150. %
0.0%
n
L8-54: STo Deviation Detection
Note:
Parameter available in drive software versions PRG: 1018 and later.
Enables or disables the STo Deviation fault detection.
There is normally no need to change this parameter from the default value.
No.
Name
Setting Range
Default
L8-54
STo Deviation Detection
0 or 1
1
Setting 0: Disabled
Setting 1: Enabled
5.8 L: Protection Functions
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
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Parameter Details