YASKAWA V1000 Technical Manual page 228

5.8 L: Protection Functions
L8-38 selects the operation of the carrier frequency reduction function.
Note: This function cannot be used in Open Loop Vector for PM motors.
No.
L8-38
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.
L8-40
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.
L8-41
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 dectection 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.
L8-51
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.
L8-54
Setting 0: Disabled
Setting 1: Enabled
228
Name
Carrier Frequency Reduction Selection
Name
Low Carrier Frequency Off Delay Time
Name
High Current Alarm Selection
Name
STo Fault Detection Level
Name
STo Deviation Detection
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
Setting Range
Determined by
0 to 2
Setting Range
0.00 or 2.00 s
Setting Range
0 or 1
Setting Range
0.0 to 150. %
Setting Range
0 or 1
Default
o2-04
Default
0.50 s
Default
0
Default
0.0%
Default
1