YASKAWA CIMR-VU BA0001 Technical Manual page 225

Setting 0: Disabled
Drive runs at the set frequency reference. A heavy load may cause the motor to stall and trip the drive with an oC or oL fault.
Setting 1: Decelerate Using C1-02
If the current exceeds the Stall Prevention level set in parameter L3-06, the drive decelerates at Decel Time 1 (C1-02). Once
the current level drops below the value of L3-06 minus 2% for 100 ms it accelerates back to the frequency reference at the
active acceleration time.
Setting 2: Decelerate Using C1-04
Same as setting 1 except the drive decelerates at decel time 2 (C1-04).
n L3-06: Stall Prevention Level During Run
Sets the current level for Stall Prevention During Run. Depending on the setting of parameter L3-23 the level is automatically
reduced in the constant power range (speed beyond base speed).
No.
L3-06
<1> The upper limit and default value for this setting are determined by C6-01, Drive Duty Selection, and L8-38, Carrier Frequency Reduction Selection.
n L3-23: Automatic Stall Prevention Level Reduction
This function reduces the Stall Prevention during run level in the constant power range.
No.
Automatic Reduction Function Selection for Stall Prevention during
L3-23
Setting 0: Disabled
The level set in L3-06 is used throughout the entire speed range.
Setting 1: Enabled
The Stall Prevention level during run is reduced in the constant power range. The lower limit will be 40% of L3-06.
n Overvoltage Suppression Function
This function suppresses overvoltage faults by slightly increasing the output frequency when the DC bus voltage rises. It can
be used to drive loads with cyclic regenerative operation, such as punch presses or other applications that involve repetitive
crank movements.
The output frequency is adjusted during ov suppression so that the DC bus voltage does not exceed the level set in parameter
L3-17. In addition to the parameters explained below, ov suppression also uses these settings for frequency adjustment:
• DC bus voltage gain L3-20
• Deceleration rate calculations gain L3-21
• Inertia calculations for motor acceleration time L3-24
• Load inertia ratio L3-25
Note: 1. The motor speed will exceed the frequency reference when overvoltage suppression is triggered. Consequently, overvoltage suppression
is not appropriate in applications that require a perfect match between the frequency reference and the actual motor speed.
2. Disable overvoltage suppression when using a braking resistor.
3. Overvoltage may still occur if there is a sudden increase to a regenerative load.
4. This function is enabled only when operating just below the maximum frequency. Overvoltage suppression does not increase the output
frequency beyond the maximum frequency. If this is required by the application increase the maximum frequency and change the base
frequency setting.
n L3-11: Overvoltage Suppression Function Selection
Enables or disables the overvoltage suppression function.
No.
L3-11
Setting 0: Disabled
The output frequency is not adjusted. A regenerative load may trip the drive with an overvoltage fault. Use this setting if
braking options are installed.
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Name
Stall Prevention Level During Run
Name
Run
Name
ov Suppression Function Selection
5.8 L: Protection Functions
Setting Range
<1>
30 to 150
Setting Range
0 or 1
Setting Range
0 or 1
Default
<1>
Default
0
5
Default
0
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