YASKAWA FSDrive-MV1000 Parameter Manual page 202

2.8 L: Protection Functions
L3-04: Stall Prevention Selection during Deceleration
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Stall Prevention during deceleration can control the deceleration based on the DC bus voltage and prevent an overvoltage
fault caused by high inertia or rapid deceleration.
No.
L3-04 Stall Prevention Selection during Deceleration
Setting 0: Disabled
When this setting is used, the drive decelerates according to the set deceleration time. With high inertia loads or rapid
deceleration, an overvoltage (ov) fault may occur. In this case, use dynamic braking options or switch to another L3-04
selection.
Setting 1: Enabled
With this setting the drive tries to decelerate within the set deceleration time. When the DC bus voltage exceeds the Stall
Prevention level, the drive interrupts deceleration and maintains the frequency at that time. Deceleration continues as
soon as the DC bus voltage drops below that level. Repeating these operations makes it possible to decelerate the motor
to a stop without causing a DC Bus Overvoltage (ov) fault even when a deceleration time is set too short beyond the drive
capacity. The DC bus voltage level for Stall Prevention depends on the input voltage setting E1-01.
Note: This method may lengthen the total deceleration time compared to the set value. If this is not appropriate for the application
consider using a braking option.
Figure 2.74 illustrates the function of Stall Prevention during deceleration.
Figure 2.74
L3-05: Stall Prevention Selection during Run
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Stall Prevention during run can prevent a motor from stalling by automatically reducing the speed when a transient
overload occurs while the motor is running at constant speed.
This parameter determines how Stall Prevention works during run.
This parameter determines how Stall Prevention works during run.
No.
L3-05 Stall Prevention Selection during Run
Note: 1. This function is available in V/f Control.
2. When output frequency is 6 Hz or less, Stall Prevention during run is disabled regardless of the setting in L3-05 and L3-06.
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, then the drive will decelerate at decel time 1 (C1-
02). Once the current level drops below the value of L3-06 minus 2% for 100 ms, the drive 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).
202
Name
Output Frequency
specified deceleration time
Figure 2.74 Stall Prevention During Deceleration
Name
Setting Range
0 or 1
Deceleration characteristics
when Stall Prevention was
triggered during deceleration
Setting Range
0 to 2
YASKAWA ELECTRIC EZZ010930 FSDrive-MV1000 Parameter Guide
Default
1
Time
Default
1