2.8 L: Protection Functions
YASKAWA ELECTRIC
TOEP C710687 03B FSDrive-MV1000 Parameter Guide
207
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L3-02: Stall Prevention Level during Acceleration
Sets the output current level at which the Stall Prevention during acceleration is activated.
• Stalling may occur when the motor is rated at a smaller capacity than the drive and the Stall Prevention default settings
are used. Set L3-02 as appropriate if stalling occurs.
• When operating the motor in the constant power range, also set parameter L3-03.
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L3-03: Stall Prevention Limit during Acceleration
The Stall Prevention level is automatically reduced when the motor is operated in the constant power range.
L3-03 sets the lower limit for this reduction as a percentage of the drive rated current.
Figure 2.74
Figure 2.74 Stall Prevention Level and Limit During Acceleration
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L3-04: Stall Prevention Selection during Deceleration
Stall Prevention during deceleration can control the deceleration based on the DC bus voltage and prevent an overvoltage
fault (OV) caused by high inertia or rapid 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, 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.
No.
Name
Setting Range
Default
L3-02
Stall Prevention Level during Acceleration
0 to 150%
120%
No.
Name
Setting Range
Default
L3-03
Stall Prevention Limit during Acceleration
0 to 100%
50%
No.
Name
Setting Range
Default
L3-04
Stall Prevention Selection during Deceleration
0, 1
1
Stall Prevention level during Acceleration
Output frequency
L3-03
E1-06
Base frequency
L3-02
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