5.8 L: Protection Functions
256 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
■ L3-01: Stall Prevention Selection during Acceleration
Stall Prevention during acceleration (L3-01) prevents tripping with overcurrent (oC), motor overload (oL1), or drive
overload (oL2) faults common when accelerating with heavy loads.
L3-01 determines the type of Stall Prevention the drive should used during acceleration.
Setting 0: Disabled
No Stall Prevention is provided. If the acceleration time is too short, the drive may not be able to get the motor up to
speed fast enough, thus tripping an overload fault.
Setting 1: Enabled
Enables Stall Prevention during acceleration. Operation varies, depending on the control mode.
• V/f Control, V/f Control with PG, and Open Loop Vector Control:
If the output current rises above the Stall Prevention level set in L3-02, then the drive stops accelerating. Acceleration
will not resume until the output current falls 15% below the setting in L3-02.
The Stall Prevention level is automatically reduced in the constant power range. Refer to L3-03: Stall Prevention
Limit during Acceleration on page 257.
Figure 5. 96
Figure 5.96 Stall Prevention During Acceleration for Induction Motors
• Open Loop Vector Control for PM:
If the output current remains above the Stall Prevention level set in L3-02 for the time set in L3-27, then the drive will
begin to decelerate using the deceleration time set in L3-22. (Refer to L3-22: Deceleration Time at Stall Prevention
during Acceleration on page 257.) Acceleration will not resume until the output current falls 15% below the setting in
L3-02.
No.
<1> Setting 2 is not available for PM OLV.
Name Setting Range Default
L3-01 Stall Prevention Selection during Acceleration 0 to 2 <1> 1
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