YASKAWA L1000A - Page 228

5.8 L: Protection Functions
228 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A 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 uses 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, causing an overload fault.
Setting 1: Enabled
Enables Stall Prevention during acceleration.
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.
Figure 5. 37
Figure 5.37 Stall Prevention During Acceleration for Induction Motors
Setting 2: Intelligent Stall Prevention
The drive disregards the selected acceleration time and attempts to accelerate in the minimum time. The acceleration rate
is adjusted so the current does not exceed the value set to parameter L3-02.
■
L3-02: Stall Prevention Level during Acceleration
Sets the output current level at which the Stall Prevention during acceleration is activated.
• Lower L3-02 if stalling occurs when using a motor that is relatively small compared to the drive.
• Also set parameter L3-03 when operating the motor in the constant power range.
No. Parameter Name Setting Range Default
L3-01 Stall Prevention Selection during Acceleration 0 to 2 1
No.
<1> The upper limit and default value are determined by the carrier frequency reduction (L8-38).
Parameter Name Setting Range Default
L3-02 Stall Prevention Level during Acceleration 0 to 150% <1> <1>
Stall Prevention Level
During Acceleration
L3-02
L3-02
-15%
Output current
Output speed
Time
Time
Controls the output speed
to prevent the motor from stalling
common_TMonly
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