YASKAWA GA800 Programming Manual page 453

Note:
When A1-02 = 5 [Control Method Selection = OLV/PM], the setting range is 0 and 1.
Stall prevention during acceleration prevents the stalling and stopping of motors when oC [Overcurrent], oL2 [Drive
Overloaded], or oL1 [Motor Overload] is detected in cases of significant loads applied during acceleration or sudden
acceleration times regarding load inertia are set.
0 : Disabled
The Stall Prevention function does not operate during acceleration, and acceleration occurs for the set acceleration
time. If the acceleration time is too short, the motor will not fully accelerate during the set time, which causes the
drive to detect oL1 or oL2 and the motor to stop.
1 : Enabled
Enables the Stall Prevention During Acceleration function. Operation is different for different control methods.
• V/f Control, Open Loop Vector Control, or EZ Open Loop Vector Control
When the output current is more than the value set in L3-02 [Stall Prevent Level during Accel], the drive stops
acceleration. Deceleration is stopped once the output current falls below the value set in L3-02 - 15%. The Stall
Prevention function level automatically falls for constant output ranges.
Figure 2.130 Stall Prevention During Acceleration when Using Induction Motors
• Open Loop Vector Control for PM
When the output current is more than the value set in L3-02, the drive stops acceleration. When the time set in L3-
27 [Stall Prevention Detection Time] is expired and the output current is larger than in L3-02, the drive will start
deceleration in as specified by L3-22 [PM Stall Prevention Decel Time]. The drive starts acceleration again once the
output current falls below the value set in L3-02 - 15%. When the time set in L3-27 is expired, the drive starts
acceleration again.
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
2.9 L: Protection Functions
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