YASKAWA GA700 Technical Manual page 957

Figure 11.134 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 the value set in L3-02 at a
minimum, the drive will start deceleration in as specified by the value set in L3-22 [PM Stall Prevention Decel
Time]. When the output current is less than the value set in L3-02 - 15%, the drive stops deceleration. When the
time set in L3-27 is expired, the drive starts acceleration again.
Figure 11.135 Stall Prevention During Acceleration Function in OLV/PM
2 : Intelligent (Ignore Accel Ramp)
The drive ignores the acceleration time setting and the drive starts to accelerate in the minimum length of time.
The drive automatically adjusts the acceleration rate and the output current will not be more than the value set in
L3-02.
3 : Current Limit Method
This function limits the output current with the value set for L3-02 and automatically adjusts the acceleration rate.
When the load (output current) increases to more than the current limit level during acceleration, the drive
automatically adjusts the acceleration rate.
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
11.9 L: Protection Functions
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