YASKAWA GA700 Series Technical Manual page 888

12.9 L: Protection Functions
Figure 12.133 Stall Prevention During Acceleration when Using Induction Motors
• Open Loop Vector Control for PM
When the output current is more than L3-02, the drive stops acceleration. When the time set in L3-27 [Stall
Prevention Detection Time] is expired and the output current = L3-02, the drive will start deceleration as
specified by the value set in L3-22 [PM Stall Prevention Decel Time]. The drive starts acceleration again when
the output current is less than L3-02 - 15%. When the time set in L3-27 is expired, the drive starts acceleration
again.
Figure 12.134 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 to make sure that the output current is not more than L3-02.
3 : Current Limit Acceleration
This function uses the L3-02 value to limit the output current and automatically adjust 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.
888 YASKAWA SIEPC71061705H GA700 Series Technical Manual