|
No.
(Hex.)
|
Name
|
Description
|
Default
(Range)
|
|
L3-01
(048F)
|
Stall Prevention during Accel
|
        
Sets the method of the Stall Prevention During Acceleration.
|
1
(0 - 3)
|
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 the drive detects oC [Overcurrent], oL2 [Drive Overloaded], or oL1 [Motor Overload] when you apply a large load during acceleration or when you set sudden acceleration times related to load inertia.
- 0
- Disable
-
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 does 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. The drive stops deceleration when the output current is less than L3-02 - 15%. The Stall Prevention function level automatically decreases for constant output ranges.
Figure 1. 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 2. 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.
Figure 3. Current Limit Acceleration
