YASKAWA HV600 Manual page 361

Note:
• When overvoltage suppression is triggered, the motor speed is more than the frequency reference. Do not use overvoltage suppression for
applications where the frequency reference and the motor speed must align.
• The overvoltage suppression function is enabled only when you operate immediately below the maximum frequency. Overvoltage
suppression does not increase the output frequency to more than the maximum frequency. Make sure that the motor and machine
specifications are correct for the application, then increase the maximum frequency.
• If there is a sudden increase to a regenerative load, ov can occur.
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L3-01: Stall Prevention during Accel
No.
Name
(Hex.)
L3-01 Stall Prevention during
Accel
(048F)
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 there is a significant load applied during
acceleration or when there are sudden acceleration times with respect to load inertia.
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 or EZ Open Loop Vector Control
The drive stops acceleration if the output current is more than L3-02 [Stall Prevent Level during Accel]. If the
output current is less than L3-02 - 15%, the drive stops deceleration. The Stall Prevention function level
automatically decreases for constant output ranges.
L3-02:
Figure 2.88 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 when
YASKAWA TOEPYAIHV6002A HV600 Drive Programming
V/f OLV/PM EZOLV OLV/PM
Sets the method of Stall Prevention During Acceleration.
Description
2.9 L: Protection Functions
Default
(Range)
1
(0 - 2)
2
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