L3: Stall Prevention - YASKAWA HV600 Technical Reference

5.8 L: Protection Functions
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L2-05: Undervoltage Detection Lvl (Uv1)
No.
Name
(Hex.)
L2-05 Undervoltage Detection Lvl
(Uv1)
(0489)
NOTICE: Damage to Equipment. When you set this parameter to a value lower than the default, you must install an AC reactor on
the input side of the power supply. If you do not install an AC reactor, it will cause damage to the drive circuitry.
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L3: Stall Prevention

L3 parameters set the Stall Prevention function and overvoltage suppression function.
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Stall Prevention
If the load is too heavy or the acceleration and deceleration times are too short, the motor can slip too much because it
cannot work at the same rate as the frequency reference. If the motor stalls during acceleration, current increases as
the slip increases to cause an oC [Overcurrent], oL2 [Drive Overload], or oL1 [Motor Overload] and the drive will
stop. If the motor stalls during deceleration, too much regenerative power will flow back into the DC bus capacitors
and cause the drive to fault out from ov [Overvoltage] and stop the drive.
The stall prevention function will let the motor get to the set speed without stalling and it is not necessary for you to
change the acceleration or deceleration time settings. You can set a separate stall prevention functions for
acceleration, operating at constant speeds, and deceleration.
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Overvoltage Suppression Function
This function decreases the regenerative torque limit and increases the output frequency when the DC bus voltage
increases to prevent ov. This function can drive loads with cyclic regenerative operation, for example punch presses
or other applications with repeated crank movements. When you use this function, set L3-11 = 1 [Overvoltage
Suppression Select = Enabled].
The drive adjusts the regenerative torque limit and the output frequency during overvoltage suppression to make sure
that the DC bus voltage is not more than the level set in L3-17 [DC Bus Regulation Level].
Set these parameters as necessary when you use the overvoltage suppression function:
• L3-20 [DC Bus Voltage Adjustment Gain]
• L3-21 [OVSuppression Accel/Decel P Gain]
• L3-24 [Motor Accel Time @ Rated Torque]
• L3-25 [Load Inertia Ratio]
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)
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
322
Sets the voltage at which the drive triggers a Uv1 [DC Bus Undervoltage] fault. Usually it is not
necessary to change this setting.
Sets the method of Stall Prevention During Acceleration.
Description
Description
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
Default
(Range)
Determined by o2-04 and
E1-01
(208/240 V: 150 - 220 V,
480 V: 300 - 440 V)
Default
(Range)
1
(0 - 2)