Setting 4: Overexcitation Deceleration
Enables overexcitation deceleration. Overexcitation Deceleration (increasing the motor flux) shortens the deceleration time
compared to deceleration with no Stall Prevention (L3-04 = 0). Repetitive or long overexcitation deceleration can result in
motor overheat. In such situations, either shorten the deceleration time setting or use a braking resistor option.
Use parameters n3-13 and n3-23 for fine-tuning this function.
Note: Because the allowable flux level for overexcitation varies based on the flux saturation characteristics of the motor, set the proper
overexcitation level by adjusting the excitation gain in parameter n3-13. Motor characteristics and inertia of the machine influence the
deceleration time during overexcitation deceleration.
Setting 7: Overexcitation Deceleration 3
Provides faster deceleration than normal Overexcitation Deceleration (L3-04 = 4) by increasing the amount of overexcitation
current applied to the motor.
Note: When operation permits, use normal Overexcitation Deceleration (L3-04 = 4).
n
L3-05: Stall Prevention Selection During Run
Stall Prevention During Run can prevent a motor from stalling by automatically reducing the speed when a transient overload
occurs while the motor is running at constant speed.
This parameter selects the Stall Prevention During Run method.
No. Name Setting Range Default
L3-05 Stall Prevention Selection During Run 0 to 2 1
Note: When output frequency is 6 Hz or less, Stall Prevention During Run is disabled regardless of the setting in L3-05/06.
Setting 0: Disabled
Drive runs at the set frequency reference. A heavy load may cause the motor to stall and trip the drive with an oC or oL fault.
Setting 1: Decelerate Using C1-02
If the current exceeds the Stall Prevention level set in parameter L3-06, the drive decelerates at Decel Time 1 (C1-02). Once
the current level drops below the value of L3-06 minus 2% for 100 ms it accelerates back to the frequency reference at the
active acceleration time.
Setting 2: Decelerate Using C1-04
Same as setting 1 except the drive decelerates at decel time 2 (C1-04).
n
L3-06: Stall Prevention Level During Run
Sets the current level for Stall Prevention During Run. Depending on the setting of parameter L3-23 the level is automatically
reduced in the constant power range (speed beyond base speed).
No. Name Setting Range Default
L3-06 Stall Prevention Level During Run
30 to 150
<1> <1>
<1> Upper limit and default value are dependent on parameter L8-38, Frequency Reduction Selection
n
L3-11: Overvoltage Suppression Function Selection
Enables or disables the overvoltage suppression function.
No. Name Setting Range Default
L3-11 ov Suppression Function Selection 0 or 1 0
Setting 0: Disabled
The output frequency is not adjusted. A regenerative load may trip the drive with an overvoltage fault. Use this setting if
braking options are installed.
Setting 1: Enabled
When the DC bus voltage rises due to regenerative load, an overvoltage fault is prevented by increasing the output frequency.
n
L3-17: Target DC Bus Voltage for Overvoltage Suppression and Stall Prevention
Sets the target DC bus voltage target level used by the overvoltage suppression function (L3-11 = 1) and Intelligent Stall
Prevention during deceleration (L3-04 = 2).
5.8 L: Protection Functions
200
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
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