YASKAWA iQpump Micro CIMR-PW Series User Manual page 200

5.8 L: Protection Functions
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).
L3-05: Stall Prevention Selection During Run
n
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.
L3-05
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).
L3-06: Stall Prevention Level During Run
n
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.
L3-06
<1> Upper limit and default value are dependent on parameter L8-38, Frequency Reduction Selection
L3-11: Overvoltage Suppression Function Selection
n
Enables or disables the overvoltage suppression function.
No.
L3-11
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.
L3-17: Target DC Bus Voltage for Overvoltage Suppression and Stall Prevention
n
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).
200
Name
Stall Prevention Selection During Run
Name
Stall Prevention Level During Run
Name
ov Suppression Function Selection
Setting Range
Setting Range
30 to 150
Setting Range
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
Default
0 to 2
Default
<1> <1>
Default
0 or 1
1
0