L3: Stall Prevention - YASKAWA CIMR-VU BA0001 Technical Manual

No.
L2-07
n L2-08: Frequency Gain at KEB Start (KEB 1 only)
When KEB 1 is activated, the output frequency is reduced in a single step in order to quickly get the motor into a regenerative
state. The amount of this frequency reduction can be calculated using the following formula:
Amount of reduction = Slip frequency prior to KEB x (L2-08/100) x 2
No.
L2-08
n
L2-11: Desired DC Bus Voltage during KEB (KEB 2 only)
Sets the desired voltage in the DC bus during KEB 2 operation.
No.
L2-11
<1> Values are for 200 V class drives and must be doubled for 400 V class drives.
u

L3: Stall Prevention

When the load is too high or acceleration and deceleration times are too short, the motor may be unable to keep up with the
frequency reference, resulting in excessive slip. This "stalling" makes it impossible to decelerate or accelerate. The drive can
prevent the motor from stalling and still reach the desired speed without the user needing to change the acceleration or
deceleration time settings. The Stall Prevention function can be set separately for acceleration, operating at constant speeds,
and deceleration.
n
L3-01: Stall Prevention Selection during Acceleration
Stall Prevention during acceleration is used when the motor loses speed during acceleration due to a relatively large load. It
prevents overcurrent and motor overload (oL1) from occurring.
This parameter sets the Stall Prevention method for acceleration.
No.
L3-01
<1> Setting 2 is not available for PM OLV.
Setting 0: Disabled
No Stall Prevention is provided. If the acceleration time setting is too short, the drive may not be able to accelerate within the
set time and the motor may stall.
Setting 1: Enabled
Enables Stall Prevention during acceleration. The operation depends on the selected control mode.
• V/f or Open Loop Vector Control:
When the output current exceeds 85% of the level set in parameter L3-02, the acceleration rate is reduced. The acceleration
is stopped when the current exceeds L3-02. Acceleration continues when the current falls below L3-02.
The Stall Prevention level is automatically reduced in the field weakening area.
During Acceleration on page
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
Name
KEB Acceleration Time
Name
Minimum Frequency Gain at KEB Start
Name
Desired DC Bus Voltage during KEB
Name
Stall Prevention Selection during Acceleration
223.
5.8 L: Protection Functions
Setting Range
0.0 to 25.5 s
Setting Range
0 to 300%
Setting Range
<1>
150 to 400 V
Setting Range
<1>
0 to 2
Refer to L3-03: Stall Prevention Limit
Default
0.0 s
Default
100%
Default
E1-01 x 1.22
Default
1
5
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