L2: Undervoltage Detection; L3: Stall Prevention - YASKAWA L1000V Technical Manual

5.8 L: Protection Functions
n
L1-13: Continuous Electrothermal Operation Selection
Determines whether to hold the current value of the electrothermal motor protection (L1-01) when the power supply is
interrupted.
No.
L1-13
Setting 0: Disabled
Setting 1: Enabled
u L2: Undervoltage Detection
n
L2-05: Undervoltage Detection Level (Uv)
Determines the voltage at which a Uv1 fault is triggered. This setting rarely needs to be changed.
No.
L2-05
<1>
<1> Values shown are specific to 200 V class drives; double the values for 400 V class drives.
Note: Install an AC reactor option on the input side of the power supply when setting L2-05 below the default value to prevent damage
to drive circuitry.
u L3: Stall Prevention
When the load is too heavy or acceleration ramps are too short, the motor may be unable to keep up with the speed
reference, resulting in excessive slip. During acceleration, this usually causes an overcurrent fault (oC), drive overload
(oL2), or motor overload (oL1). The drive can prevent the motor from stalling and still reach the desired speed without
the user needing to change the acceleration or deceleration ramp settings. The Stall Prevention function can be set
separately for acceleration and operating at constant speeds.
n
L3-01: Stall Prevention Selection during Acceleration
Stall Prevention during acceleration (L3-01) prevents tripping with overcurrent (oC), motor overload (oL1), or drive
overload (oL2) faults common when accelerating with heavy loads.
L3-01 determines the type of Stall Prevention the drive should used during acceleration.
No.
L3-01
Setting 0: Disabled
No Stall Prevention is provided. If the acceleration time is too short, the drive may not be able to get the motor up to
speed fast enough, causing an overload fault.
Setting 1: Enabled
Enables Stall Prevention during acceleration.
If the output current rises above the Stall Prevention level set in L3-02, then the drive stops accelerating. Acceleration
will not resume until the output current falls 15% below the setting in L3-02.
The Stall Prevention level is automatically reduced in the constant power range.
138
Name
Continuous Electrothermal Operation Selection
Name
Undervoltage Detection Level
Name
Stall Prevention Selection during Acceleration
YASKAWA EUROPE SIEP
Setting Range
0 or 1
Setting Range
150 to 210 Vdc Determined by E1-01
Setting Range
0 to 2
YASKAWA AC Drive L1000V Technical Manual
Default
1
Default
Default
1