5.8 L: Protection Functions
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
303
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L2-13: Input Power Frequency Fault Detection Gain
Sets the gain used to detect a power supply frequency fault (Fdv).
If an Fdv fault occurs with no momentary power loss, reduce the setting value in 0.1 increments.
■
L2-21: Low Input Voltage Detection Level
Sets the low input voltage detection level.
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L2-27: Power Supply Frequency Fault Detection Width
There is normally no need to change this parameter from the default value. Sets the frequency width used to detect a
power supply frequency fault (Fdv) in Hz.
◆
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. During acceleration, this usually causes an overcurrent fault (oC),
overload (oL2), or motor overload (oL1). During deceleration, it can cause the drive to fault out from overvoltage (oV).
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.
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L3-01: Stall Prevention Selection during Acceleration
Stall Prevention during acceleration (L3-01) prevents tripping with overcurrent (oC), motor overload (oL1), or overload
(oL2) faults common when accelerating with heavy loads.
L3-01 determines the type of Stall Prevention the drive should used during acceleration.
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, thus tripping an overload fault.
Setting 1: Enabled
Enables Stall Prevention during acceleration. Operation varies, depending on the control mode.
• V/f Control, V/f Control with PG, and Open Loop Vector Control:
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.
Refer to L3-03: Stall Prevention
Limit during Acceleration/Deceleration on page 305
No.
Name
Setting Range
Default
L2-13
Input Power Frequency Fault Detection Gain
0.1 to 2.0
1.0
No.
<1> Values are specific to 200 V class drives. Double the value for 400 V class drives.
Name
Setting Range
Default
L2-21
Low Input Voltage Detection Level
100 to 230 V
150 V
No.
Name
Setting Range
Default
L2-27
Power Frequency Fault Detection Width
3.0 to 20.0 Hz
6.0 Hz
No.
Name
Setting Range
Default
L3-01
Stall Prevention Selection during Acceleration
0, 1, 3
1
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