L3: Stall Prevention - YASKAWA FSDrive-MV1000 Parameter Manual

2.8 L: Protection Functions
L2-40: Power Supply Overvoltage Operation Selection
■
Sets the operation when overvoltage is detected at the power supply side.
No.
L2-40 Power Supply Overvoltage Operation Selection
Setting 0: Ramp to Stop (uses the deceleration time set for C1-02)
Setting 1: Coast to stop
Setting 2: Fast Stop (uses the Fast Stop time set for C1-09)
Setting 3: Alarm only
L2-41: Power Supply Overvoltage Detection Level
■
Sets the level at which overvoltage is detected at the power supply side as a percentage of the value set for o2-11
(Reference Voltage for Input Voltage Detection) in 0.1% units.
No.
L2-41 Power Supply Overvoltage Detection Level
L2-42: Power Supply Overvoltage Detection Time
■
Sets the time before overvoltage at the power supply side (iov) is detected, in 0.01 s units. If the state in which the output
voltage exceeds the value set for L2-41 continues for the time set for L2-42 or longer, overvoltage at the power supply
side (iov) is detected.
No.
L2-42 Power Supply Overvoltage Detection Time

◆ 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),
drive overload (oL2), or motor overload (oL1). During deceleration, it can cause excessive regenerative power to flow
back into the DC bus capacitors, eventually causing 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.
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 Stall Prevention during Acceleration Selection
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 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
during Acceleration on page
200
Name
Name
Name
Name
201.
Setting Range
0 to 3
Setting Range
0.0 to 200.0%
Setting Range
0.00 to 2.00 s
Setting Range
0 to 2
YASKAWA ELECTRIC EZZ010930 FSDrive-MV1000 Parameter Guide
Default
3
Default
120.0%
Default
0.05 s
Default
1
L3-03: Stall Prevention Limit