5.8 L: Protection Functions
194 YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
■ L3-06: Stall Prevention Level during Run
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).
■
L3-23: Automatic Reduction Selection for Stall Prevention during Run
This function reduces the Stall Prevention during run level in the constant power range.
Setting 0: Disabled
The level set in L3-06 is used throughout the entire speed range.
Setting 1: Enabled
The Stall Prevention level during run is reduced in the constant power range. The lower limit will be 40% of L3-06.
■
Overvoltage Suppression Function
This function suppresses overvoltage faults by slightly increasing the output frequency when the DC bus voltage rises. It
can be used to drive loads with cyclic regenerative operation, such as punch presses or other applications that involve
repetitive crank movements.
The output frequency is adjusted during ov suppression so that the DC bus voltage does not exceed the level set in
parameter L3-17.
Note: 1. The motor speed will exceed the frequency reference when overvoltage suppression is triggered. Consequently, overvoltage
suppression is not appropriate in applications that require a perfect match between the frequency reference and the actual motor
speed.
2. Disable overvoltage suppression when using a braking resistor.
3. Overvoltage may still occur if there is a sudden increase to a regenerative load.
4. This function is enabled only when operating just below the maximum frequency. Overvoltage suppression does not increase the
output frequency beyond the maximum frequency. If this is required by the application increase the maximum frequency and change
the base frequency setting.
■ L3-10: Stall Prevention Level during Deceleration
Sets the level of Stall Prevention during deceleration as a percentage of the overvoltage trip level. If the DC bus voltage
exceeds the level set in L3-10 while the drive is decelerating, the drive will stop.
Note: 1. Default setting is determined by the Input Voltage set to E1-01.
2. This parameter is valid only if L3-04 ≠ 2.
■ L3-11: Overvoltage Suppression Function Selection
Enables or disables the overvoltage suppression function.
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.
No.
<1> The upper limit and default for this setting is determined by C6-01 and L8-38.
Name Setting Range Default
L3-06 Stall Prevention Level during Run 30 to 150 <1> <1>
No. Name Setting Range Default
L3-23
Automatic Reduction Function Selection for Stall Prevention
during Run
0 or 1 0
No. Name Setting Range Default
L3-10 Stall Prevention Level during Deceleration 80 to 95% 92%
No. Name Setting Range Default
L3-11 Overvoltage Suppression Function Selection 0 or 1 0
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