Yaskawa AC Drive P1000 Bypass Technical Manual User Manual
Page 130
Setting 2: Intelligent Stall Prevention
The drive adjusts the deceleration rate so the DC bus voltage is kept at the level set to parameter L3-17. This produces the
shortest possible deceleration time while protecting the motor from stalling. The selected deceleration time is disregarded and
the achievable deceleration time cannot be smaller than 1/10 of the set deceleration time.
This function uses the following parameters for adjusting the deceleration rate:
• DC bus voltage gain (L3-20)
• Deceleration rate calculations gain (L3-21)
• Inertia calculations for motor acceleration time (L3-24)
• Load inertia ratio (L3-25)
Note:
The deceleration time is not constant. Do not use Intelligent Stall Prevention in applications where stopping accuracy is a concern. Use
dynamic braking options instead.
Setting 3: StallP + Resistor
Setting 4: High Flux Brake
Setting 5: High Flux Brake 2
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L3-06: Stall Prevention Level during Run
Sets the current level to trigger 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).
The Stall Prevention level can be adjusted using an analog input.
No.
Name
Setting Range
Default
L3-06
Stall Prevention Level During Run
30 to 120%
<1>
120%
<1> The upper limit is determined by parameter L8-38, Carrier Frequency Derating Selection.
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L3-11: Overvoltage Suppression Function Selection
Enables or disables the overvoltage suppression function.
No.
Name
Setting Range
Default
L3-11
Overvoltage Suppression Function Selection
0, 1
0
Setting 0: Disabled
The regenerative torque limit and the output frequency are not adjusted. A regenerative load may trip the drive with an
overvoltage fault. Use this setting if dynamic braking options are installed.
Setting 1: Enabled
When the DC bus voltage rises due to regenerative load, an overvoltage fault is prevented by decreasing the regenerative
torque limit and increasing the output frequency.
5.8 L: Protection Functions
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YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual