YASKAWA U1000 Series

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5.8 L: Protection Functions

YASKAWA ELECTRIC

SIEP C710636 02B YASKAWA U1000 Technical Manual 307

Parameter Details

■ 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). A setting of 100% is equal to the drive

rated current.

The Stall Prevention level can be adjusted using an analog input. Refer to Multi-Function Analog Input Terminal

Settings on page 289 for details.

■

L3-22: Deceleration Time at Stall Prevention during Acceleration

Sets the brief deceleration time used when stalling occurs while accelerating a PM motor. When set to 0, this function is

disabled and the drive will decelerate at the selected deceleration time when stalling occurs.

The function is effective only in Open Loop Vector Control for PM motors and if parameter L3-01 is set to 1.

■

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.

■

L3-27: Stall Prevention Detection Time

Sets a delay time from when the Stall Prevention level is reached and the actual Stall Prevention function is activated.

■

L3-36/L3-41: Vibration Suppression Gain during Acceleration/Deceleration (with Current

Limit)

There is normally no need to change these parameters from their default values. These parameters are valid when

acceleration stall prevention (with current limit) is enabled (L3-01 = 3), or when current-limited deceleration is selected

for stall prevention during deceleration (L3-04 = 6). Increase the setting values if oscillation occurs in the output current

during acceleration/deceleration.

■

L3-39/L3-44: Current-limited Integral Time Constant during Acceleration/Deceleration

There is normally no need to change this parameter from the default value. This parameter is valid if current limiting is

selected for Stall Prevention during Acceleration/Deceleration (L3-01 = 3, L3-04 = 6). Set the time constant for

acceleration/deceleration rate adjustment for current-limited acceleration/deceleration.

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>