YASKAWA T1000V Technical Manual page 192

5.8 L: Protection Functions
L3-03: Stall Prevention Limit during Acceleration
■
The Stall Prevention level is automatically reduced when the motor is operated in the constant power range. L3-03 sets
the lower limit for this reduction as a percentage of the drive rated current.
No.
L3-03
Figure 5.70
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.
No.
L3-22 Deceleration Time at Stall Prevention during Acceleration
■ L3-04: Stall Prevention Selection during Deceleration
Stall Prevention during deceleration can control the deceleration based on the DC bus voltage and prevent an overvoltage
fault caused by high inertia or rapid deceleration.
Selects the Stall Prevention method during deceleration.
No.
L3-04
<1> Settings 3 and 4 are not available in Open Loop Vector Control for PM motors.
Setting 0: Disabled
When this setting is used, the drive decelerates according to the set deceleration time. With high inertia loads or rapid
deceleration, an overvoltage (ov) fault may occur. In this case use braking options or switch to another L3-04 selection.
Note: Use this setting or set L3-04 to 3 whenever a Dynamic Braking Resistor or another braking option is used.
Setting 1: General Purpose Stall Prevention
With this setting the drive tries to decelerate in the set deceleration time. When the DC bus voltage exceeds the Stall
Prevention level, the drive pauses deceleration. Deceleration continues as soon as the DC bus voltage drops below that
level. Stall Prevention may be triggered repeatedly to avoid an overvoltage fault. The DC bus voltage level for Stall
Prevention depends on the input voltage setting E1-01.
Drive Input Voltage
400 V Class
Note: 1. This setting should not be used in combination with a Dynamic Braking Resistor or other braking options. If Stall Prevention during
deceleration is enabled, it will be triggered before the braking resistor option can operate.
2. This method may lengthen the total deceleration time compared to the set value.
192
Name
Stall Prevention Limit during Acceleration
Stall Prevention level during Acceleration
Figure 5.70 Stall Prevention Level and Limit During Acceleration
Name
Name
Stall Prevention Selection during Deceleration
200 V Class
E1-01 ≥ 400 V
E1-01 < 400 V
L3-02
L3-03
Output frequency
E1-06
Base frequency
Stall Prevention Level during Deceleration
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Setting Range
0 to 100%
Setting Range
0 to 6000.0 s
Setting Range
0 to 4
<1>
Vdc = 380 V
Vdc = 760 V
Vdc = 660 V
Default
50%
Default
0.0 s
Default
1