YASKAWA Inverter Spécifications télécharger pdf (Page 110)

Stall Prevention Level

During Acceleration

L3-02

-15%

Output current

Output frequency

Time

Controls the output frequency

to prevent the motor from stalling

Figure 5.35 Stall Prevention During Acceleration for Induction Motors

L3-02: Stall Prevention Level During Acceleration

Sets the output current level at which the Stall Prevention during acceleration is activated.

No. Name Setting Range Default

L3-02 Stall Prevention Level during Acceleration

0 to 150%

<1>

<1> The upper limit and default value is determined by the duty rating and the carrier frequency derating selection (C6-01 and L8-38 respectively).

If stalling occurs with L3-02 set to its default value when using a motor that is relatively small compared to the drive, try

lowering L3-02.

L3-04: Stall Prevention During Deceleration Selection

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. Name Setting Range Default

L3-04 Stall Prevention Selection During Deceleration Selection 0, 1, 4 1

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 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 Stall Prevention Level during Deceleration

200 V Class Vdc = 380 V

400 V Class

E1-01 ≥ 400 V Vdc = 760 V

E1-01 < 400 V Vdc = 660 V

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. If this is not appropriate for the application consider using

a braking option.

Figure 5.36 illustrates the function of Stall Prevention during deceleration.

5.7 L: Protection Functions

110

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