Yaskawa AC Drive P1000 Bypass Technical Manual User Manual

Page 129

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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.

Name

Setting Range

Default

L3-03

Stall Prevention Limit during Acceleration

0 to 100%

50%

Stall Prevention level during Acceleration

Output frequency

L3-03

E1-06

Base frequency

L3-02

Figure 5.32 Stall Prevention Level and Limit During Acceleration

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L3-04: Stall Prevention Selection during Deceleration

Stall Prevention during deceleration controls the deceleration based on the DC bus voltage and prevents an overvoltage fault

caused by high inertia or rapid deceleration.

No.

Name

Setting Range

Default

L3-04

Stall Prevention Selection During Deceleration

0 to 5

<1>

1

<1> Setting 3 is not available in models 4A0930 or 4A1200.

Setting 0: Disabled

The drive decelerates according to the set deceleration time. With high inertia loads or rapid deceleration, an overvoltage fault

may occur. If an overvoltage fault occurs, use dynamic braking options or switch to another L3-04 selection.

Setting 1: General-purpose Stall Prevention

The drive tries to decelerate within the set deceleration time. The drive pauses deceleration when the DC bus voltage exceeds

the Stall Prevention level and then continues deceleration when 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

208 Vac Bypass Drives

377 Vdc

480 Vac Bypass Drives

754 Vdc

Note:

1. Do not use this setting in combination with a Dynamic Braking Resistor or other dynamic 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 dynamic braking option.

Figure 5.33

illustrates the function of Stall Prevention during deceleration.

Output Frequency

Deceleration characteristics
when Stall Prevention was
triggered during deceleration

Time

specified deceleration time

Figure 5.33 Stall Prevention During Deceleration

5.8 L: Protection Functions

YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual

129

5

Programming

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