Acceleration and Deceleration Characteristics
6
-
21
Preventing Overvoltage During Deceleration (Stall Prevention During Decelera-
tion Function)
This function automatically lengthens the deceleration time with respect to the DC-bus voltage to avoid over-
voltage tripping.
Related Parameters
Setting Example
An example of stall prevention during deceleration when L3-04 is set to 1 as shown below
.
Fig 6.21 Stall Prevention During Deceleration Operation
Setting Precautions
•
The stall prevention level during deceleration differs depending on the inverter rated voltage and the input
voltage. Refer to the following table for details.
•
When using the braking option (Braking Resistor Units and Braking Units), be sure to set parameter L3-04
to 0.
Param-
eter-
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Acess
Level
LCD Display
L3-04
Stall prevention selec-
tion during deceleration
function selection
0: Disabled (Motor decelerates according to setting. When the
deceleration time is short, there is a risk of DC bus overvol-
tage (0V) occurring.)
1: Enabled (Prevents deceleration when DC bus voltage rea-
ches the overvoltage level. Deceleration restarts after
voltage has been restored.)
2: Optimum adjustment (Minimizes deceleration judging from
DC bus voltage. The deceleration time setting is ignored.)
If using the dynamic brake option (Braking Resistor Units and
Braking Units), be sure to set parameter L3-04 to 0.
0 to 2
1
No
A
StallP Decel Sel
Inverter Rated/Input Voltage
Stall Prevention Level during Deceleration (V)
200 V class
380
400 V class
E1-01
≥
400 V
760
E1-01 < 400 V
660
Deceleration time controlled to
prevent overvoltage
Deceleration time
(set value)
Time
Output frequency
