Acceleration and Deceleration Characteristics
6-19
îš‹ Stall Prevention During Deceleration Function
This function automatically lengthens the deceleration time with respect to the DC-bus voltage to avoid over-
voltage tripping.
îš„Related Parameters
îš„Setting the Stall Prevention Selection During Deceleration (L3-04)
There are four different settings selectable for L3-04.
L3-04=0: This setting disables the stall prevention function during deceleration. The motor will be decelerated
using the time set in C1-02 (C1-04). If the load inertia is very high and an OV fault occurs during deceleration
a braking option has to be used or the deceleration time has to be lengthened.
L3-04=1: This setting enables the stall prevention during deceleration. The inverter tries to decelerate within
the set deceleration time. It also observes the DC bus voltage. If the DC bus voltage reaches the stall preven-
tion level the deceleration is stopped and the output frequency is held. When the DC bus voltage falls below
the stall prevention level the deceleration will be continued.
L3-04=2: This setting enables the stall prevention during deceleration. The deceleration time set as C1- is
taken as reference. The function automatically tries to optimize the deceleration time by observing the DC bus
voltage and shortening the deceleration time. The function does not lengthen the deceleration time, i.e. if C1-
 is set too short OV may occur.
îš„Setting Example
An example of stall prevention during deceleration when L3-04 is set to 1 is shown below.
Fig 6.22 Stall Prevention During Deceleration Operation
Parameter
Number
Name
Setting
Range
Factory
Setting
Change
during
Operation
Access
Level
E1-01 Input voltage setting
155 to
255
*1
*1. Value for 200 V class Inverters are shown. For a 400 V class inverter the values have to be doubled.
200
VDC
*1
No Q
L3-04
Stall prevention selection during deceleration func-
tion selection
0 to 2 1 No A
Deceleration time controlled to
prevent overvoltage
Deceleration time
(set value)
Time
Output frequency
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