131
1 : Enabled
When the main circuit voltage exceeds the tall Prevention level during acceleration, the
deceleration pauses and hold the frequency. When the main circuit voltage falls below the Stall
Prevention level, the drive continues to decelerate using the set deceleration time. Stall
Prevention might be triggered repeatedly to prevent an overvoltage fault.
Stall Prevention might lengthen the total deceleration time until a completely stop. Therefore
install a braking option for applications such as conveyors.
The Stall Prevention function is illustrated below.
Output frequency
Time
Set deceleration time
Deceleration characteristics
when Stall Prevention is
triggered during deceleration
Figure 6.81 Stall Prevention during Deceleration Operation
P3-04 Stall Prevention Level during Deceleration
Sets the voltage level to activate the Stall Prevention function during deceleration.
Stall Prevention Level during Deceleration
When the regenerative power boosts the main circuit DC voltage higher than the value set to
this parameter during deceleration, the drive performs Stall Prevention during deceleration to
prevent an oV (Overvoltage) fault. Lower this value if the load is too heavy which causes a rapid
regenerative power increase.
<1> This value is for a 200 V AC drive. Double this value for a 400 V AC drive.
P3-05 Stall Prevention during Run
Stall Prevention during run prevents an oL1 (Motor Overload) fault when the motor is running
at constant speed.
Stall Prevention during Run
Note: