4-202
When the DC-bus voltage exceeds the stall prevention level deceleration will stop and the inverter will wait for the
DC-bus voltage to fall below the stall prevention level before continuing deceleration. Stall prevention level can be
set by 08-02, see Table 4.4.13.
Table 4.4.13 Stall prevention level
Inverter model
08-02 default value
200V class
385VDC
400V class
770VDC
575V class
950VDC
690V class
1140VDC
Note:
When using external braking (braking resistor or braking module) disable stall prevention during
deceleration (08-00 to xx1xb).
t
Output
frequency
Deceleration time is extended to
prevent overvoltage.
Deceleration
time
Figure 4.4.69 Stall prevention selection in deceleration
Stall prevention selection during run (08-00=x0xxb)
Stall prevention during run can only be used in V/F or V/F + PG and SLV2control mode.
This function prevents the motor from stalling by automatically reducing the output frequency during run.
If the inverter output current rises above the level set in parameter 08-03 for the time specified in parameter 08-22,
the inverter output frequency is automatically decreased following deceleration time 1 (00-15) or deceleration time
2 (00-17).
When the inverter output current falls below the level set in parameter (08-03) minus 2%, normal operation
continues and the output frequency increases to the frequency reference using the acceleration time 1 or
acceleration time 2. Refer to the following figure 4.4.70.
Note
: The stall prevention level during run can be set by using multi-function analog input AI2 (04-05=7).
