Learning Protection Features
while operating at
constant speed
acceleration, the output frequency automatically
decelerates when the current level exceeds the
preset stall level while operating at constant
speed. When the load current decelerates
below the preset level, it resumes acceleration.
Stall protection
during
deceleration
The inverter decelerates and keeps the DC link
voltage below a certain level to prevent an over
voltage fault trip during deceleration. As a result,
deceleration times can be longer than the set
time depending on the load.
Flux braking
during
deceleration
When using flux braking, deceleration time may
be reduced because regenerative energy is
expended at the motor.
Stall protection
and flux braking
during
deceleration
Stall protection and flux braking operate
together during deceleration to achieve the
shortest and most stable deceleration
performance.
PRT-51
Stall Freq
1– PRT-58
Additional stall protection levels can be configured for different frequencies, based
on the load type. As shown in the graph below, the stall level can be set above the
base frequency. The lower and upper limits are set using numbers that
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