LS ELECTRIC SV-iS7 Series, User Manual

Page: 346 / 491

Using Protection Features
329
Code Description
Setting Function
0
0001 Stall protection
during
acceleration If the inverter output current exceeds the preset stall
level (PRT-52, 54, 56, 58) during acceleration, the
motor stops accelerating and starts decelerating. If
current level stays above the stall level, the motor
decelerates to the start frequency (DRV-19). If the
current level causes deceleration below the preset
level while operating the stall protection function,
the motor resumes acceleration.
1
0001 Stall prevention
during
acceleration
(Mode2) If the inverter's output current exceeds the preset
stall level (PRT-52, 54...) during acceleration, the
inverter adjusts the output frequency to prevent
stalling. The inverter performs a PI control on the
current level to adjust the output frequency to be
above the stall level. While the stall prevention
feature is activated, the inverter starts accelerating
again when the the current drops below the the set
level.
0
0010 Stall protection
while operating at
constant speed Similar to stall protection function during
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.
1
0010 Stall prevention
while operating at
a constant speed
(Mode2) Similar to the stall protection function during
acceleration (Mode 2), if the inverter output current
exceeds the preset stall level while operating at a
constant speed, the inverter adjusts the output
frequency according to the load current. When the
load current drops below the preset level, the
inverter resumes acceleration.
1 or 0
0100 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.
1 or 0
1000 Flux braking
during
deceleration When using flux braking, deceleration time may be
reduced because regenerative energy is expended
at the motor.
1 or 0
1100 Stall protection
and flux braking
during Stall protection and flux braking operate together
during deceleration to achieve the shortest and most
stable deceleration performance.