Learning Protection Features
set above the base frequency. The lower and upper limits are set using
numbers that correspond in ascending order. For example, the range for Stall
Frequency 2 (Stall Freq 2) becomes the lower limit for Stall Frequency 1
(Stall Freq 1) and the upper limit for Stall Frequency 3 (Stall Freq 3).
Stall protection and flux braking operate together only during deceleration. Turn on the third and
fourth bits of Pr.50 (Stall Prevention) to achieve the shortest and most stable deceleration
performance without triggering an overvoltage fault trip for loads with high inertia and short
deceleration times. Do not use this function when frequent deceleration of the load is required,
as the motor can overheat and may be damaged easily.
When you operating Brake resistor, the motor may vibrate under the Flux braking operation. In
this case, please turn off the Flux braking(Pr.50).
• Use caution when decelerating while using stall protection as depending on the load, the
deceleration time can take longer than the time set. Acceleration stops when stall protection
operates during acceleration. This may make the actual acceleration time longer than the
preset acceleration time.
• When the motor is operating, Stall Level 1 applies and determines the operation of stall
protection.
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