Learning Protection Features
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).
A gain used to decelerate without over voltage fault trip. It compensates for
the inverter output voltage.
Stall protection and flux braking operate together only during deceleration. Turn on the third and
fourth bits of PRT-50 (Stall Prevention) to achieve the shortest and most stable deceleration
performance without triggering an over voltage 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 be easily damaged.
• Use caution when decelerating while using stall protection since the deceleration time can
take longer than the time set, depending on the load. 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.
• If the input voltage exceeds the nominal voltage, there is a possibility that the deceleration
stall does not work properly.
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