Learning Protection Features
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.
6.2 Inverter and Sequence Protection
6.2.1 Open-phase Protection
Open-phase protection is used to prevent overcurrent levels induced at the inverter inputs due to an
open-phase within the input power supply. Open-phase output protection is also available. An open-
phase at the connection between the motor and the inverter output may cause the motor to stall, due
to a lack of torque.
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