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 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.
• 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 Input/output 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.
Input/output open-
phase protection
Input voltage range
during open-phase
*Displayed as on the Keypad.
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