Chapter 12 Descriptions of Parameter SettingsMS300
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When you set Pr.06-02 to 1 to use smart over-voltage stall prevention during deceleration, the
drive maintains the DC bus voltage when decelerating and prevents the drive from OV.
When you enable the over-voltage stall prevention, the drive’s deceleration time is longer than
the setting. If you encounter any problem with the deceleration time, refer to the following guides
for troubleshooting.
1. Increase the deceleration time to a proper value.
2. Install a brake resistor (refer to Section 7-1 Brake Resistors and Brake Units Used in AC
Motor Drives for details) to dissipate the electrical energy that is generated from the motor.
Related parameters:
Pr.01-13, Pr.01-15, Pr.01-17, Pr.01-19 Deceleration Time 1–4
Pr.02-13 Multi-function Output 1 (Relay 1)
Pr.02-16–Pr.02-17 Multi-function Output 2–3 (MO1, MO2)
Pr.06-01 Over-voltage Stall Prevention.
If the motor load is too large or the drive’s acceleration time is too short, the output current of the
drive may be too high during acceleration, and it may cause motor damage or trigger the drive’s
protection functions (OL or OC). Use this parameter to prevent these situations.
During acceleration, the output current of the drive may increase abruptly and exceed the setting
value of Pr.06-03. In this case, the drive stops accelerating and keeps the output frequency
constant, and then continues to accelerate until the output current decreases.
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