ST300 | Adjusting Acceleration and Deceleration Ramps

The acceleration and deceleration ramps on the ST300 can be set independently. A longer acceleration time reduces the inrush current and can protect the inverter from unintended shutdowns. A longer deceleration ramp gives the inverter more time to brake the load, helping to prevent overvoltage in the intermediate circuit. For small and light loads, the ramp time can be shortened to enable fast acceleration and braking. If no active braking is required when a stop command is given, the deceleration ramp can be skipped by setting P01.08 = 1; it will then only be active when the frequency setpoint is decreased.

P00.11 = 20s (acceleration ramp from 0 to P00.03 in 20s)
P00.12 = 20s (deceleration ramp from P00.03 to 0 in 20s)

The acceleration and deceleration ramps are normally based on the maximum frequency. This results in a fixed rate of frequency change (Hz/s), which is used for every acceleration or deceleration process. If the actual frequency is lower than the maximum frequency, the acceleration/deceleration time is shortened proportionally.

Tags: