ST600s | Change start and stop ramp

The start and stop ramps can be set separately on an ST600. A higher start ramp reduces the inrush current and can protect the inverter from unintentional shutdown. A higher stop ramp gives the inverter more time to brake the load and can thus protect against overvoltages in the DC link. For small and light loads, on the other hand, the ramp can be reduced to allow for quick ramping up and braking.

P00.11 = 20s (start ramp from 0 to P00.03 in 20s)

P00.12 = 20s (stop ramp from P00.03 to 0 in 20s)

The start and stop ramps are normally selected in relation to the maximum frequency. This then gives a fixed speed at which the frequency changes (Hz/s), which is then used for each braking or acceleration process. If the frequency is lower than the maximum frequency, the acceleration/deceleration process is therefore shortened by the ratio of the actual and maximum frequency.

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