Function Application
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Start with DC braking is applicable to scenarios where the motor may rotate upon
start of the AC drive.
If the DC braking time is set to 0, the AC drive starts running at the startup frequency.
If the DC braking start time is not 0, the AC drive performs DC braking first and then
starts to run at the startup frequency. This mode is applicable to most low‑inertia
loads and scenarios where the motor may rotate upon start of the AC drive.
Figure 3‑29 Timing diagram of start with DC braking
Start after DC braking is suitable for driving loads such as elevators and lifting
machines. Start after reaching startup frequency hold time is suitable for driving
equipment that requires a starting torque, for example, cement mixers. The following
figure shows the frequency curve during startup.
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