Issues related to soft starters
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May I ask everyone, how is a soft starter connected to a circuit? Soft starters are generally used for high-power motors. How do you connect the terminals of 6 motors? Is there a circuit diagram for this?
This post was last edited by zhaohh3211 on 2010-7-16 at 13:14. The soft starter is connected in parallel with the bypass; that is, during startup, the soft starter is activated first, and once the parameters set by the user are reached, the bypass is activated, thereby achieving the actual operating current at line frequency. Generally, soft starting is achieved by limiting current and voltage; in most cases, the bypass is activated when these values reach around 60%-80%. When stopping the machine, a soft stop should be used depending on the load conditions. For example, in the case of water pumps, a soft stop is necessary to prevent water hammer effects; this involves first activating the soft start function, then shutting off the bypass, followed by reducing the current and voltage before finally stopping the machine. If a soft stop isn’t available, it’s sufficient to simply turn off the contactor.
The configuration with 6 terminals uses the soft starter internal connection method, and the current is √3/3 times the original value!