How are S3 and S4 of the "One-in-one-standby soft start control circuit diagram of fire pump" on page 28 of Atlas 0 1D303-3 closed? I hope to elaborate. thank you

1, S3 and S4 in the figure (connected with detachable terminals XT 1:5 and 6, XT 1:7 and 8) are connected with bypass signal output terminals S3 and S4 of soft starter QSS 1 and 2.

2. The closing actions of 2.S3 and S4 are completed inside the soft starter (the start-up process ends, and it is switched to full voltage operation). In order to understand the mechanism of closing action, it is necessary to look at the internal schematic diagram of soft starter.

3. Analyze the working principle of atlas, as long as you know the function of the soft starter in the figure.

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