**Abstract:** The microcomputer-controlled soft starter is designed to address technical challenges associated with the start-up of power frequency systems, particularly in fire water supply applications. This technology significantly improves the reliability and efficiency of fire pump operations by reducing electrical and mechanical stress during motor startup. **Keywords:** soft starter, electric shock, mechanical impact, PLC programmable, mechatronics, power factor With the rapid development of modern firefighting systems in our country, the application of microcomputer-based soft-start technology has become essential in fire water supply systems. It effectively resolves many issues related to the starting of fire pumps using traditional methods such as star-delta or autotransformer starters. **First, control and startup problems in fire pump water supply systems** 1. In a fire water system, ensuring that fire pumps and sprinkler pumps operate normally is critical. Previously, these systems used power frequency (star-delta or autotransformer) startup methods, which had serious technical shortcomings. These methods were unreliable, unstable, and caused significant electrical and mechanical shocks during each start-up and shutdown. As a result, various technical problems emerged. For example, large pumps with high starting currents could cause system crashes, circuit breakers to trip, or even power outages. Additionally, water hammer effects in the piping system could damage valves, check valves, and pump couplings, shortening equipment lifespan and creating hidden safety risks in fire engineering projects. To mitigate these issues, personnel had to be on duty to manually open valves and periodically energize the pumps to prevent rusting. In case of a fire, strict procedures were followed: closing the valve first, then powering up the motor, and gradually opening the valve once the system was stable. This process often took 10 minutes or more, and any delay due to human error or technical failure could lead to missed opportunities in fire suppression, with potentially devastating consequences. 2. Although star-delta or autotransformer starting methods are permitted in fire design codes, their practical implementation in China often reveals technical flaws and unclear responsibilities, leading to fire facilities being "on paper" but not functional. This is especially true in energy-intensive enterprises and institutions, where these issues are more likely to surface. Many fire-fighting systems pass inspections upon completion, but fail during actual operation. This is often due to transformers operating at full capacity, and sudden large motor starts causing excessive current, leading to system failures or power outages. If this continues, the system may lose both manual and automatic fire suppression capabilities, resulting in severe consequences. In summary, the traditional power frequency (star-delta and autotransformer) starting method has several major drawbacks: - Large electrical impact - Significant mechanical stress - Manual start-up makes automatic inspection difficult - Long start-up time delays fire response **Second, characteristics and performance of microcomputer soft starter for fire pumps** Using the DWQ series motor soft starter, large fire pumps can be started directly without closing the valve, eliminating issues like high starting current and system crashes. This technology is computer-controlled, allowing precise regulation of voltage and current through phase angle control. It features a ramp-up voltage and current limit function, enabling smooth and gradual motor start-up and stop, reducing electrical and mechanical shocks. This system supports electromechanical integration, automation, and unmanned operation, ensuring safe and reliable performance. The product passed national type testing on August 15, 1998, and was officially approved for production and sale by the Liaoning Provincial Fire Department on May 5, 1999. The DXGS microcomputer automatic fire control water supply equipment uses the DWQ series motor soft starter and a PLC programmable logic controller as the main control unit. It enables non-contact control, automatic cycle inspection, and flexible control of electric valves. It also records operating hours and conditions, provides sound and light alarms for fire signals and equipment failures, and supports long-distance control, manual/auto timing switches, and other advanced functions. The DWQ series motor soft starter includes protection features such as phase sequence monitoring, phase loss, overcurrent, overvoltage, undervoltage, and overheating protection. When triggered, it automatically cuts off the motor power and alerts users via sound and light signals. Its main circuit operates without sparks, noise, or vibration, offering long life, high reliability, and minimal maintenance. By replacing traditional startup methods, the DWQ series ensures safer and more reliable motor control, eliminating concerns about heavy-load startups. It also protects the mechanical system from damage, extending its service life and improving overall system performance. Furthermore, the DWQ series enhances motor power factor, contributing to energy-efficient operation. **System schematic of GS microcomputer automatic control fire water supply equipment** [Image: GS microcomputer automatic control fire water supply equipment system schematic] **Voltage and current control table of DWQ series motor soft starter** [Image: DWQ series motor soft starter voltage and current control table 1] [Image: DWQ series motor soft starter voltage and current control table 2]

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