First, an overview of the original industrial pump voltage direct total voltage start, the upper motor only fuse, there is no need for a variety of motor protection (such as over-voltage protection, under-voltage protection, overcurrent protection, three-phase unbalance protection ), In the event of the above failure, there may be a serious accident was burned motor. The transformation plans to use the French Schneider Electric ATS46 soft starter to increase the motor protection. And use Siemens S7-200 programmable control relay instead of the original control circuit. Second, the system function 1. The system has a hand \ automatic switching function When the choice of automatic operation, but also according to the operation of a unit or 2 units to choose a single pump or 2 pumps to run. Single unit operation, select a single pump operation, the system automatically controls a pump running water level signal, so that the water to maintain the predetermined level. When the water level is below the low water level automatically soft-start the pump, when the water level above the high water level automatically stop the pump. The system automatically down pump according to the running time, 2 pumps to achieve automatic cycle operation. When two units are running at the same time, the water supply capacity is big. When the dual-stage pump is running, the system automatically controls one pump to keep running. The other pump starts and stops automatically by the low water level signal and high water level signal to keep the water level at a predetermined level. When selecting manual operation, keep the original control function. That is controlled by the control room selection switch to control the pump for the self-cast state, standby state or the state of the solution, by the control panel or on-site power box panel to control the soft start and stop the pump. At the same time 2 pumps remain interlocked. This condition is suitable when manual switching operation or single repair is required. 2. Two pumps with interlock function When any one of the pump fails, the system sends an alarm signal to notify maintenance personnel to troubleshoot, at the same time after a certain delay, the system automatically switches to another pump operation. 3. The system has a remote \ local control function 4. The system has a variety of operating status indication The control cabinet is equipped with digital ammeter display motor current, very intuitive; pump operation, stop, fault indication; control power instructions; system automatically run, stop instructions; System fault indication, and audible alarm. Schneider soft start working characteristics Schneider Electric is a global enterprise, is the world's largest supplier of automation equipment, while the first to enter the Chinese market as an international automation company in China for more than 20 years Partnership, in China established a strong, the largest network of service system, from beginning to end for your system from design to run to provide a reliable guarantee. 1, Model: ATS46C14N in ATS46 for soft start. Schneider soft starter has the following features: Altistart46 can control start and stop of three-phase asynchronous squirrel-cage motor. Provides: l control of the motor operating characteristics, especially during start-up and stop; l thermal overload protection of the motor and starter; l mechanical protection of the transmission machinery, eliminating torque surges and reducing inrush current; 1 zone to control the acceleration torque; l according to the application requirements to adjust the motor torque; l reduce motor loss l with LCD debugging window to facilitate setting parameters and read the query alarm information, such as current value; 3, the soft starter starter protection : N Short circuit protection: 13ICL-20ms; n Thermal protection after bypassing; n Immunity; n Capturing rotational load; n Short-term power-off protection n Overload; n Continuous load current trip limit: 50% 300% In, minimum 10S; n Stall in continuous load; 5 × In (nominal current setting) -200ms Maximum setting 5 × ICL (starter rated current) n 20% -100 of underload (deep well pump) % n Preheat: 10% ICL to avoid condensation; n Torque limit is 200% of Tn (adjustable): Useful only during acceleration; n Mechanical overload: Analog output pre-alarm; n Delay start time: 1S ~ 999S;
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