I. Overview
The original industrial pump is voltage direct full voltage start, the upper motor only fuse, there is no motor required for a variety of protection (such as over-voltage protection, under-voltage protection, over-current protection, three-phase unbalance protection, etc.) In the event of the above faults, there may be a serious accident that the motor will be burnt down. 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 selecting automatic operation, it is also necessary to select a single pump or two pumps according to the operation of 1 unit or 2 units. 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 control of 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 interlocking function
When any one of the pumps fails, the system sends an alarm signal to notify maintenance personnel to troubleshoot the problem. At the same time, after a certain delay, the system automatically switches to another pump operation.
3. The system has remote \ local control function
4. The system has a variety of operating status indication
Control cabinet equipped with digital ammeter display motor current, very intuitive;
Pump operation, stop, fault indication;
Control power indicator
System automatically run, stop instructions;
System fault indication, and audible alarm.
Third, Schneider soft start working characteristics
Schneider Electric is a global company and one of the largest suppliers of automation equipment in the world. As the first international automation company to enter the Chinese market, Schneider Electric has more than 20 years of partnership in China and has established itself in China The strength of the network's largest service system, from start to finish for your system from design to run to provide a reliable guarantee.
1, Model: ATS46C14N soft-start selection ATS46
2, Schneider soft starter has the following characteristics:
Altistart46 can control start and stop of three-phase asynchronous squirrel-cage motor. able to provide:
l Control of motor operating characteristics, especially during start-up and stop;
l Motor and starter thermal overload protection;
l mechanical protection of transmission machinery, remove torque surge and reduce the impact of current;
l Acceleration torque control in the whole zone 1
l adjust the motor torque according to the application requirements;
l reduce motor wear and tear
l with LCD debugging window, easy to set parameters and read the query alarm information, such as current value;
3, soft starter starter protection:
n short circuit protection: 13ICL-20ms;
n thermal protection after bypass function;
n immunity
n capture the rotation load;
n short-term power-off protection <200ms;
n overload
n Continuous load current trip limit: alarm 50% ~ 300% In, minimum 10S;
n continuous load in the stall;
5 × In (nominal current setting) -200ms
Maximum setting 5 × ICL (starter current rating)
n underload (deep well pump) rated torque of 20% -100%
n Preheat: 10% ICL to avoid condensation;
n Torque limit 200% of Tn (adjustable): useful only during acceleration;
n Mechanical overload: analog output pre-alarm;
n Delay start time: 1S ~ 999S;