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/ I40-3-2-type variables constant pressure water supply equipment. The system uses electronic control part of the @ bearing FRN3TP9S - 4 frequency converter. Small size, programmable, experts P! D tuning and many other advanced control performance for the fire service even more of their worries more, and is currently the advanced control system. Figure I, Figure 2. Figure 1 Schematic diagram of fine defense system block diagram of automatic control of electric lumbar 2 I Work (1) When the selection switch to manual operation manual position, the system into manual operation. Three fire pumps are frequency independent state of operation. Three pumps can be run simultaneously. (2) automatic operation when the selector switch in the automatic position, the system goes into automatic operation. When the fire pipe network pressure is lower than when given pressure 1.5MPa, PID controller 40 signals to variable speed governor. Soft Cave moving l # pump, pressure changes according to the network, the frequency change with, played the role of constant pressure on the pipe network. In case of fire, alone l # pump can not meet the requirements of the request. 1 # pump will quickly run to the frequency (5OHz) state, starting with the anti-2 # pump variable frequency controller and change led operation, the frequency changes by changing the motor speed, so as to achieve a constant pressure of the pipe network to meet the water supply requirements. When the two pumps have a failure, 3 # pump will automatically be put into operation. When the system pressure is higher than the given pressure (1.5MPa), the Procellariiformes system will quickly remove a # container pumps (operating frequency), while valves automatically open electrical outlet, only to run through the pump # 2 to a constant pipeline pressure. Three pump cycle operation, the first open first stop, the load uniform. The control cabinet with the fire control center Pina linkage, when the case of fire,[link widoczny dla zalogowanych], the fire center through the linkage, control box will automatically be put into operation and self-sustaining, For parking, take the linkage signal is interrupted. . The control cabinet at any time with periodic manual inspection auto inspection and inspection functions, the electric power instant pressure relief valve so that pressure is below a given control nausea A pressure tube, three pumps will turn out well and put into operation to solve the pump corrosion, dead pump problems and improve reliability. The control cabinet has a water level automatic protection function and alarm sound and light display, when the pool water, it will automatically stop the pump, concurrent sound and light alarm, when the water level returns to normal, the water pump from # 1 - quite a moving object recovery operation. 2 Features (1) energy efficient. Water pressure needs to be set by (1.5MPa), based on changes in water pressure frequency control, constant pressure variable water supply, the pump has high efficiency in running condition, compared with the current water supply system can save typically 30 - 4O. (2) pressure regulator, high precision, continuously adjustable flow regulation law thanks to PID. At the start and stop the pump, the pressure fluctuations small. Regulation of high precision, typically ± 0.01MPa, and can change with the water pump work automatically change the speed and number of Taiwan (3) high degree of automation, simple operation, long life, strong anti-interference performance. Equipped with imported inverter with overcurrent, overvoltage, undervoltage, overload, short circuit,[link widoczny dla zalogowanych], overheating and other self-protection, because of the soft-start motor is no impact on current. To-day setbacks. I Tanzanian National Telecommunications Building electrical maintenance, renovation project profile Bureau of the Ministry of Foreign X-Cheng Wang Tiegang Tanzanian National Telecommunications building is Tanzania Telecommunications Limited (TTcL) of all, the repair, renovation project is the construction of Office Building Group in Tanzania Tanzania A large project to undertake electrical maintenance, renovation project is composed of all its important points. 1 Project Overview Tanzanian National Telecommunications Tower was built in 1970, built by the British contractor, wall structure, has three podium, above the standard level for the l2 layer between the top of the building with water tanks, elevator machine room, satellite antenna front-end equipment room and central air-conditioning system belongs to the frozen room. Podium level in the telecommunications business operating room, the second and three for the communications equipment room, the standard level ten layer, second floor office space for the telecommunications company,[link widoczny dla zalogowanych], @ other layers for business rental space. Long-term use due to the building, is aging and the need for comprehensive maintenance, transformation. 2 electrical maintenance, lighting, power distribution renovation project 2.1 update thousands of lines of the standard at the original lighting distribution main is located in the penthouse of the power distribution room leads to a layer, using cross-section of 35mm plastic wire, the trench, electrical shaft to layers of distribution box, according to the requirements of owners and consulting engineers, to ditch the plastic shaft and removed all the copper wire,[link widoczny dla zalogowanych], shafts replaced by closed-end plug-bus, a trench with 5 × 75mm PVC insulated copper cable replacement, cable lead to the shaft through the trench with the closed end of the beginning of side bus plug box crimping. Closed docking bus are set in each plug hole with air switch, from 41
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