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Abstract: Articles by engineering debugging instance, analysis shows the linkage system power settings and the line voltage drop on the linkage system of the fire, and put forward solutions to problems. Keywords: Fire Fighting and power supply voltage drop wire resistance contact resistance electromagnetic release As China's social and economic development, large scale construction and high building more and more, in the building, the fire alarm and fire facilities linkage system is essential. Construction commissioning found that when building large scale, high floor, line length, set the power is heavy fire, the fire could not rational linkage configuration and control of power line voltage drop of the line, easily lead to terminal voltage can not start the fire fighting equipment. But these early works, but also failed to rise to the full attention of the staff until late in the project pilot phase transfer _ only discovered the seriousness, the next time you find ways to take various remedial measures, not only time-consuming and labor, and more losses than gains . Automatic fire alarm and fire in the linkage system design, motion control for fire equipment, the power to set reasonable, reliability is essential. When the fire is determined, the fire area and adjacent facilities in the region smoke, fire doors, fire shutter doors received action command should be able to move quickly and accurately. Movement power voltage should be DC24V. Power configuration is to install a cabinet in the fire linkage DC power equipment (including transformers, rectifiers, batteries, etc.), power supply DC24V sent through the control of the fire control room end of the regional fire service equipment. Configuration of power need to pay attention in engineering practice to consider two aspects: one is the power supply capacity should meet the relevant requirements of fire fighting equipment at the same time action; the other end of the voltage to meet the fire safety equipment and reliable action, that is to avoid power lines the adverse effects of voltage drop. 1. Power configuration of the system of Fire linkage system requirements for the operation of all fire fighting equipment must be stable and reliable. In engineering practice, fire linkage system the quality of power supply equipment for its system to run more and more significant impact, not only from the system power supply voltage, frequency and current are the basic elements of fire fighting equipment to meet the demand for electricity , also from the fire fighting equipment is matched with. In the specific design, the related fire-fighting equipment should include all the pressure building supply outlet stairwell, fire layer and the upper and lower adjacent layers of the exhaust valve (I), electric fire doors, fire shutter doors. To a banking center architecture, for example, fire doors on each floor there are four, exhaust ports 2, 18-storey building has two smoke stairwell pressure inlet port 36. By Fire Code, the fire-fighting equipment at the same time the total current of action: I total = 3 × (2I1 +4 I2) +36 xI3 The formula: I1?? Exhaust valve action current I2?? Fireproof door action current I3?? Send air valve action current Under: I1 = 0.8A I2 = 0.4A I3 = 0.8A It: I total = 3 × (2 × 0.8 +40 × 0.4) +36 × 0.8 = 38.7A Linkage tests during the building, the fire center start command is given, blower, smoke machine normal operation, sending air valve, exhaust valve is not moving. After measurement, the power output of less than 24V, reason, this power supply rated output current of 36A, when the load current is greater than the rated current, the power protection circuit operations to reduce the output voltage, leading to send air valve, exhaust valve voltage is too low not start. 2. Line voltage drop on the system of Line voltage drop problem mainly caused by wire resistance and contact resistance. We are high quality suppliers, our products such as LED Tube Lights T8 , LED Tube Lights T5 for oversee buyer. To know more, please visits LED Tube Lights T8.
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