Fire pump is the heart of the fire water system. In the fire water system, the installation of fire reserve pump can increase the safety of the entire system, help to improve the reliability of the entire fire water system. Fire water supply system should be equipped with spare fire pump. The main standby switch fire pump standby fire pump to achieve an important means of investment, but also fire water supply system, reliable, safe operation of an important part. Let us work together to understand the main fire pump standby switching method.
　　
1 fire pump main standby switching method
　　
From the fire pump start signal acquisition and control point of view, the design of the main standby pump fire switch There are two main ways. The key is to control the choice of signal source, which can be divided into current signal control method and pressure signal control method. Usually fire pump main and backup pumps are required to be mutually alternative way to design.
　　
Current signal control method is now the fire control design of fire pump standby switch the common method. It is through the pump motor current signal feedback to determine whether the fire pump is working. When the motor is short circuit (power off), the current is too large, the power automatically switches to another pump unit motor, stop the first fire pump, start another fire pump.
　　
Of course, the principle of electric fire pump control can be arbitrarily designated a fire pump as the main pump or spare pump. Current signal control method in the current domestic use of the earliest, most of the pressure signal control methods in foreign sprinkler system began to use, the pressure signal control method for automatic fire control system provides a reliable way.
2 main standby switching method comparison
　　
2.1 Analysis of the causes of fire pump failure Fire pump failure The final result is that the fire pump can not be normal water supply. Fire pump failure caused by the main reason can be divided into two categories, one is the motor failure, the other is the pump failure.
　　
2.2 fire pump standby switching method of analysis
　　
The current signal control method, which has the advantage of timely reflection of motor failure. The fault of the motor is also the main fault of the pump unit. However, this method does not explain whether the fire pump is actually out of water.
　　
2.3 Comparison of two control methods
　　
Current signal control methods and pressure signal control methods are the main standby switch fire pump way. Fire pump control requirements are the same, and the two methods of signal acquisition is different, the ultimate control of the effect is also different.
　　
2.4 pressure signal control method should pay attention to the problem
　　
(1) The electrical node pressure gauge should be located in the fire pump outlet pipe, should not be located in front of the fire pump valve.
　　
(2) in the signal control to determine the circuit design, to be switched to set a certain time delay.
　　
(3) Switching of pressure signal control method The main pump or spare pump of the fire pump can be arbitrarily designated, and can also be switched periodically.
　　
(4) fire pump control in addition to automatic control, but also should have the function of local control. Fire pump work signals need to be sent to the fire control center for monitoring, control and building self-control records.
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