Industrial Control Summary:At present, the phenomenon of water pumps rusting and dying due to long-term use of fire-fighting equipment is very common (reaching more than 70% in some areas). Simply relying on manual methods to detect fire pumps has been repeatedly proven to be unable to guarantee the reliable operation of fire pumps.
　　
Fire water supply equipment is a basic component of a fixed fire water supply system. Although this part accounts for a relatively high proportion of the cost of the entire building's fire protection system (usually around 100%), lack of experience and lessons have proven that the success of initial fire suppression mainly depends on the integrity of this part of the equipment. The characteristics of fire water supply equipment are: regular use, long-term use, and once used, it must play a role. At present, the phenomenon of water pump rusting and death caused by long-term use of fire-fighting equipment is very common (up to 70% or even 80% in some areas). Simply relying on manual methods to detect fire pumps has been repeatedly proven to be unable to guarantee the reliable operation of fire pumps.
　　
In response to this phenomenon, the * department has formulated the mandatory document "Performance Requirements and Experimental Methods for Fixed Fire Water Supply Equipment at Home" GA30.2, which clearly requires that fire equipment must have automatic inspection function. The document clearly stipulates that:
　　
1. The equipment should have automatic and manual inspection functions, and its automatic inspection cycle should be able to be set as needed.
　　
2. The fire pump is controlled to start and operate one by one, with each pump running for less than 2 minutes.
　　
3. The equipment should be able to automatically exit the inspection and enter the fire protection operation state when encountering a fire signal during the inspection process.
　　
4. During the inspection, if any faults are found, there should be sound and light alarms. Devices with fault memory function should record the type of fault and the time of occurrence of the fault, with less than 5 pieces of fault information, and their display should be clear and easy to understand.
　　
Next, let's talk about the application of PAS6000 intelligent power transmitter in the fire water supply equipment inspection system:
　　
The PAS6000 intelligent power transmitter has the following characteristics: The PAS6000 intelligent power transmitter is a cost-effective intelligent parameter transmitter that can replace previous series of transmitters such as current, voltage, power, power factor, and power. It can greatly reduce system costs, facilitate on-site wiring, and improve system reliability. It can also be connected to other manufacturers' control modules on the same 485 bus, and is easy to program with computers, making it easy for you to build your own measurement and control system. Adopting electromagnetic isolation and optoelectronic isolation technology, voltage input, current input, and output are all isolated. Its main functions and technical indicators are as follows.
　　
input signal
　　
Three phase AC 50/60Hz voltage and current. Input frequency: 45-75Hz.
　　
Voltage range (phase voltage): 60V, 100V, 250V, 300V, 400V, 500V optional.
　　
Current range: 1A, 2A, 20A, (50A, 100A, 200A, 500A, 1000A require external current sensor), etc. are optional.
　　
Signal processing: 16 bit A/D conversion, 6 channels, synchronous AC sampling at 4KHz rate for each channel, true RMS measurement;
　　
According to the update, the real-time update cycle of PAS6000 intelligent power transmitter can be set (40mS~1000ms, each step is 10mS).
　　
Overload capacity: 1.4 times the range input can be measured correctly; Instantaneous (<10 cycles) current 5 times, voltage 3 times range damaged.
　　
communication output
　　
Output data: three-phase phase voltages Ua, Ub, Uc; Three phase currents Ia, Ib, Ic; Active power P, reactive power Q, power factor PF, active power Pa, Pb, Pc of each phase; Positive and negative active energy, etc
　　
Electric parameter.
　　
Output interface: RS-485 two-wire ± 15KV ESD protection, or RS-232 two-wire ± 2KVESD protection.
　　
Communication speed (Bps): 1200, 2400, 4800, 9600, 19.2K.
　　
Communication protocol: Standard MODBUS-RTU protocol.
　　
In this inspection system, the PAS6000 intelligent power transmitter provides the controller with comprehensive electrical parameters such as current, voltage, power, power factor, etc., thus providing complete information for the controller to make various judgments, such as overvoltage, undervoltage, phase loss protection, motor stalling and other error messages.
　　
During inspection, the fire inspection controller will check and confirm that the main circuit of the fire control cabinet is normal, and then drive each fire pump to run at low speed. At this time, the driving power is very small, about one percent of the rated power of the pump motor, so energy saving is significant. Moreover, due to the low speed, the water supply network will be pressurized.