Study on the situation caused by the problem of the fan system of the actuator

We have tested the experienced operating personnel. For the generator hot air system failure, it is judged from the operating personnel that the generator has a problem, and it is found that the fault is returned to the operating generator to reduce the load. The limit value has greatly exceeded 20s, and the possibility of unit shutdown is very great. Therefore, it is possible to automatically determine the fault of the generator hot air system and automatically reduce the generator load according to the fault category, which can effectively reduce the accident rate and, if Other types of faults are more effective in ensuring the normal operation of the generator.

The protection system design uses a low-end computer component that is replaced (no need for display, keyboard, printer, etc.) and an input/output interface board to form a simple system. The simple software can solve this problem better, and also solve other problems. Some related problems, the system is not expensive, can be put in or out at any time, the system is divided into three parts, the first part is fault signal detection; the second part is load monitoring, the third part is load adjustment and action record.

Fault signal detection The hot air system alarm signal is inconsistent with the signal level that the computer can handle. The voltage level of the alarm signal sent by the differential pressure meter must be isolated from DC 220V and converted into DC 5V voltage level. There is no need to add additional input devices, as long as the alarm signal is introduced into the parallel print port status interface of the computer (the computer can accept 25 states). The D0D1 data output line is used as the chip select decoding signal, so that only one piece of data is connected to the four-wire buffer T1126 or T4126 of the three machines, and the rest is in a high impedance state.

Monitoring of load monitoring load Select analog input channel, timing start program, A/D conversion and reading program are as follows: MOVAL, 01HMOVDX, 31CH; O1H send 31CH port, start 8253 channel start timing OUTDX, AL,, MOVDX, 310HMOVAL, nH; select the analog input channel, 3 sets are 0H02HOUTDX, AL,, A: MOVDX, 312H; read A/D conversion result high 4-bit data INAL, DX; read status ANDAL, ALJSMOVINA; STS is not equal to 0 Turn (A/D conversion is not finished) EX, DX; save data MOVDX, 313H; read A/D conversion result low 8-bit data AL, DX; load adjustment and action record load adjustment only involves load reduction operation, as long as simulation The RTU operation of the PDS computer control system with the unit can achieve the goal. That is, according to the comparison with the size of the setting data, an uninterrupted pulse signal (when the positive error is large) and a single pulse train of the 200 ms period (when the given number is approached) are output. The two voltage outputs of the MS-1251A can be decoded to control four adjustments.

Button control, PDS output signal, RTU output signal pulse waveform. Adjusting the pulse waveform comparison diagram 215 The program flow program simplifies the flow.