The Kay membrane has no issues with backflow or slag discharge
Thread Content
This post was last edited by sunjl1981 on 2013-1-6 at 20:14. We have been using our Kay membranes for almost 4 years now, and they have worked well all this time. In recent days, several units stopped functioning due to either no backwashing or no slag discharge; the problem was resolved by adjusting the liquid level switch. A few days later, the same issue arose again, and the instruments failed to detect any problems. What do you think might be causing this? This post was last edited by limingshuguang on 2009-3-5 15:17 ] # ， ， &
Check whether the level float is open-circuited, and also see if there is a problem with the solenoid valve!
First, it is necessary to determine whether the problem lies with the PLC, the flexible valve, or a blocked pipe. After the filtration is complete, first check whether the PLC shows that it has entered the backwash mode. If the PLC enters reverse flow yet the actual liquid level does not drop, it means the valve has not opened or the reverse flow pipe is blocked. The valve is not opening (it is not possible to release the air from within the valve chamber), which could be due to a problem with the solenoid valve or with the quick-open valve of the flexible valve ； There’s no need to talk about blocked pipes. As for the level gauge mentioned by the original poster, I would say that during the backwashing and slag discharge processes, the level gauge simply acts as a stop signal – it triggers when the liquid level drops to that of the float – ignoring the originally set time. When the liquid is introduced, timing begins once the liquid level reaches the set level. As the original poster said, just use a level switch. My understanding is that the filtering timer might not have started; when saltwater passes through the float, the float isn’t sensitive enough to trigger the filtering timer. Although the saltwater exits through the tank, the PLC still thinks that liquid is being fed in, which results in an infinite feeding time. Without filtration, there will be no automatic backflow; and without backflow, there is naturally no automatic slag discharge. It is very important to check the PLC status display. I wasn’t at the scene, so that’s all I can say; I’m not sure if it’s helpful or not. This post was last edited by pzhhuagong on 2009-3-5 17:06]
The most important thing is to check the level switch and wiring issues; actually, what was said upstairs is already very clear. If the pipeline is blocked, or if there are problems with the flexible valve, quick-opening valve, or solenoid valve, then ERR1 will occur. Last edited by limingshuguang on 2009-3-5 15:19.]
Check the level switch; it’s necessary to replace it to resolve the issue
Based on the actual situation in our company, the main issue is related to the solenoid valves； The recoil or slag discharge pipes are so large that they generally don’t get clogged.
The level switch is immersed in saltwater, which can easily lead to the formation of salt crystals inside the switch, affecting the instrument and causing abnormal operation of the filter. Replacing the level switch will restore normal operation