Learning tips for alarm circuits and interlocking circuits
Because the alarm and interlocking system play an important role in production safety, and its operation period is long, it is usually in the running state. It is only possible to inspect, debug and repair the unit when it is shut down or the production is overhauled. Therefore, there are few opportunities for regular contact. How should we learn? 1. You can read the alarm and interlocking system drawings within the scope of your company or this area. Through the drawings to familiarize with the input interface signals of the alarm and interlock system, what equipment is transmitted by the field interface signal, whether the receiving signal is a relay or a PLC. Be familiar with the output of the alarm and interlock system, whether it is through relay or solid state relay or thyristor switch output. Look at the field devices or components for redundancy. 2. Start with the drawing of the direct wiring system. Because the direct wiring system connects the switch and detection components directly to the final actuator, it is simple, intuitive and easy to understand. 3, an alarm circuit is selected, the alarm works in conjunction with the drawing circuit, the operation of the analysis process, as to how the field signal causes the relay contact, and then how to relay warning lights, electric bell, how silencer Wait. For safety reasons, the detection components and actuators of the alarm and interlock system should be in the excited state when the system is normal, and the magneto-loss state when the system is not normal. Therefore, the key to seeing the picture is to find out the position of the relay moving and static contacts in the state of excitation and demagnetization. If necessary, use a pencil to gently mark the contacts on the drawing to facilitate understanding. 4. If you are familiar with an alarm circuit on the drawing, you can go to the scene to see the actual object against the drawing. For example, which device is connected to the alarm input point, which terminals are there, whether it is a flash alarm or an alarm light, or the screen displays the electric bell. , the installation position of the mute button, etc. Looking at a few alarm loops will be rewarded. 5, familiar with the alarm circuit , you can learn the interlock circuit , in fact, when learning the alarm circuit, you have already seen some interlock circuits , because many times the alarm and interlock circuits are connected. Focus on how the output signal is interconnected with the valve or electrical operating circuit. Observe the installation position of the interlock release switch at the site. If it is a single unit interlock system, there are still many learning opportunities, because before the machine starts running, it is usually necessary to do a simulation test (also called air test) to check the alarm and whether the interlock system is normal. 6. For PLC, first observe the wiring of the input terminal familiar with it, and find out which instruments or detection components are coming from the signals of each input terminal; then observe the wiring of the output terminals familiar with it, and find out that the signals of each output terminal are sent. Where to go, which devices are controlled. On this basis, you can first learn the programming manual of this type of PLC. If you have the programming software of this machine, you can start and write a simple program in the interview, and then simulate to see if you have achieved the intended goal, and then make some modifications. Slowly study, gradually improve, can not be anxious, do not know to ask colleagues or peers. Of course, it can be combined with the program data of the PLC application of this enterprise to learn in a targeted manner, and the effect is optimal. 7, maintenance, debugging is the best learning opportunity. When the unit is shut down or the production is overhauled, the alarm and interlock system are usually inspected, debugged and repaired. Therefore, this is the best learning opportunity. If you have the conditions, try to get involved in this work, so that you can understand it more deeply, and combine it with the original knowledge. An electric Gate Valve is a type of valve that uses an Electric Actuator to open and close the gate of the valve. The gate is a flat or wedge-shaped piece that moves perpendicular to the flow of the fluid. When the valve is open, the gate is lifted or pushed aside to allow the fluid to pass through. When the valve is closed, the gate is lowered or pressed against the valve seat to prevent the fluid from flowing. Electric Gate Valve,electric actuated gate valve,electric actuator for gate valve,motorised gate valve Description WUXI KVC-VALVE , https://www.kvgatevalve.com
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