Wiring method of weighing instrument
With the development of technology, weighing instrument has become an indispensable equipment in process management, from the measurement of large and medium tanks, silos, etc., which could not be weighed before, and the measurement of crane scales, car scales, etc. Control, to the automatic batching system for mixing and distributing a variety of raw materials, the automatic identification in the production process and the control of the powder feed amount, etc., all use the weighing instrument. At this stage, the weighing instrument is basically applied to all The weighing industry. Let me introduce to everyone the wiring method of the weighing instrument in detail. The wiring method of the weighing instrument: 1. The general weighing instrument is composed of six cables. When the four-wire system software is connected, the power plug (EXC-, EXC+) and the feedback line (SEN-, SEN+) are short-circuited. SEN+ and SEN- are used to compensate the power supply circuit resistors. SEN+ and EXC+ are methods, SEN- and EXC- methods. 2. EXC+ and EXC- are powered by the weighing instrument, but because the line between the weighing sensor and the sensor is broken, the operating voltage received by the sensor is actually less than the power supply voltage. Each weighing sensor has the characteristics of mV/V, and its output video stream is closely related to the receiving working voltage. SENS+ and SENS--in fact, the weighing instrument is in the high-characteristic impedance power supply circuit, and the weighing sensor can actually Accept the working voltage feedback to the load cell. Assuming that EXC+ and EXC- are 10V, the line is worn out, and the sensor is 1mV/V. In fact, the large data signal output of the sensor is ()*2u003d19mV instead of 50mV. At this time, 19mV is the large range of the weighing instrument. The prerequisite is that the sensor must feed back the specific working voltage to the load cell based on the feedback control loop. In the weighing instrument, EXC+ and SENS+short, EXC- and sens-short are connected to each other. Only when the sensor is close to the load cell and the working voltage damage is small, otherwise there will be data errors. 3. There are two types of verification of the weighing instrument method: 4-wire and 6-wire, the control module or socket of the weighing instrument and its 4-wire and 6-wire two kinds, first take out the wire to 4 or 6 and look at your hardware configuration. It is stipulated that the basic principle is: the sensor can be 6-wire instead of 4-wire, be sure to come up with 4 wires is a concise and clear answer. The above content is the detailed introduction of the wiring method of the weighing instrument. In the weighing system, four-wire sensors are used more. If you want to receive the six-wire sensor from the machine and equipment of the four-wire sensor, you can comment Positive feedback and positive encouragement are received together, and negative feedback and negative encouragement are received together. One thing to note about the power cord is that the matching output data signals of bright red and white on the two types of sensors are different.