What does this instrument symbol mean? (see picture)
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M should refer to the motor. What does the Xl attached below mean?
The block diagram below M should tell you how to connect the motor, XL refers to the power distribution box； The number under XL is "220 space 2B", 220 refers to the voltage of 220V ； 2B should refer to method: Using branch voltage and branch current as variables, write the current (KCL) equation for the node, write the voltage (KVL) equation for the loop, and then write the voltage and current relationship equation for each branch, referred to as the branch equation. This results in 2b independent equations containing 2b variables. Also known as the "2B method".
Reply 2# runisuoshi There is a problem with my drawing. There is no space between 2202B. 2202B refers to the design number of our device. I only drew one of them, and the other pump is 2202A, which refers to the bit number. I mainly want to know what XL stands for, but thank you for your answer.
It should be the status indication of the motor displayed by the DCS. After the pump motor stops, the DCS will display the XL2202B alarm prompt. In addition, are there two pumps in lz, one as a backup for each other, one is A and the other is B?
Reply 4# timwangwt Well, there are two pumps, one for A and one for B as a backup.
Popularize a knowledge: outer box: It represents the DCS signal, and the circle with a horizontal line represents the remote transmission instrument, so this is the DCS instrument number that displays the operating status of the pump.
XL is meaningless, it just tells you that it is a 2B pump. Just a bit number. That's all
XL-2202B is the motor fault status indication... The signal from MCC usually also has XA alarm, start/stop [for high-voltage motors, the start and stop are usually made into two (see the electrical major for details)]
Every point of view: pump: It refers to the process pump, which is driven by a motor. M: For Motor XL: Is the motor running signal
You can check it from the instrument control chart with nodes, it is written very clearly.
Reply 1# yunfdk XL indicates the pump operating signal, usually from MCC.