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circuit diagramSelf-LockingA self-locking circuit uses the contactor’s normally open auxiliary contact to maintain the coil energized, ensuring the motor continues running. It is also called a start-stop holding circuit.Mutual LockingThe n...
Detecting Break Points in Frequently Damaged Cables (e.g., water pumps, extension power strips)Set the multimeter to the low AC voltage range. After powering the cable, slide the probe along the outer surface of the wire insulation.You will...
图1：位逻辑指令图2：数学函数1图3：数学函数2图4:数学函数3图5：计数器指令和比较指令图6：定时器指令
Common Standard Values for Grounding Resistance [*]Working grounding (functional grounding): Resistance ≤ 4 Ω [*]Protective grounding: [*]≤ 4 Ω (grounded neutral system) [*]≤ 10 Ω (ungrounded neutral system) [*]Repeated grounding: Re...
Live wire — LNeutral — NProtective earth — PEAlternating current — ACDirect current — DCNormally open — NONormally closed — NCPush button switch — SBSelector (rotary) switch — SAIsolator switch — QSAC contactor — KMIntermedi...
Most incidents are caused by an oversized circuit breaker combined with undersized conductors.
Measuring an electronic component while it is still soldered onto the circuit board (in-circuit measurement) is only for reference, because other components connected in the circuit will affect the reading.For example, if several capacitors...
Under normal conditions, the neutral wire will not give an electric shock.In reality, current does flow through the neutral wire. However, when you test the neutral with a voltage tester screwdriver, the tester will not light up.This is bec...
三相四线制带互感器的电表，如何接线 首先第一步 要先从断路器引出a b c三相火线 分别从这三个互感器的P1面穿入 然后连接到负载 第二步将这三个互感器的S1端 分别接到电表的147 互感器的S2 分别接电表的369端子 电表上标有258的接线端口 分别接上三根火线和工...
keil和vscode有什么区别我们可以看到 keil这里写了有三个功能 主要第一个叫编辑器 什么叫编辑器呢 就是平时我们在写代码 用的是编辑功能 比如我在这里 给这个结构 给这个枚举 加一个元素 是不是就按个回车 然后在这里直接写加一个元素 这就叫编辑好 然后编译...
10道题 第一个 是电动机的星角启动的电流大 为什么变频器总是出现错误报警 像过载报警等等 报警都错误 这个电流还没有超标 一句话解答 就是那个输出电缆线过长 容易出现干扰 造成了这种现象 这个照明电路 出现漏电 频繁跳闸 线路绝缘不合格 就会造成这样有漏...
Touching electricity with wet hands is more than 10 times more dangerous than with dry hands.Induced voltage and ghost voltage can also light up a test screwdriver; always verify with a multimeter.If the live and neutral wires are reversed...
There are several types of GND, each with specific functions and connection requirements.Analog GND (AGND) Used in analog circuits to provide a stable reference ground and reduce interference between analog signals. Digital GND (DGND) Conne...
为什么当零线带电 我们就能判定是零线断了呢 当零线断开了之后 零线和火线之间就行不成一个回路 那这段零线它就没有了电流通过 同时呢也不会有压降 这个时候 量断点之前的这段零线的时候 它其实就带电了 而且它的电压也是220伏左右 那么这个时候我们就可以判...
Digital signals, analog signals, and pulse signals are three very common types of signals used in automation systems.[hr]1. Digital Signals (Discrete / Switching Signals)Digital signals (also called switching signals) have only two possible...
1. Open CircuitAn open circuit occurs when a conductor is broken and the current path is interrupted. In simple terms, the wire is disconnected, so current cannot flow and the load stops working.[hr]2. Short CircuitA short circuit occurs wh...
如何能够获得三项220电伏的电压 大家知道这个380的三相很常见 接下来就是三项380 如何获得三相220V电压 因为我们常用一些设备 大量的设备 使用三相的220伏电源 使用变频器，380的电变成220的电，虽然是三相变过来之后呢，变频器是把两相的220，变成了三项的22...
A Megger produces high voltage and very low current, so safety is important. Never touch both test terminals with your hands during operation.[hr]1. Checking Whether the Megger Works ProperlyStep 1 – Open-circuit testConnect the Megger lea...
AC and DC Intermediate Relays — Principle, Usage, and ApplicationsAn intermediate relay is an electrical switching device widely used in control circuits. Its main purpose is to use a low-current control signal to switch or control higher-...
Today I encountered a strange problem while using my computer and spent quite a long time troubleshooting before finally solving it.[hr]The IncidentAt home I plugged my electric scooter charger into the same power strip as my computer. Afte...
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