电动卷帘门用了一段时间之后，常见的问题就那么几个：按遥控没反应、门体升到一半停住、下降时哐当一声砸到底、运行噪音越来越大。很多人的第一反应是“电机坏了”，换了电机发现还是老样子。其实电动卷帘门的故障，大部分出在电机之外的三个地方。

After using the electric rolling shutter door for a period of time, there are a few common problems: pressing the remote control does not respond, the door body stops halfway up, it crashes to the bottom with a loud bang when it descends, and the running noise becomes louder and louder. Many people's first reaction is' the motor is broken ', but after replacing it, they find that it is still the same as before. In fact, most of the faults of electric rolling shutter doors occur in three areas outside of the motor.

限位开关，是非常容易被忽略的故障源。

Limit switches are the most easily overlooked source of faults.

限位开关的作用是控制门体升到顶、降到底时自动停止。它坏了会出现两种典型症状：一种是门体到了位置不停，电机继续转，卷轴上的帘片越卷越紧，非常后卡死；另一种是还没到位置就停，门关不严，留一条缝。限位开关的故障原因通常是触点氧化或机械磨损，调整或更换限位开关的成本不高，但很多维修工直接换电机，白花冤枉钱。判断方法很简单：手动操作门体升降，看限位位置有没有偏移，如果有，先查限位开关。

The function of the limit switch is to control the automatic stop of the door when it rises to the top or falls to the bottom. There are two typical symptoms when it breaks down: one is that the door body stops moving when it reaches its position, the motor continues to rotate, and the curtain on the scroll becomes tighter and tighter, eventually getting stuck; Another way is to stop before reaching the designated location, with the door not tightly closed and leaving a gap. The cause of limit switch failure is usually contact oxidation or mechanical wear. The cost of adjusting or replacing the limit switch is not high, but many maintenance workers directly replace the motor, wasting money. The judgment method is simple: manually operate the door to lift and lower, check if there is any deviation in the limit position, and if so, first check the limit switch.

导轨和卷轴的水平度，决定门体跑不跑偏。

The levelness of the guide rail and scroll determines whether the door will run off course.

卷帘门的帘片是在两侧导轨里上下滑动的，卷轴负责收放帘片。如果导轨安装不垂直，或者卷轴不水平，帘片运行时会偏向一侧，轻则摩擦导轨发出噪音，重则脱轨卡死。安装阶段的问题，用久了才暴露——导轨固定螺栓松动、墙体沉降、卷轴支架变形，都会导致跑偏。定期检查导轨垂直度和卷轴水平度，比等门卡死了再修更省事。

The curtain of the rolling shutter door slides up and down in the guide rails on both sides, and the scroll is responsible for retracting the curtain. If the guide rail is not installed vertically or the scroll is not horizontal, the curtain will tilt to one side during operation, which can cause noise when rubbing against the guide rail or cause derailment and jamming. The problems during the installation phase only become apparent after prolonged use - loose fixing bolts of the guide rail, wall settlement, and deformation of the scroll bracket can all lead to deviation. Regularly check the verticality of the guide rail and the levelness of the scroll, which is more convenient than waiting for the door to get stuck before repairing.

遥控和控制系统，故障率不比电机低。

Remote control and control systems have a failure rate no lower than that of motors.

遥控卷帘门的控制系统包括遥控器、接收器、控制主板。遥控器电池没电、接收器信号受干扰、控制主板继电器老化，都会导致“按了没反应”。有些故障是间歇性的——早上能开，中午开不了，下午又好了，这种情况多半是接收器信号问题或主板虚焊。排查时先换遥控器电池，再用备用遥控器试，如果都不行，再查接收器和主板。

The control system for remote-controlled rolling shutter doors includes a remote control, a receiver, and a control motherboard. Remote control batteries running low, receiver signal interference, and aging control motherboard relays can all lead to 'no response when pressed'. Some faults are intermittent - they can be turned on in the morning, not at noon, and then they get better in the afternoon. This situation is mostly due to receiver signal problems or motherboard virtual soldering. When troubleshooting, first replace the remote control battery, then try using a spare remote control. If it doesn't work, then check the receiver and motherboard.

电机坏不坏，看两个信号。

Whether the motor is broken or not depends on two signals.

电机真正损坏的概率其实不高。判断电机是否故障，看两个现象：一是电机发出嗡嗡声但门不动，可能是电容损坏或刹车抱死；二是电机完全不响，可能是过热保护跳了或者绕组烧了。第一种换电容就能解决，第二种才需要换电机。维修前先确认故障现象，别一上来就换电机。

The probability of actual damage to the motor is actually not high. To determine if the motor is faulty, look for two phenomena: one is that the motor makes a buzzing sound but the door does not move, which may be due to damaged capacitors or brake locking; Secondly, the motor is completely silent, possibly due to overheating protection tripping or winding burnout. The first method can be solved by replacing the capacitor, while the second method requires replacing the motor. Confirm the fault phenomenon before repairing, do not replace the motor immediately.

定期保养比坏了再修划算。

Regular maintenance is more cost-effective than repairing when it's broken.

卷帘门的保养不复杂：导轨定期清理灰尘杂物、涂抹少量润滑脂；链条或传动轴检查松紧度；限位开关每半年校验一次；遥控器电池一年一换。这些保养花不了多少时间，但能避免大部分突发故障。尤其是商铺和车库的卷帘门，每天开关好几次，保养到位和不到位，寿命差出好几年。

The maintenance of rolling shutter doors is not complicated: the guide rails are regularly cleaned of dust and debris, and a small amount of lubricating grease is applied; Check the tightness of the chain or transmission shaft; Limit switches should be calibrated every six months; The remote control battery is replaced once a year. These maintenance tasks may not take much time, but they can prevent most sudden malfunctions. Especially for the rolling shutter doors in shops and garages, they are opened and closed several times a day, and the maintenance is in place or not, resulting in a lifespan difference of several years.

电动卷帘门的故障排查逻辑很清晰：先查限位开关，再查导轨和卷轴水平度，然后排查遥控和控制系统，非常后才判断电机。换电机之前，先把前面三项排除了。

The troubleshooting logic for electric rolling shutter doors is very clear: first check the limit switch, then check the levelness of the guide rail and scroll, then check the remote control and control system, and finally determine the motor. Before replacing the motor, eliminate the first three items.

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