In the maintenance of a recent supermarket project, the fire shutter door cannot fall to the bottom at one time (about 20 cm from the ground) when it falls. You need to press the "fall" button again to fall to the bottom. This situation has nothing to do with the limit switch, mainly because the roller shutter is not set correctly.

跟大家分享一下济南卷帘门限位的调节：

First of all, let's share the adjustment of Jinan roller shutter threshold:

防火卷帘门限位动作演示视频如下所示，观察限位开关的动作变化及限位调节轮的移动变化。

The demonstration video of fire shutter threshold action is shown below. Observe the action change of limit switch and the movement change of limit adjusting wheel.

从视频中可以看出，卷帘限位的控制，是由转轴上两个小轮左右碰触微动开关来实现的。

It can be seen from the video that the control of roller shutter limit is realized by two small wheels on the rotating shaft touching the microswitch.

防火卷帘门

Fireproof rolling shutter door

两个限位调节轮在左右移动的过程中，触动两个微动开关。（注意，卷帘的上限位尽量不要随便调，或者要谨慎调节）

When the two limit adjustment wheels move left and right, they touch two microswitches. (note that the upper limit of the roller shutter should not be adjusted casually or carefully)

卷帘下限位调节方法：

Lower limit adjustment method of roller shutter:

要确定哪个是下限位的控制开关（将卷帘升到顶部，观察哪个微动开关处于“动作”状态，则该开关为上限位开关，另一个位下限位开关。这个不需要死记硬背。）

First, determine which is the lower limit control switch (raise the roller shutter to the top and observe which microswitch is in the "action" state, then the switch is the upper limit switch and the other is the lower limit switch. This does not need to be memorized.)

刚才找到了下限位开关，距离该开关更近的调节轮就是我们需要调整的。（调节轮距离下限位开关越近，下限位开关动作越提前，那么卷帘就越早的停止下降，即卷帘下降的距离短；反之，卷帘下降的距离越长）

Just now we found the lower limit switch. The adjusting wheel nearest to the switch is what we need to adjust. (the closer the adjusting wheel is to the lower limit switch, the earlier the action of the lower limit switch is, the earlier the rolling shutter stops falling, that is, the shorter the falling distance of the rolling shutter; on the contrary, the longer the falling distance of the rolling shutter.)

防火卷帘门

Fireproof rolling shutter door

比如卷帘下降距离太大，这时候我们需要让卷帘提起一点时间停止，那么将这个调节轮向靠近限位开关的方向移动即可，具体操作：

For example, the falling distance of the roller shutter is too large. At this time, we need to lift the roller shutter for a little time to stop. Then move the adjusting wheel to the direction close to the limit switch. The specific operation is as follows:

1、手动下降卷帘到合适位置停止。

1. Manually lower the roller shutter to the appropriate position to stop.

2、松开调节轮的固定螺丝，靠近限位开关方向移动，位置使限位开关“恰好”动作即可，拧紧调节轮固定螺丝即可。

2. Loosen the fixing screw of the adjusting wheel and move it close to the limit switch to make the limit switch "just" act. Tighten the fixing screw of the adjusting wheel.

3、升起卷帘，然后手动下降，观察设定的位置是否合适。

3. Raise the roller shutter, then lower it manually, and observe whether the set position is appropriate.

卷帘上限位的调节方法是相同的，需要注意的是上限调节不可太靠上，避免卷帘卷入卷轴，需要谨慎操作！

The adjustment method of the upper limit of the roller shutter is the same. It should be noted that the upper limit adjustment should not be too close to avoid the roller shutter from being involved in the reel. It needs to be operated carefully!

希望以上关于防火卷帘门控制上限和下限的方法，能够帮助到大家，如果您有关于防火卷帘门的问题，欢迎咨询我们。

I hope the above methods for controlling the upper and lower limits of fire shutter doors can help you. If you have any questions about fire shutter doors, please consult us.