1、 When the rolling shutter door stops in the middle, the door body slides, which is usually caused by the sliding of the internal brake of the driving motor, and is usually caused by the following reasons

1、卷帘门的抱闸摩擦片有油污，可以拆下摩擦片用清洗剂清洗后重新安装。

1. The brake friction plate of the roller shutter door has oil stains, which can be removed and cleaned with cleaning agent before reinstalling.

2、压缩弹簧老化，压力减小，需要更换弹簧。

2. The compression spring is aging and the pressure decreases, requiring replacement of the spring.

3、电磁铁组装不正确，抱闸压盘不能准确回位；需要拆下重新组装。

3. Incorrect assembly of the electromagnet and inaccurate return of the brake pressure plate; It needs to be disassembled and reassembled.

二、卷帘门的链条拉不动，原因主要有：

2、 The chain of the roller shutter door cannot be pulled, mainly due to:

1、链条环堵住十字槽；将链条理顺再试。

1. The chain ring blocks the cross groove; Straighten the chain and try again.

2、抱闸不能释放，释放装置被卡住；检查并排除。

2. The brake cannot be released, and the release device is stuck; Check and eliminate.

三、卷帘门不能上下开关，电机不起动。原因排查,可由以下几点判断

3、 The roller shutter door cannot be opened or closed, and the motor does not start. The cause investigation can be determined from the following points

1、电路断开,检查电线。

1. Disconnect the circuit and check the wires.

2、运转电容损坏,更换运转电容。

2. The operating capacitor is damaged, replace it.

3、过热保护失效。更换过热保护器。

3. Overheat protection failure. Replace the overheat protector.

4、长时间未运行抱闸粘住。手动链条拉动转几下，释放抱闸。

4. Holding brake stuck after not running for a long time. Manually pull and rotate the chain a few times to release the brake.

5、限位开关常闭触点不通,打磨触点或更换限位开关。

5. The normally closed contact of the limit switch is not working, polish the contact or replace the limit switch.

6、继电器线圈坏或氧化,沾污,更换继电器。

6. If the relay coil is damaged or oxidized, contaminated, replace the relay.

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