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Why automatic door can not open and clsoe properly?

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Sometime automatic door can not open and close properly, why? There are two situations. One is the door re-open when closing the door a little. The other is the sliding door keep opening or closing.

One is the door re-open when closing the door a little
The reason is that the presence of interference in range of the sensor sensing area, such as: direct sunlight, an moving object, unstable light source. You can switch off the sensor signal lines to test whether the interference caused by the signal sensor, which automatic door can not be closed.
The other is door keep opening or closing
The reason is that the sensor is damaged and always have a door open signal input to the automatic sliding door controller. It may be automatic door operator's mode switch is adjusted to the open state, if it is installed access control systems, may be access control systems relay damage.

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