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Alarm message of LCD panel–Machine protected（New type sensor)
Release Time：2022/02/18 troubleshooting Browsing Times：373
LCD panel shows the following information:
Let’s learn how the door protection sensor works before we start.
Our machine has sensors for door protection, we’ve installed 5 door sensors totally. 2 mounted at
top flap, 1 mounted at the front door, 1 mounted at the left-up side door, 1 mounted at laser tube
cover. See below picture.
Each door sensor is being detected by a door sensor checking board. This board is installed in the
right side door for nova35, 51, 63 or left side door for nova24.
About door sensor checking board interface description：
|1:||24V DC Voltage Power Input||7 :||spare interface of Signal Input|
|2:||Signal Input for door sensor of S5||8 :||Signal Input for door sensor of S3|
|3:||Spare interface of Signal Input||9 :||Signal Input for door sensor of S2|
|4:||Signal Input for door sensor of S7||10:||Signal Input for door sensor of S1|
|5:||spare interface of Signal Input||11:||Signal Output,where signal to controller board|
|6:||"Maintenance" button||12:||Spare interface of Signal Output|
Each interface has a LED light to indicate the status, the yellow light for interface of signal input
will be on while door sensor with same label is closed,once all doors with sensors installed are
closed,the red light for signal output will be on and then send the signal to controller board.
How to check when the LCD panel is getting the error of “Machine protected”?
l The Door with sensor not close
Please close all of them before starts to work.
l The door sensor is not working
Please find the door sensor checking board,then check status of yellow light for interface of signal
input,the light will be off if door sensor is not working.
Find the corresponding position of door sensor according to the wire label.
Order: S1= left side of top flap, S2 = right side of the top flap , S3= the front door, S5 = laser
tube cover, S7 = left-up side door.
1）The connector of door sensor is loose
Please check if the connector for corresponding position of door sensor is loose or not,see below
2）Poor contact between the actuator and the sensor
Please adjust the position of the actuator or sensor to align them. If the position is fine and the
yellow light is still off from the checking board,this door sensor should be bad .
If each door sensor is fine and their yellow light is on from checking board,and also the red light
for signal output is on,please go to the next step.
l The wires of DrProc and GND on CN2 is loose from controller board.
Please check and confirm they are tight.
If your machine was produced before September 2019, the door sensor checking board is not
installed on your machine. Please check the machine according to below link.
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