3. The circuit fault
Reference to picture 2 , the microswitch for limited the up and down travel distance is not fault to give signal to drive board to give
travel instruction . The method for checking the fault is two step .
1) Reference to picture 2 , check the wire which is for connect the CON22 plug in drive board with the microswith , whether the wire
plug is good connected .
2) Check whether the microswitch with fault.
▲ The method to check the microswitch fault
The microswitch is often used in the circuit detection, such as the back massage hand go back and forth extend limited, travel motor
go up and down limited, cylinder inside travel limited, safety switch detection . The inside construction and work principle are the
same. See picture 17 ,
① : Dynamic contact、②:COM public side③ “NO” Normally open contacts、
④ “NC” normally closed contactsen contacts。 Pls use the multimeter Buzzer file to check it. normally closed NO：④②in normal
situation it is closed to conduction，①working, the④② will opening.
Normally open contacts NC：③②in normal situation it is open without conduction，①working,
③② will conducting.
Voltage output of travel motor
Chip SMT132F103 signal control
Picture 18, travel motor circuit figure
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