A common fault reason analysis C6140T lathe electrical wiring

Fault phenomenon: the spindle motor M1 can't start. Cause analysis: (1) there is no voltage control circuit. (2) in the control circuit fuse FU5 fusing. (3) contactor KM1 not suck, press start button SB2, contactor KM1 without action, the fault must be in the control circuit, such as button SB1, SB2 contact contact undesirable, contactor coil break line, can cause KM1 cannot live action. If when the SB2, contactor and, but spindle motor can't start, the cause of the problem must be in line, can, in turn, check the contactor KM1 main contact and terminals of three-phase motor is in good contact. Fault phenomenon: the spindle motor stalling. Cause analysis: this kind of fault are mostly because of the contactor KM1 core oil on the surface of the core cannot release or KM1 main contact welding, or stop button SB1 caused by the normally closed contact of the short circuit. Should be cut off power supply, clean core surface dirt or replace contact, troubleshooting. Fault phenomenon: the spindle motor operation cannot be self-locked. Cause analysis: when pressing the button SB2, electric function, but relax button after motor stalling, is due to the auxiliary normally open contacts of contactor KM1 poor contact or position offset, jam phenomenon caused by the fault. At this time as long as auxiliary normally open contacts of contactor KM1 troubleshooting for repair or replacement. Auxiliary normally open contacts of the wires are loose or break also can make the motor cannot be self-locked. Fault phenomenon: cause analysis tool post fast moving motor cannot run: press inching button SB3, contactor KM3 not suck, failure will be in the control circuit, the button SB3, checkpoint movable contactor whether KM3 coil circuit. Fault phenomenon: M1 can start, can't braking energy after starting the spindle motor M1, to achieve energy consumption braking, SQ1 can only hit the travel switch. If hit the journey switch SQ1, cannot achieve energy consumption braking, its fault phenomenon usually have two kinds, one kind is the motor M1 can stop naturally, the other is a motor M1 cannot stop, still turn. Cause analysis: SQ1, hit the travel switch can't realize the braking energy, the scope of its failure may be in the main circuit, can also be in the control circuit in the circuit. There are three kinds of methods. 1) be determined by the fault phenomenon when on the travel switch SQ1, if electric function natural park, control circuit of KT ( 02 - 03) KT coil to CLP can disconnect, time relay, and not the cause of the brake is whether the contactor KM4 action. KM4 movement, the point of failure in the main circuit; KM4 not action, point of failure in the control circuit. When on the travel switch SQ1, if electric function cannot stop, control circuit of KT ( 02 - 03) Can't disconnect the contactor coil of KM1 power is released, causing the motor without a stop, the point of failure in the control circuit, then you can check whether the relay coil of KT to electricity. (2) be determined by the electric action of SQ1 when on the travel switch during braking energy, over and over again to observe the armature of KT and KM4 presence of suction in action. If KT and KM4 armature and successively, the fault point must be in the main circuit of braking energy branch; KT and KM4 armature as long as there is a not suck, the point of failure will be in the control circuit of the braking energy branch. (3) to make the contactor KM4 armature and if still cannot achieve energy consumption braking, at this time of point of failure in the main circuit; If can realize braking energy at this time, it can't achieve energy consumption braking of the cause of the problem is not in the main circuit, will be in the control circuit.