(This article is an original article from Bisheng. It is forbidden to reprint, and reprinting must be corrected)
There are three main reasons for common failures in the J2108A circuit. One is the electrical failure caused by mechanical failure; the second is the failure of the electrical itself; the third is the electrical failure caused by changes in the ambient temperature and humidity. The main electrical faults of the J2108A offset press are now analyzed as follows:
Fault 1: The motor does not start.
Failure analysis:
1. The power is not connected; 2. The winding is disconnected; 3. The stator winding is short-circuited between phases; 4. The stator winding is grounded; 5. The phase is missing.
Troubleshooting:
1. Check the switch, fuse, each contact and the lead wire of the motor; 2. Check the open circuit and eliminate the fault; 3. Check the short circuit and eliminate the fault; 4. Use a megohmmeter to measure the resistance of the motor to ground, which should not be less than 0.5MΩ Check incoming power and fuses.
Fault 2: The motor is overheated.
Failure analysis:
1. The power supply voltage is too high or too low; 2. The stator phases are short-circuited; 3. One of the three-phase power supplies or stator windings is open; 4. Overload; 5. The ambient temperature is too high or the ventilation is not smooth.
Troubleshooting:
1. Check the three-phase power supply; 2. Check the insulation resistance between the three-phase power supply and the current stator phase and ground; 3. Check the power supply voltage and fuse and the current of each phase; 4. Check the load current; 5. Check the ambient temperature and ventilation holes .
Fault 3: Analysis of breakdown breakdown of slip clutch insulation:
1. The insulation is damp; 2. Heating generates large eddy currents; 3. The input voltage exceeds the rated value.
Troubleshooting:
1. Check the ambient temperature; 2. Check the load current; 3. Check the output voltage (0-90V) of the electromagnetic speed controller and replace it after troubleshooting.
Fault 4: Unstable speed.
Failure analysis:
1. The speed of the tachogenerator is unstable; 2. One phase of the three-phase winding of the tachogenerator is broken, the brushes are in poor contact, and the bearings are worn; 3. The bearing of the tachogenerator is stuck and wet; 4. The electromagnetic speed controller has malfunction.
Troubleshooting:
1. Check that the three-phase output voltage of the tachogenerator should be balanced and should not fluctuate; 2. Check that the three-phase winding values ​​should be symmetrical, whether the bearings are normal, and whether the brushes are in good contact; 3. Check the bearings, check the ambient temperature; The components of the electromagnetic speed controller.
Fault five: The control circuit is turned on and the fuse is broken.
Failure analysis:
1. Load short circuit 2. Wire short circuit between phases.
Troubleshooting:
1. Eliminate the fault and replace it; 2. Check the short circuit point of the wire to repair it.
Fault six: The contact of the AC contactor burns.
Failure analysis:
1. The pressure of the contact spring is too small; 2. There is grease on the contact; 3. The capacity of the contact is not enough.
Troubleshooting:
1. Adjust the spring pressure; 2. Remove dirt; 3. Replace larger electrical appliances.
Failure 7: Failure analysis of contact welding together:
1. The contact is overheated; 2. The opening capacity of the contact is not enough; 3. The number of opening of the contact is too many.
Troubleshooting:
1. Eliminate the cause of overheating; 2. Replace the larger capacity components; 3. Replace the contacts.
Fault eight: coil burnout fault analysis:
1. The spring reaction force exceeds the ambassador coil heating; 2. The coil voltage does not match the actual circuit voltage.
Troubleshooting:
1. Adjust the spring pressure; 2. Replace the coil.
Fault 9: Failure analysis of armature absorption:
1. The coil is broken or burned; 2. The armature or movable part of the mechanism is stuck.
Troubleshooting:
1. Repair and replace; 2. Remove obstacles.
Failure ten: Analysis of noise failure:
1. The power supply voltage is too low; 2. The contact spring pressure is too large; 3. The magnetic system is skewed or mechanically stuck, so that the iron core cannot be flattened; 4. The iron core magnetic surface is rusted or has oil dirt and dust; Fracture; 6. The magnetic surface of the iron core is excessively worn and uneven.
Troubleshooting:
1. Increase the operating circuit voltage; 2. Adjust the contact spring pressure; 3. Eliminate the mechanical jamming fault; 4. Clean the iron core magnetic surface; 5. Replace the iron core or weld the short-circuit ring; 6. Replace the iron core.
Fault 11: Contact failure analysis:
1. The distance between the contacts is too large without overtravel 2. The contacts are off; 3. The contacts are not clean; 4. The moving parts are stuck.
Troubleshooting:
1. Adjust the contact parameters; 2. Replace the contacts; 3. Clean the contacts; 4. Remove the stuck fault.
Fault 12: The electric bell does not ring Fault analysis:
1. Fuses FU6 or FU8 are blown; 2. Poor contact of the fuse; 3. Poor contact of the electric bell; 4. Broken electric bell; 5. Poor contact of the electric bell button SB7-9.
Failure analysis:
1. Check and eliminate the fault, replace; 2. Check whether the fuse contact is good; 3. Check whether the bell contact is good; 4. Replace; 5. Repair and replace.
Fault 13: Failure analysis of low-speed motor not running:
1. Phase loss; 2. Whether the intermediate relay KA2 is engaged; 3. Whether the SB11 button is in good contact; 4. Low speed motor failure; 5. Low speed clutch brake is not released; 6. Low speed clutch coil is burnt out or poor contact; 7. Thermal relay FR2 is not turned on or has poor contact.
Troubleshooting:
1. Check the power supply voltage; 2. KA2 pull in, check KM2; KA2 does not pull in, check whether the KA2 coil is normal; 3. Check whether SB11 is normal; 4. Check whether the low speed motor is normal; 5. Check whether the low speed clutch brake is released ; 6. Check if the low speed clutch coil is normal; 7. Check FR2, reset, repair.
Fault 14: Jog does not work.
Failure analysis:
Punctuality: 1. Whether the punctual button SB13-15 is in good contact; 2. whether KM2 is normal; 3. whether FR2 is normal;
Anti-point: 1. Whether the anti-point button switch SB17-19 is normal; 2. whether KM3 is normal; 3. whether FR2 is normal.
Troubleshooting:
On time: 1. Check SB13-15, repair 2. Same as above 3. Same as above.
Anti-point: 1. Check SB17-19, repair and replace; 2. Check whether KM3 is working, if it works, check whether the normally open contact of KM3 is in good contact; if it does not work, check whether the coil of KM3 is normal and whether FR2 is normal.
Fault 15: Failure analysis during operation:
1. The AC contactor KM1 does not pull in; 2. Whether the SB21 is in good contact or the spring is stuck; 3. The SB21 is bad; 4. The FR1 is in poor contact or jumps away.
Troubleshooting:
1. Check whether the KM1 coil is normal, such as KM1 pull-in, check whether the normally open contacts 3-9 of KM1 are in good contact; 2. Repair, replace; 3. Replace; 4. Repair, reset.
Fault 16: Failure analysis of fixed speed failure:
1. Intermediate relay KA3 does not work, it may be the coil is burnt out, or it may be poor contact; 2. The button switch SB23 has poor contact; 3. SB23 is bad; 4. SB21 is normal; Whether the contact is good; 6. Whether the normally open contact 3-14 of KA3 is connected to the electromagnetic speed controller circuit.
Troubleshooting:
1. Replace, repair; 2. Repair; 3. Replace; 4. Check whether SB21 is normal; 5. Check whether the normally closed contacts 2-18 of KA5 are normal; 6. Check whether the normally open contacts 3-14 of KA3 are good .
Failure 17: Failure to adjust speed Failure analysis:
1. The fuse of the electromagnetic speed controller is burnt out 2. Whether the speed potentiometer WT2 is good; 3. The electromagnetic speed controller fails.
Troubleshooting:
1. Replace; 2. Check whether WT2 is normal; 3. Check each component of EA2.
Fault 18: Failure analysis of out-of-pressure fault:
1. Defective closing relay KA9; 2. KA9 coil coil burned out; 3. Poor contact of the piezoelectric magnet YA4 or coil burned out; 4. Empty over-controlled electrical teeth to contact the ground; 5. Metal detector deviated from magnetic switch SQ9; 6. Poor contact or burnout of KA6 coil; 7. Failure of all components of the pressure circuit.
Troubleshooting:
1. Maintenance; 2. Replacement; 3. Maintenance or replacement; 4. Maintenance, inspection of electrical teeth; 5. Maintenance; 6. Maintenance, replacement; 7. Inspection of the components of the pressure circuit.
Fault 19: Failure analysis of non-pressure separation:
1. The paper feed button SB03 has not been reset; 2. The electromagnetic switch SQ8 is out of control; 3. The empty teeth are over-controlled to control the electric teeth without electric shock; 4. The KA5 armature is stuck or cannot be sucked.
Troubleshooting:
1. Repair to reset SB03; 2. Repair or replace; 3. Repair to touch the ground; 4. Repair or replace.
Fault 20: Failure analysis of paper feeding failure:
1. Poor contact or burnout of the paper feed clutch YA02; 2. Poor contact or burnt out of the paper feed relay KA01; 3. Over-over control of the electrical teeth to make the KA5 pull; 4. SQ06, SB04, SB05, SB06 Whether the contact is good; 5. The double-sheet control relay KA04 has been pulled in.
Troubleshooting:
1. Repair or replace; 2. Repair or replace; 3. Check that the empty contact control contacts (electric teeth) should not be grounded; 4. Check whether SQ06, SB04, SB05, SB06 are normal; 5. Eliminate the double-sheet control failure.
Trouble 21: Failure analysis of automatic rise of paper feed:
1. Limit switch SQ07 has poor contact or broken; 2. Intermediate relay KA02 has poor contact or coil burned; 3. Paper clutch YA02 has poor contact or burned; 4. Paper feeding automatic ascending circuit malfunction.
Troubleshooting:
1. Repair or replacement; 2. Repair or replacement; 3. Repair or replacement; 4. Check each component of the paper automatic ascending circuit.
Trouble 22: Failure analysis when the main paper receiving table is automatically lowered:
1. The limit switches SQ12 and SQ17 have poor contact or broken; 2. The micro switch SQ13 has poor contact or broken; 3. The coil of the AC contactor KM5 has poor contact or burned; 4. The phase is missing; 5. Overload.
Troubleshooting:
1. Repair or replace; 2. Repair or replace; 3. Check whether KM5 is good; 4. Check fuse FU4; 5. Check the cause of overload and reset FR4.
Trouble 23: The secondary cardboard does not move.
Failure analysis:
1. Poor contact or coil burnout of transistor time relay KT1; 2. Poor or broken contact of magnetic switch SQ15; 3. Metal detector displacement; 4. Poor or broken contact of limit switch SQ12; 5. AC contactor KM8 Poor contact or coil burnout; 6. Overload; 7. Phase loss.
Troubleshooting:
1. Repair or replace; 2. Repair or replace; 3. Reset; 4. Repair or replace; 5. Repair or replace; 6. Check the cause of overload, reset FR7; 7. Check the reason and replace with fuse.
Fault 24: The clutch speed cannot be adjusted, but can only run at high speed but not at low speed (out of control)
Failure analysis:
1. No-load slip operation; 2. Troubleshooting without feedback:
1. Add a certain load; 2. Increase the feedback amount, rotate WT4 counterclockwise, and adjust it to a certain required speed.
Fault twenty-five: Turn on the power switch fuse blowout fault analysis:
1. Load short circuit; 2. Lead wire short circuit; 3. Transformer primary short circuit; 4. SCR breakdown.
Troubleshooting:
1. Check whether the clutch coil is normal; 2. Check whether the output voltage wire is short-circuited; 3. Check whether the transformer is normal; 4. Check whether the thyristor is normal, or replace it.
Fault 26: The indicator light of the power switch is on, the clutch of the rotating speed control knob does not work. Fault analysis:
1. T1, T2 open circuit; 2. Speed ​​control knob open circuit; 3. G2 damaged; 4. G1 damaged; 5. SCR open circuit; 6. Poor contact of printed circuit socket; 7. Transformer B3, 4, 5, 6, 11, 12,13,14 Whether there is voltage.
Troubleshooting:
1. Check whether T1 and T2 are in good contact and whether there is DC voltage; 2. Check WT1, adjust WT2, and measure the terminal voltage of R5 should change at 4-6V; 3. Check and replace G2; 4. Check and replace G1; Check SCR; 6. Check whether the printed circuit board socket is normal; 7. Check whether the voltage on the secondary side of the transformer is normal.
Fault 27: When the WT2 has been adjusted to zero, there is still a fault voltage output fault analysis:
1. The ambient temperature is too high; 2. Improper start zero adjustment;
Troubleshooting:
1. Reduce the indoor temperature to below 45 degrees; 2. Adjust WT5 so that there is no output of SCR when WT2 is at zero position.
Fault 28: The speedometer does not match the actual speed, or cannot be adjusted (low)
Failure analysis:
1. The speed measuring generator is demagnetized; 2. The speed measuring generator has one phase short circuit or broken wire.
Troubleshooting:
1. Adjust WT3; 2. Check whether the three-phase voltage of the speed measuring generator is symmetrical.
Fault 29: The clutch can only run at low speed but cannot increase the speed. Fault analysis:
1. The feedback amount is too large; 2. Diode D26 breakdown or open circuit.
Troubleshooting:
1. Adjust WT2 to reduce the feedback amount, adjust WT2 to increase the given amount; 2. Replace D2.
Above we have conducted some analysis on the more common faults of the J2108A printed circuit, and the electrical symbols in it are based on the J2108A machine with the circuit diagram.
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