The JLS205 (or 206) offset press sometimes fails to achieve maximum speed during operation. In its many reasons.
1. Circuit lacks phase or undervoltage operation;
2. The corresponding normally open contacts of the increase and deceleration relays are closed;
3. The output voltage of the control circuit is insufficient.......). The output currents of the six thyristors in the top-number main circuit are inconsistent (the difference between large and small is more difficult to repair). This is because: To troubleshoot such failures, it is usually necessary to use a dual trace oscilloscope to re-adjust the trigger angles of its six flip-flops to make them consistent. The output current of the six thyristors in the main circuit also recovers. Before troubleshooting. The use of double-track oscilloscopes to adjust the operating procedures, more time-consuming, especially at night or when production tasks are tight, it is not very appropriate, and then encountered the oscilloscope at this time (or in use) also have problems, then Even more annoying or unpredictable.
In order to solve this problem, I developed a clamp-type ammeter to measure the current value of each thyristor AC input line instead of measuring the trigger angle of each trigger with a dual-track oscilloscope (in fact, it is measured indirectly by measuring the current of each thyristor). The method of triggering the angles of each trigger is simple and practical, and can basically achieve the purpose of prompt troubleshooting (and there is no possibility that the clamp ammeter may cause problems in use). Specific description is as follows (this method requires two people to cooperate with maintenance):
After the front and rear doors of the power distribution cabinet are opened, the low speed operation is started and the speed is increased to medium speed. A person at the rear door of the distribution cabinet, holding a clamp ammeter, measuring the AC line current values ​​of the six thyristors in the main circuit, and make a corresponding record, and then report to the front door side ready to six trigger The person who triggers the angle adjustment is allowed to adjust (the person standing on the side of the front door should loosen the lock nut of the “slope†potentiometer on the six triggers in advance so that it can be adjusted with the electric pen). According to the measured current, the minimum and maximum ones should generally be selected. Because the current of one thyristor (due to adjustment) in the three-phase full-controlled rectifier circuit changes, it will cause a chain reaction in the current of the entire circuit—the operating current that affects the other thyristors also occurs. Change, and the greater the change in the current of the adjuster, the greater the influence on the current of the other or some other thyristors. Therefore, when adjusting the “slope†potentiometer, it should be fine-tuned and not too large; otherwise It is possible that the circuit will be more and more chaotic.
For example, if the output current of No. 1 SCR1 is measured with a clamp ammeter and the output current of No.6 SCR6 is 18A, the output current of other SCRs is measured. 9A or so, then the current reference value of the entire circuit should be about 9A; 9A can be used as the reference value, fine-tune the "slope" potentiometer of the No. 1 flip-flop to gradually increase its output value - the output of the SCR No. 1 The current is gradually increased from 2A (for example, it is increased to 6-7A), and then whether the output current of SCR 6 has been reduced by 18A (for example, it has dropped to 13-14A)? If there are changes, indicating that the adjustment is effective, then the No. 1 trigger will continue to be fine-tuned so that the output current of No. 1 SCR will continue to rise, and the output current of No. 6 SCR will follow down until it reaches the ideal value of 9 A (can also be reversed. Come here and fine-tune the "slope" potentiometer of the 6th trigger to make the output value of the 6th trigger smaller - the output current of the 6th SCR drops, and at the same time force the output current of the 1st SCR to rise, until both To achieve the desired value of 9A); or alternately adjust the two (1 and 6) flip-flops (this is to adjust a flip-flop so that the thyristor current changes, but can not make another thyristor current also occurs The same proportion of the reverse change, or both can not reach the normal value after the change, but there are some differences, this time you need to use alternating and coordinated adjustment method to work), so that the respective control of the SCR output current Gradually tends to be consistent. Then measure the operating current of several other thyristors - see if there is no influence of the regulation and make the current rise and fall. If yes, they can be adjusted separately according to the circumstances...
When the operating currents of the six thyristors are adjusted to be consistent (normal), the machine speed will increase synchronously; then press “growth†to increase the speed as much as possible – to see if it can be achieved Highest speed? If it can reach the highest speed, it means that the adjustment is successful; if it fails to reach the highest speed, the clamp current meter can be used to measure the AC line current values ​​of six thyristors at high speed, and the difference among them is selected. Respectively, make fine adjustments until the output currents of the six thyristors converge, and the speed can be increased to the maximum speed. Then press deceleration to shut down the machine after the speed is reduced to low speed operation. To check whether the fault has been completely eliminated, restart the system (including jog, low-speed operation, increase and deceleration) and try again. After correcting, re-tighten the locking nuts of the “slope†potentiometer on each trigger.
1. Circuit lacks phase or undervoltage operation;
2. The corresponding normally open contacts of the increase and deceleration relays are closed;
3. The output voltage of the control circuit is insufficient.......). The output currents of the six thyristors in the top-number main circuit are inconsistent (the difference between large and small is more difficult to repair). This is because: To troubleshoot such failures, it is usually necessary to use a dual trace oscilloscope to re-adjust the trigger angles of its six flip-flops to make them consistent. The output current of the six thyristors in the main circuit also recovers. Before troubleshooting. The use of double-track oscilloscopes to adjust the operating procedures, more time-consuming, especially at night or when production tasks are tight, it is not very appropriate, and then encountered the oscilloscope at this time (or in use) also have problems, then Even more annoying or unpredictable.
In order to solve this problem, I developed a clamp-type ammeter to measure the current value of each thyristor AC input line instead of measuring the trigger angle of each trigger with a dual-track oscilloscope (in fact, it is measured indirectly by measuring the current of each thyristor). The method of triggering the angles of each trigger is simple and practical, and can basically achieve the purpose of prompt troubleshooting (and there is no possibility that the clamp ammeter may cause problems in use). Specific description is as follows (this method requires two people to cooperate with maintenance):
After the front and rear doors of the power distribution cabinet are opened, the low speed operation is started and the speed is increased to medium speed. A person at the rear door of the distribution cabinet, holding a clamp ammeter, measuring the AC line current values ​​of the six thyristors in the main circuit, and make a corresponding record, and then report to the front door side ready to six trigger The person who triggers the angle adjustment is allowed to adjust (the person standing on the side of the front door should loosen the lock nut of the “slope†potentiometer on the six triggers in advance so that it can be adjusted with the electric pen). According to the measured current, the minimum and maximum ones should generally be selected. Because the current of one thyristor (due to adjustment) in the three-phase full-controlled rectifier circuit changes, it will cause a chain reaction in the current of the entire circuit—the operating current that affects the other thyristors also occurs. Change, and the greater the change in the current of the adjuster, the greater the influence on the current of the other or some other thyristors. Therefore, when adjusting the “slope†potentiometer, it should be fine-tuned and not too large; otherwise It is possible that the circuit will be more and more chaotic.
For example, if the output current of No. 1 SCR1 is measured with a clamp ammeter and the output current of No.6 SCR6 is 18A, the output current of other SCRs is measured. 9A or so, then the current reference value of the entire circuit should be about 9A; 9A can be used as the reference value, fine-tune the "slope" potentiometer of the No. 1 flip-flop to gradually increase its output value - the output of the SCR No. 1 The current is gradually increased from 2A (for example, it is increased to 6-7A), and then whether the output current of SCR 6 has been reduced by 18A (for example, it has dropped to 13-14A)? If there are changes, indicating that the adjustment is effective, then the No. 1 trigger will continue to be fine-tuned so that the output current of No. 1 SCR will continue to rise, and the output current of No. 6 SCR will follow down until it reaches the ideal value of 9 A (can also be reversed. Come here and fine-tune the "slope" potentiometer of the 6th trigger to make the output value of the 6th trigger smaller - the output current of the 6th SCR drops, and at the same time force the output current of the 1st SCR to rise, until both To achieve the desired value of 9A); or alternately adjust the two (1 and 6) flip-flops (this is to adjust a flip-flop so that the thyristor current changes, but can not make another thyristor current also occurs The same proportion of the reverse change, or both can not reach the normal value after the change, but there are some differences, this time you need to use alternating and coordinated adjustment method to work), so that the respective control of the SCR output current Gradually tends to be consistent. Then measure the operating current of several other thyristors - see if there is no influence of the regulation and make the current rise and fall. If yes, they can be adjusted separately according to the circumstances...
When the operating currents of the six thyristors are adjusted to be consistent (normal), the machine speed will increase synchronously; then press “growth†to increase the speed as much as possible – to see if it can be achieved Highest speed? If it can reach the highest speed, it means that the adjustment is successful; if it fails to reach the highest speed, the clamp current meter can be used to measure the AC line current values ​​of six thyristors at high speed, and the difference among them is selected. Respectively, make fine adjustments until the output currents of the six thyristors converge, and the speed can be increased to the maximum speed. Then press deceleration to shut down the machine after the speed is reduced to low speed operation. To check whether the fault has been completely eliminated, restart the system (including jog, low-speed operation, increase and deceleration) and try again. After correcting, re-tighten the locking nuts of the “slope†potentiometer on each trigger.
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