Do you know the basics of frequency maintenance? Here's the basics of frequency maintenance for you:
I. Maintenance static testing of the variant
1. Test of current circuits
If the results are found, the circuit can be judged to be abnormal. A. At the p. N end of the dc power source in the inverters, adjust the spare meters to the resistance x10, the red pole to p and the black pole to r and s, respectively. In general, there are dozens of om of resistance values, which are essentially balanced. On the contrary, the black pole is attached to the p end and the red pole is followed by r. S. T. The barrier is close to infinity. Connect the red instrument stick to the n end, repeat the above steps, and you deserve the same result. If there is a three-sided imbalance with the resistance value, this indicates a failure of the whole stream bridge. When the red pole is connected to the p end, the barrier is unlimited and it is possible to conclude that the whole flow bridge is malfunctioning or that there is failure to activate the resistance。
2. Test reverse circuits
Connects the red instrument pole to the p endpoint and the black instrument pole to u. V. And w., respectively. There should be dozens of om of resistance values, which are essentially the same, with an infinite response. The black table is placed on the end of the n and the above steps are repeated, with the same result, otherwise the failure of the reverse module can be judged。
Ii. Dynamic testing
When the static test results are normal, dynamic tests can be performed, i. E. The test machine can be activated. The following points must be noted before and after the electricity is installed:
1. Confirms the correctness of the input voltage prior to the powering. 220v retroverts connected to 380v power sources cause explosions (explosive capacitation, voltage-sensitive electrical resistance, modules, etc.);
2. Checks whether the reversible connectors are correctly connected and whether the connection is loose. Anomalous connections sometimes lead to inverters malfunctions and can explode in serious cases;
Iii. The detection of electrically activated malfunctions indicates their content and a preliminary determination of the failure and its causes;
If no malfunction is shown, the retroverts are activated by the empty (unconnected) vehicle, and the u. V. W. 3-phase output voltage values are tested, and the module or drive plate is malfunctioned, etc., after checking whether the parameters are abnormal;
When the output voltage is normal (non-discretionary, three-phase balance), the load test shall be as full as possible。
Iii. Methodology of the facts of the efficients
1. Damage to flow management module
It is usually caused by grid voltage or internal short circuits. The bridge is replaced by an internal short circuit. In case of on-site failure, check users ' grids, such as grid voltage, and whether there are equipment such as welders that contaminates the grid。
2. The reverse module is damaged。
It is usually caused by electrical or cable damage and power circuit failure. Repair of the drive circuit, test of the wave shape and replacement of the module. Following the replacement of the drive panels, attention is paid to checking the power and connection cables. The reverse agent can be operated after confirmation of non-facility。
3. No display on
Usually the switch power was damaged or the soft charging circuit was damaged, leaving the dc circuit without dc power. For example, electrical resistance damage, damage to operating panels, etc。
4. Display pressure or stress
It is usually caused by input gaps, aging circuits and damp circuit boards. The solution would be to identify electro-voltage detection circuits and detection points and replace damaged equipment。
5. Show passages or short-circuits
Usually due to current detection of circuit damage. For example, hall component... Discharge circuit, etc。
6. Power and drive boards start showing overflows
It is usually caused by damage to the driving circuit or the reverse module。
Space-borne output voltage is normal and overload or overflow is shown after loading
Often due to inadequate parameter setting, ageing of driving circuits, and module damage。
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