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Inverter common trouble maintenance example
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Inverter common trouble maintenance exampleToday is Sunday, at 4 o'clock in the morning I received a telephone, said with a lift with the Yaskawa 616G5-22KW inverter fault, "UV" display, immediately asked to help repair, because the elevator is urgently! Find a lot of companies can not find people, and finally to find us here! We also anxious customer anxious, immediately for maintenance, found that only the charge resistance! Immediately repaired, so if the maintenance of the elevator, the principle of the frequency converter, the problem can be solved completely. Customers also appreciate the attitude of our service, but this is our commitment to customers forever!
Electrolytic capacitors are relatively easy to aging of components, a feature of aging is capacity low uplift, if your side without capacitance meter measurements, you can use comparative method for measuring, another take a same capacity (pressure may be different capacitance to compare, million with a pointer table resistance profile measuring capacitance resistance, universal table pointer swing angle, the larger capacity of the angle bigger! The second time measurement to discharge the capacitor (two feet short circuit)!
On the use of PC929 as the driving characteristics of optocoupler circuit: because this circuit with feedback loop is detected, respectively from the output (Eu, Ev, Ew three) compared to retrieve the signal and the driving signal, when the detected output of the inverter is not normal, through an optocoupler emits a high level signal to the motherboard, the inverter immediately cut off the driving signal and display the "flow" or "short circuit fault, the protection of IGBT" quite fast, the inverter circuit is not too easy to burn the module, but the problem is when the inverter driving element of unstable performance, such as small capacitance, optocoupler aging, switching power supply has little effect when working normally and drive, inverter always false alarm (SC), the fault is not obvious, sometimes to check most of the day to find out the reasons, to ensure the quality of the driving circuit of small components must be so PC929 as the driver, not the inverter used for a period of time will appear this problem! I've seen a few signs of the inverter is this!
Many people call, when it comes to Yaskawa 616G5 616P5 above -22KW power inverter sometimes jump "oh1" fault, inverter can not run, according to the instructions to check the temperature of the fan and inverter, current is normal, make clear what is the reason! In fact, is located in the inverter inside (module) of a three line (with the detection line) fan is bad, and sometimes the fan can run but dust will also make the frequency converter show that this fault! As the inverter radiator fan is normal, the general people do not know the inverter inside and this fan! Cause a lot of people are confused! So please Yaskawa should be inside the instructions tell it better, inform customers encounter this problem should first check the frequency converter (rather than the outside, see the fan!
Many people in the calculation of the inverter (energy saving) of the payback period, not the frequency converter service life and maintenance costs are well considered! Different brand frequency converter service life is very different, some use 5-6 years after the first repair, some just over the warranty period began to frequent maintenance! Some poor performance of the converter is almost no maintenance value! The inverter fault is generally module burned, and this module is usually not low price! The maintenance fee will surprise you! So in the purchase of the brand and the maintenance of the inverter is to focus on the issue of consideration
Panasonic DV-707 inverter switching power supply did not install the insurance tube, a when the switch short-circuit damage, and often the switch power transformer primary coil is burnt out, the transformer is not easy to find, and high price. In order to protect the transformer, our approach is on the circuit board cut off switch tube and the primary coil circuit, in the notch welding an insurance tube (1a) or a (0.6-1) Omega /0.25W resistance, so if the switch tube circuit, the transformer is safe!
Maintenance of inverter circuit board, due to disassembly component, the original circuit board insulating paint damage, a lot of people to fix the inverter no on the circuit board then spray insulation paint, results when the circuit board damp or dust, its easy and failure! Especially the switching power supply and other electrical parts! No insulating paint can also be soluble in alcohol rosin brush to the circuit board, use a hair dryer!
Recently, a lot of frequency converter is lightning, damage! Most of the main board is also broken down, will be the frequency of the frequency converter is not connected to the majority of the! The importance of the ground wire is known when the boss sees the price of the offer! Check ground ground is good is also very simple, with the lighting of a 100W/220V received phase and ground try, see the brightness knew it!
Maintenance just a lift with the Yaskawa 616G5-22KW inverter, due to the radiating fan short-circuit and burn the 380 / 220 transformer, the transformer is not only hard to find and entire machine apart to change (installed in the bottom and remove down very troublesome), inverter is also more urgent need! Since the transformer is only supplied to the fan for 220V voltage, we simply put the transformer off, directly from the outside for the 220V voltage to the fan, which is also an emergency approach!
Some converter and anti interference ability is poor, after running for a period of time often appear false alarm action (such as overcurrent, overload, overvoltage), others won't start or stopping for no reason. This is due to a communication program error! Then the parameter values to restore the factory, "the parameters restore factory default seems to be" the best ""! Maintenance frequency converter used frequently! Interference can sometimes cause the frequency converter to display communication failures, parameters are
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