Inverter Troubleshooting Examples - Inverter, Practical Skills - Hc Net Electrical Industry

This article describes the various common inverter fault with examples.

(1) AEG Multiverter122/150-400 converter at startup DC Circuit Pressure Trip

The inverters will not always start over-voltage trip. Inspection found that the power converter in the signal but not closing the DC circuit voltage that is up to 360V, the inverter circuit of the positive series with a DC contactor units, in a closing signal through the process of pre-charge after the pull Therefore, pre-charge circuit IGBT suspected poor performance, off pre-charge circuit IGBT, the situation remains. Use Multimeter Check the inverter output to ground when the resistance is very small, check to electrical junction box found at the scene to get wet and dry treatment, frequency converter working properly.

As electrical junction boxes to get wet, the DC Circuit on the ground leakage current flowing through the anode junction box and inverter inverter freewheeling diodes to the DC circuit of capacitor charging, this closing is usually understood to be too actual flow for the over-voltage trip trip. I think that the start frequency inverter output voltage and gradually increase the motor to get wet, it will cause a high rate of change of output current, causing DC Circuit pressure.

(2) control roller motor AEGMaxiverter-170/380 inverter occurring at a rate greater than the speed feedback value set by the observed values:

A) does not exist in the rolling process of the case, when the steel roller to leave before this happens;

B) When the speed feedback value is greater than the speed setting value, the DC circuit voltage of 125% of rated voltage, more than 115% of the limit set value;

C) the incoming line voltage inverter over limit;

In the rolling process, the operation of the control roller motor to rise speed, when the steel after leaving roller Roller motor speed down to the original speed, because it did not install the inverter and brake, deceleration limited by voltage regulator to maintain the DC braking current circuit voltage does not exceed 115% of the limit set value (default value), due to the incoming line voltage is too high, the DC circuit voltage exceeds the set limit, the deceleration voltage regulator work, resulting in a very small braking current, motor speed does not drop down, and in rolling, the network load increased, the DC circuit voltage of less than 115% of the limit set value, the brake function returned to normal. Was not reduced in the case of grid voltage, the DC circuit voltage limit set value to 127%, the converter is working properly. In the shutdowns, our situation has changed according to the grid Transformer Stalls, so that the incoming line voltage inverter to the extent permitted, then converter is working properly.

(3) AEG Multiverter22/27-400 power converter, the operation Panel On Liquid crystal The display shows the normal, but the ready light does not shine, inverter can not switch on

View menu inverter fault record was not found defective, but the buttons on the control panel on the operation in the event log is recorded. Check the frequency converter A10 Motherboard , A22 power supply board LED Indicators are normal, with Shi Dianbi into line power measurement transducer and found a similar display is not normal, use multimeter to measure three-phase results: Vab = 390V, Vac = 190V, Vbc = 190V. The inspection system into line terminal block office poor contact.

Ready indicator is the frequency converter a comprehensive reflection of various state information, when it does not shine when prompted maintenance personnel in the converter is not ready. At this point in the incoming line power inverter fault is not normal, the record does not reflect the reasons are not ready, may be related to circuit design.

(4) the process of debugging Siemens MIDIMASTER Vector (22kW) Inverter over-current trip started after

Inverter supplier and equipment supplier accused of communication because of the reason, the capacity does not match (motor power 30kW). The inverter control mode selected vector control, the input motor parameters, the inverter automatically limit motor rated current 60A in 45A, without power factor motor nameplate on the size, according to the requirements of inverter manual, set it 0, making automatic recognition (P088 = 1) when the start motor, inverter over-current trip. Taking into account matching reasons, the control mode to V / F control, the situation remains. After checking the motor parameters, we found that the power factor of 1.1, to read as 0.85, the converter is working properly.

Not match due to capacity, frequency converter based on input parameters to calculate the motor will produce incorrect results, in the face of this situation and not solve the matching problem for the time being, be sure to check in there after automatic identification of unsuitable parameters.

(5) Siemens 6SE70 Series Inverter PMU panel LCD screen to display the letter "E"

This happens, the drive does not work, press the P key and re-suspended transmission were invalid, nor the related investigation manual introduction checking external DC24V power supply and found that the lower voltage, are resolved, the frequency device is working properly.

Converter manual fault countermeasures on the table are all described in the more common faults, in the event of some of the code not covered by a comprehensive examination when the transducer response.

(6) Siemens MM420/MM440 Converter AOP panel can only store a set of parameters Converter Selection Guide

described AOP panel that can store 10 groups of parameters, but with the AOP panel at the second inverter parameters for backup, was "insufficient storage capacity." Solution as follows:

A) in the menu, select "Language" item;

B) In the "Language" item in the select a language not in use;

C) Press Fn + button to select Delete, and press the P key when prompted to confirm;

This, AOP panel can store 10 groups of parameters. This phenomenon could be due to the design AOP panel Memory Not enough.

(7) ABB ACS600 frequency converter in the run-time DC Circuit Pressure Trip

The inverter is equipped with brake chopper and braking resistor, but the foreign staff in debugging when debugging options for the ON voltage controller without using the brake chopper and brake resistor. Pressure in the DC Circuit after tripping into chopper and braking resistor, the result is more frequent trips. Converter manual pressure on the DC Circuit's interpretation of the reasons usually have 2 points:

A) the incoming line voltage is too high;

B) deceleration time is too short;

Because the converter has been put into operation 2 months, and the trip into the line voltage when the allowable range, the other converter is working properly, combined with Pre-treatment Inverter failure of the DC Circuit's understanding of pressure, that in making Electricity Voltage

by: gaga

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