Hengli Delta frequency converter maintenance hotline

Hengli Delta frequency converter maintenance hotline

Dongguan Changping Juyou ElectromechanicalEquipment Maintenance Department specializes in repairing Mitsubishi servo drives, Panasonic servo drives, Yaskawa servo drives, Dongrong servo drives, Sanyo servo drives, Fuji servo drives, Delta servo drives, Omron servo drives, Fanuc servo drives, etc; MitsubishiPLCPanasonicPLCSiemensPLCOmronPLCWait; Various touch screens, frequency converters, industrial circuit boards, etc.

Provide on-site service near the company,Bringing you convenience. We have the advantages of short maintenance cycle, high repair rate, reasonable price, and no need for circuit diagrams, We have also repaired different types of circuit boards for multiple companies. Customers from outside the province can send the servo to be repaired to our company, and we will conduct testing on the day of receiving the goods and arrange for repairs as soon as possible. If the customer's machine is severely damaged and cannot be repaired, our company will not charge any fees. Welcome to consult and cooperate!

Hengli Delta frequency converter maintenance hotline

Analysis and Maintenance Methods of Common Malfunctions in VFD-B Delta Inverter

1、 Overcurrent fault (OCC)

1. ‌Case Analysis‌

• ‌Acceleration process overcurrentOCC fault reported during startup, due to the acceleration time parameter (such as 2202) being set to 2 seconds too short, the current suddenly changed and disappeared after 10 seconds, and the operation was stable1214.

• ‌Motor winding short circuitSudden overcurrent during operation, measurement of motor three-phase resistance imbalance, confirmation of winding turn to turn short circuit causing abnormal current514.

• ‌IGBT breakdownThe explosion machine malfunction was accompanied by a burnt smell. Upon disassembly and inspection, it was found that the CE pole resistance of the IGBT module was 0 Ω. After replacing the module and repairing the drive circuit, it was restored57.

2. ‌Repair Method‌

• Check if the mechanical load is stuck (such as belts, bearings), and manually rotate the disc to confirm smoothness14；

• Adjust the acceleration/deceleration time to a reasonable range (recommended ≥ 5 seconds)1214；

• Replace the damaged IGBT module and perform synchronous maintenance on the drive circuit optocoupler (such as A3120) and gate resistance57.

2、 Overvoltage/undervoltage fault (OV/LU)

1. ‌Case Analysis‌

• ‌Shutdown overvoltage (OV)Failure to configure braking resistor resulted in abnormal energy feedback. After installing a 200 Ω/5kW braking unit, the DC bus voltage stabilized912.

• ‌Input phase loss (LU)The oxidation of the power contactor contacts caused a phase loss. After cleaning the contacts and reinforcing the wiring, the undervoltage alarm was eliminated14.

• ‌Capacitor agingThe DC bus capacitor bulged and leaked, and the voltage returned to normal after replacing the capacitor of the same specification (discharging to below 30V)56.

2. ‌Repair Method‌

• Detect the balance of three-phase power supply (deviation ≤ 2%), install input reactors to suppress grid fluctuations1214；

• Calibrate the voltage detection circuit, focusing on investigating the deviation of the voltage divider resistor resistance (such as DR40/DR41)812.

3、 No display and switch power failure

1. ‌Case Analysis‌

• ‌Voltage stabilization failurePower on black screen, detect damage to switch power supply KA431 chip, replace and restore+5V output8.

• ‌Capacitor explosionThe explosion of the main circuit filtering capacitor caused the power module to burn out. After cleaning the oil stains and replacing the capacitor, it started normally68.

2. ‌Repair Method‌

• Measure the key point voltage of the switch power supply (± 12V, 5V), replace the damaged TL494 chip or voltage regulator diode813；

• Check the on/off status of the fuse tube (such as FUSE 10A) and identify potential short-circuit hazards in the rectifier bridge814.

4、 Overheating fault (oH)

1. ‌Case Analysis‌

• ‌Fan stops runningThe dust accumulation and blockage of the cooling fan caused the IGBT temperature to exceed the limit. After cleaning, the test speed was ≥ 2000rpm912.

• ‌high ambient temperatureWorkshop temperature reaches 50 ℃, triggering overheating protection, installing ventilation equipment to cool down to below 40 ℃1112.

2. ‌Repair Method‌

• Clean the dust on the heat sink every month and test the fan start stop function (parameter 04-02 setting)912；

• Optimize the low-frequency torque compensation of the V/F curve (parameter 07-02) to reduce motor temperature rise1214.

5、 Handling of special fault codes

Maintenance standard process

1. ‌Preliminary diagnosis‌：

• Record fault codes and environmental parameters (temperature/load)1214；

• Observe abnormal phenomena (peculiar smell, abnormal noise)57.

2. ‌Hardware maintenance‌：

• Disassemble and inspect the static resistance of the main circuit (rectifier bridge, IGBT, capacitor) and drive circuit57；

• Oscilloscope verification of driving pulse waveform (dead time 3-5 μ s)714.

3. ‌parameter calibration‌：

• Reset the motor nameplate data after restoring the factory settings (parameter 99.02)1214.

4. ‌Load verification‌：

• Run without load for 30 minutes, gradually load to rated power to test stability1214.