Dalingshan Weichuang frequency converter maintenance hotline

Dalingshan Weichuang 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!

Dalingshan Weichuang frequency converter maintenance hotline

Common Fault Case Analysis and Maintenance Methods of Weichuang Inverter

1、 Overcurrent fault (OC)‌

‌Case phenomenon‌：

• ‌Acceleration/deceleration mid report OCFrequent tripping during startup or shutdown, accompanied by explosion sound (AC60-T3 series high incidence)13；

• ‌Constant speed OC reported during operationSudden load change leads to a sudden increase in current, causing the frequency converter to shut down for protection17.

‌root cause‌：

1. ‌Abnormal loadMotor winding short circuit (phase to phase/ground), mechanical jamming, or excessive inertial load17；

2. ‌Parameter setting error: Short acceleration/deceleration time, high torque boost value7；

3. ‌hardware failure‌：

• IGBT module breakdown (caused by poor heat dissipation)13；

• Driver optocoupler damage leads to output short circuit4.

‌Maintenance steps‌：

1. Disconnect the load test. If OC still reports, check the inverter module and drive circuit1；

2. Measure the static voltage of the driver IC (normal value: upper bridge+10~15V, lower bridge -5~-10V), replace the abnormal optocoupler or voltage regulator tube4；

3. Adjust parameters: Extend acceleration and deceleration time (AC60 series: parameters E-01/E-02), reduce torque compensation value (parameter E-09)7.

‌2、 Frequency anomaly fault‌

‌Case phenomenon‌：

• ‌Frequency cannot be increasedSet high frequency but actual output ≤ 20Hz (parameter F17 gain mistakenly set to 200%)8；

• ‌Frequency fluctuationFrequency instability during load changes4.

‌Key areas for investigation‌：

1. ‌Parameter Settings‌：

• The frequency gain parameter (F17) needs to be calibrated according to the motor characteristics (factory value of 100%)8；

• Mismatch in V/F curve setting (linear type should be selected for constant torque load)7；

2. ‌hardware issue‌：

• Current detection circuit fault (Hall sensor offset)4；

• Input phase loss causes insufficient DC bus voltage (low frequency can operate, high speed reports undervoltage)10.

‌solution‌：

• Restore factory parameters (AC60: press and hold the 'STOP' key for 5 seconds), reset the F17 value8；

• Check the phase sequence of the input power supply and the contact status of the air switch10.

‌3、 Module burst (IGBT damaged)‌

‌Typical Case‌：

• ‌Bombing machines on rainy daysThe humid environment leads to carbonization of the circuit board, and the driving signal mistakenly triggers a short circuit13；

• ‌Explosion after repeated overpressureBrake resistor failure, unable to release regenerative energy and breakdown module (high incidence for models above 75kW)13.

‌Prevention and Maintenance‌：

1. ‌Environmental protectionInstall moisture-proof cover plates and regularly clean dust (especially for textile factories)13；

2. ‌Brake system maintenance‌：

• Large inertia loads require an external braking unit (such as a fan/hoist)13；

• Check the resistance value of the braking resistor (if the deviation is greater than 10%, it needs to be replaced)6；

3. ‌Safe replacement process‌：

• Clean the carbonized PCB and perform a low-voltage test to ensure the balance of the driving waveform before replacing the module4；

• Connect a 40W light bulb in series for current limiting, conduct a power on test for no short circuit, and then operate at full voltage4.

‌4、 Overheating fault (oH)‌

‌trigger conditionInternal temperature>85 ℃59.
‌root cause‌：

• Cooling fan stops running (dust clogging bearings)9；

• Dust accumulation on heat sink (aluminum gap blockage rate>50%)5.
  ‌Treatment measures‌：

• Clean the air duct and replace it with a fan of the same specification (AC60: DC24V 0.2A)7；

• Installation spacing ≥ 10cm, install ventilation fan on the cabinet13.

‌5、 Quick search for fault codes and emergency response‌

‌Maintenance safety regulations‌

1. ‌Capacitor maintenanceLong term idle equipment requires step charging to activate electrolytic capacitors (pre charged with 24V DC first)5；

2. ‌Drive TestAfter replacing the module, it is necessary to verify the balance of the three-phase waveform with low voltage (24V DC)4；

3. ‌Anti explosion machine designPrioritize using models with output short-circuit protection (such as AC70 series)

4.