Liaobu Yingweiteng frequency converter maintenance hotline

Liaobu Yingweiteng 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!

Liaobu Yingweiteng frequency converter maintenance hotline

Analysis and Maintenance Methods of Common Malfunctions in Envision Inverter

1、 Inverter unit fault (OUT1/OUT2/OUT3)

‌Case performance‌：

• The frequency converter reports codes "OUT1", "OUT2", and "OUT3", which correspond to abnormal U/V/W phases of the inverter unit, commonly seen in models that use PC929 to drive optocouplers89.
  ‌Cause investigation‌：

1. ‌Hardware damageIGBT module short circuit, abnormal driving circuit (such as gate resistance variation, unstable optocoupler power supply)8；

2. ‌Poor heat dissipationFan malfunction or high ambient temperature causing overheating of the inverter module7.
   ‌Repair Method‌：

• Static testing of IGBT module diode characteristics, replacement of damaged driver optocouplers or gate resistors;

• Check the cooling system, clean the fan or replace the same type of cooling component810.

2、 Overcurrent fault (OC1/OC2/OC3)

‌Case performance‌：

• When accelerating/decelerating/running at a constant speed, report "OC1", "OC2", "OC3", which may be accompanied by motor stalling or sudden load changes58.
  ‌Reasons and Handling‌：

1. ‌Load issueMotor cable short circuit, mechanical jamming, or load exceeding rated value;

2. ‌Parameter Settings: Short acceleration time, unreasonable V/F curve, or lack of self-learning in vector control59；

3. ‌interfering factorZero ground sharing causes false alarm of OCU1 fault (requires independent grounding)10.
   ‌Maintenance steps‌：

• Disconnect the motor for no-load trial operation and troubleshoot mechanical side issues;

• Extend acceleration and deceleration time, perform motor parameter self-learning;

• Lay the ground wire separately to avoid zero ground interference510.

3、 No display fault on the panel

‌Case analysis and handling‌：

1. ‌Power issueDC bus voltage missing or rectifier module damaged (detect P/N terminal voltage)47；

2. ‌Connection exception: Loose display board wiring or broken film button circuit (requires re plugging or short circuiting of contacts)4；

3. ‌Software crash: Resolve by initializing parameters or upgrading firmware (original data needs to be backed up)49.

4、 Overvoltage fault (OU1/OU2/OU3)

‌typical scenario‌：

• Braking energy feedback during deceleration leads to excessive bus voltage or abnormal fluctuations in input power supply voltage811.
  ‌solution‌：

1. ‌Hardware optimizationCheck the resistance value of the braking resistor and the status of the braking unit, and replace the aging capacitor11；

2. ‌parameter adjustmentExtend deceleration time and activate energy consumption braking function8；

3. ‌environmental improvementClean the dust in the heat dissipation channel and reduce the operating temperature711.

5、 Bus undervoltage fault (UV)

‌cause of failure‌：

• Input power phase loss or voltage below rated value (e.g. 380V input voltage<300V)89；

• Damage to rectifier bridge or failure of detection circuit (compare panel display value with actual bus voltage)9.
  ‌Maintenance Recommendations‌：

• Check the contact points of circuit breakers and power supply lines, and replace damaged rectifier modules;

• Calibration of voltage divider resistor parameters in voltage detection circuit810.

6、 Cooling system malfunction

‌Frequently Asked Questions‌：

• Fan shutdown causes overheating alarm, or dust accumulation affects heat dissipation efficiency7.
  ‌solution‌：

1. Check the 24V fan power supply circuit (such as whether the driving transistor Q81 is damaged);

2. Regularly clean the air duct and replace the expired cooling fan710.

Maintenance precautions

• ‌parameter recordBackup key parameters before maintenance (such as motor nameplate data, V/F curve settings)59；

• ‌safe operationAfter power failure, delay for 10 minutes before touching the busbar capacitor to avoid residual voltage electric shock710；

• ‌Interference protectionMotor cables and control lines are laid separately and grounded using shielded wires

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