Fenggang Senlan frequency converter maintenance hotline

Fenggang Senlan 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!

Fenggang Senlan frequency converter maintenance hotline

SenlanTypical Fault Case Analysis and Maintenance Methods of Frequency Converter

1、 Overcurrent fault (OC)

1. ‌Case Analysis‌

• ‌Acceleration Process Overcurrent (OCA)After the SB70 frequency converter was started, the frequency could not exceed 3Hz, and the motor stopped with abnormal noise. It was found that the aging of the drive circuit capacitor caused insufficient pulse current2.

• ‌Over current during deceleration process (OCD)Frequent reporting of OCD when the load inertia is high, extending the deceleration time or adding a braking resistor to restore normal operation9.

• ‌Constant speed overcurrent (OCN)Sudden overcurrent during operation, investigation found that the motor winding short circuit caused a sudden change in current12.

2. ‌Repair Method‌

• Check if the load exceeds the limit or if there is mechanical blockage, adjust the acceleration/deceleration time9.

• Replace aging capacitors, IGBT modules, or repair drive circuits27.

• Calibrate the signal circuit of the current transformer to ensure detection accuracy2.

2、 Overvoltage/undervoltage fault (OU/UL)

1. ‌Case Analysis‌

• ‌Standby Overvoltage (OUE)During shutdown, the voltage fluctuation of the power grid caused the DC bus voltage to exceed the limit, and a voltage regulator device was installed to solve the problem9.

• ‌Operating under voltage (DCL)Three phase input phase loss caused power supply abnormality, and the fault was eliminated after repairing the power supply circuit8.

2. ‌Repair Method‌

• Check the stability of the input power supply and the phase loss protection function812.

• Optimize energy consumption braking parameters or external braking units9.

3、 No display fault

1. ‌Case Analysis‌

• The panel connection wire is broken or the motherboard power supply is abnormal, causing a black screen. After re soldering the circuit or replacing the power module, the display will be restored4.

2. ‌Repair Method‌

• Prioritize checking the power wiring and fuse status5.

• Detect motherboard capacitors, resistors, and other components, and upgrade firmware if necessary4.

4、 Overheating/overload fault

1. ‌Case Analysis‌

• ‌Heat dissipation malfunctionThe frequency converter reported overheating (OLI), and it was detected that the cooling fan stopped running. After replacing the fan, it ran normally1.

• ‌Overloaded loadFrequent tripping of frequency converter (OLP), adjust load distribution or replace high-power models to solve the problem1112.

2. ‌Repair Method‌

• Clean the cooling channel and test the operation status of the fan15.

• Check motor bearing wear or mechanical transmission system resistance11.

5、 Handling of special fault codes

• ‌ERFOF (Power Device Protection)IGBT module breakdown or abnormal driving signal, module replacement and repair of driving circuit are required112.

• ‌CCF (current detection fault)The Hall sensor is damaged or the signal line has poor contact. Replace the sensor and reinforce the wiring12.

General maintenance process

1. ‌Preliminary diagnosisObserve fault codes, abnormal sounds, and heat dissipation status711.

2. ‌Hardware Detection‌：

• Use a multimeter to test rectifier/inverter modules, capacitors, resistors, and other components27.

• Low voltage power supply test drive circuit output pulse2.

3. ‌parameter calibrationRestore factory settings or adjust parameters such as V/F curve and torque boost according to the manual89.

4. ‌full loadingAfter repair, a 48 hour continuous load test is required to ensure stability11.

Precautions

• Static protection: Wear an anti-static wristband during disassembly to avoid damaging precision components4.

• Spare parts selection: Prioritize the use of original factory accessories to ensure compatibility7.

• Environmental requirements: Keep the working temperature between -10 ℃ and 40 ℃, and the humidity below 90%

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