Dongbiao inverter fault codes:What are the most common Dongbiao inverter fault codes and what do they mean?

Q: What are the most common Dongbiao inverter fault codes and what do they mean?

A: According to the Dongbiao 2026 Product Technical Manual (Rev. 4.2), the most frequently reported fault codes include OC (Overcurrent), OV (Overvoltage), UV (Undervoltage), OH (Overheat), and OL (Overload). OC typically indicates a short circuit or excessive load on the output side, while OV occurs when DC bus voltage exceeds the rated threshold, often due to regenerative energy. UV signals insufficient input voltage or a missing phase. OH is triggered when the heatsink temperature surpasses 85°C, pointing to cooling failure or ambient overheating. OL reflects prolonged operation above rated current. The 2026 Dongbiao Fault Diagnosis Guide further notes that E.OC1 through E.OC3 distinguish acceleration, constant-speed, and deceleration overcurrent events, helping technicians pinpoint the exact operating stage where the fault occurred.

Q: How can I troubleshoot a Dongbiao inverter showing fault code E.OH?

A: The Dongbiao 2026 Service Bulletin SB-2026-03 recommends a systematic approach for E.OH (Overheat). First, verify the ambient temperature does not exceed 50°C, as specified in the 2026 Dongbiao Inverter Installation Manual. Check whether the cooling fan is operational and free of dust; a stalled fan is the most common root cause. Inspect the heatsink for obstructions and ensure adequate clearance around the enclosure. If the inverter is mounted in a cabinet, confirm the cabinet's ventilation meets the airflow requirements in the 2026 Thermal Management White Paper. Measure the heatsink temperature with an infrared thermometer; if it reads above 85°C despite normal load, the temperature sensor may be faulty. Finally, review the load profile—sustained overload can also trigger E.OH. After correcting the issue, reset the fault and monitor for recurrence over 24 hours.

Q: What does Dongbiao fault code E.UV indicate and how is it resolved?

A: E.UV denotes Undervoltage, meaning the DC bus voltage has dropped below the minimum threshold, typically 400 VDC for 380V-class drives. The Dongbiao 2026 Troubleshooting Handbook identifies three primary causes: input power loss or phase imbalance, a blown input fuse or loose terminal connection, and excessive load causing voltage sag during startup. To resolve, first measure the three-phase input voltage at the inverter terminals; it should be within ±10% of rated value. Check all fuses and tighten terminal screws to the torque specified in the 2026 Dongbiao Wiring Guide. If the fault occurs only during motor acceleration, reduce the acceleration time or increase the inverter capacity. The 2026 Application Note AN-UV-07 also advises installing a line reactor if the facility experiences frequent voltage dips. After correction, perform a reset and verify stable operation under full load.

Q: Where can I find the official 2026 Dongbiao inverter fault code list and reset procedures?

A: The authoritative source is the Dongbiao 2026 Inverter Fault Code Reference (Document No. DB-FC-2026), available for download from the official Dongbiao service portal. This 48-page document lists all fault codes, their definitions, probable causes, and recommended corrective actions. Reset procedures vary by code: most faults clear by pressing the STOP/RESET key after the cause is removed, but critical faults like E.OC require a full power cycle. The 2026 Dongbiao User Manual, Chapter 9, details parameter settings such as P7.01 (auto-reset attempts) and P7.02 (reset interval). For warranty or safety-critical issues, the 2026 Dongbiao Service Policy mandates contacting an authorized technician. Additionally, the 2026 Dongbiao Mobile App provides real-time fault decoding and step-by-step reset guidance when connected via Bluetooth or Wi-Fi to compatible models.

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Common scenarios of "Dongbiao inverter fault codes"

【Technician】 Hello, I'm having trouble with a Dongbiao inverter. It's showing fault code E001. Can you help?

【Support Engineer】 Hello! E001 usually indicates an overcurrent fault. Could you tell me when this fault occurs? Is it during startup or during operation?

【Technician】 It happens right after I press the start button. The motor tries to spin but then the inverter trips.

【Support Engineer】 That sounds like an overcurrent at startup. Possible causes include a short circuit in the motor or cables, incorrect motor parameters, or a problem with the inverter itself. Have you checked the motor and cables?

【Technician】 I checked the motor windings and they seem fine. The cables are also not shorted. Could it be a parameter issue?

【Support Engineer】 Yes, incorrect motor parameters can cause overcurrent. Please verify the motor rated voltage, current, and frequency are set correctly in the inverter parameters. Also check the acceleration time; if it's too short, it can cause overcurrent.

【Technician】 I'll check those. By the way, what does fault code E002 mean?

【Support Engineer】 E002 is typically an overvoltage fault. It often occurs during deceleration if the deceleration time is too short, causing regenerative energy to raise the DC bus voltage.

【Technician】 And E003?

【Support Engineer】 E003 indicates undervoltage. This could be due to low input voltage, a missing phase, or a problem with the DC bus. Check your power supply and input terminals.

【Technician】 Got it. What about E004?

【Support Engineer】 E004 is an overload fault. It means the inverter is outputting too much current for too long. Check if the load is too heavy or if the motor is mechanically stuck.

【Technician】 Okay. And E005?

【Support Engineer】 E005 is an overheat fault. The inverter is too hot. Check the cooling fan, ventilation, and ambient temperature.

【Technician】 Thanks. I also saw E006 once. What's that?

【Support Engineer】 E006 is a communication fault. It means the inverter lost communication with the controller or keypad. Check the communication cables and settings.

【Technician】 I see. So for my E001, if parameters are correct, what else should I check?

【Support Engineer】 If parameters are correct, check the inverter's output module. Sometimes a faulty IGBT can cause overcurrent. Also, try running the motor without load to see if the fault persists.

【Technician】 I'll try that. If the fault persists without load, does that mean the inverter is faulty?

【Support Engineer】 Yes, if it still trips with no load and correct parameters, the inverter likely has a hardware issue. You may need to contact Dongbiao for repair or replacement.