When a Hope65 Series Smart AC Drive / VFD shows a fault code, record the exact code first. Do not repeatedly press reset. The fault code indicates the protection type, but the root cause must be confirmed from wiring, motor condition, load condition, input voltage, acceleration/deceleration time, braking system, motor parameters, terminal signals, and communication settings.
For overcurrent faults, check motor/load blockage, output short circuit, motor cable insulation, acceleration/deceleration time, torque boost, V/F curve, motor tuning, and drive capacity. For overvoltage faults, check input voltage, regenerative load, deceleration time, braking resistor, and external force driving the motor.
Reset the fault only after the cause has been corrected. The fault can be reset using the keypad STOP/RST key, a configured digital input, or power cycling, but operation should restart only after safe troubleshooting is complete.
Only trained and qualified electrical personnel should inspect the drive, wiring, motor cable, motor terminal box, braking resistor, control terminals, or panel components.
Before touching wiring or terminals, switch off all input power, wait at least 10 minutes, and confirm that the DC bus voltage has discharged to a safe level. Do not change wiring while power is ON.
This article helps diagnose Hope65 Series Smart AC Drive / VFD fault codes. It explains the practical meaning of each fault group, likely root causes, first checks, corrective actions, reset rules, and information to collect before contacting support.
A fault code should be treated as a protection signal, not as an automatic confirmation that the VFD is defective. Most faults are caused by external wiring, wrong motor parameters, load issues, unstable supply voltage, braking design, incorrect acceleration/deceleration time, analog/terminal/communication command problems, or installation environment.
01 RecordWrite down the exact fault code, operating stage, speed, load condition, and whether it occurs during start, run, deceleration, or stop. | 02 DiagnoseCheck voltage, current, motor cable, motor/load condition, parameters, braking system, and fault history data. | 03 Correct & ResetCorrect the fault cause first. Then reset using STOP/RST, digital input reset, or power cycling if safe. |
| Product Series | Slanvert Hope65 Series Smart AC Drive / VFD |
| Common Symptoms | Drive displays E-code or A-code, motor stops unexpectedly, fault repeats after reset, drive trips during acceleration, drive trips during deceleration, drive trips at constant speed, motor overload, voltage fault, phase loss, communication abnormal, or motor tuning fault. |
| User Level | Qualified electrical technician, maintenance engineer, panel builder, machine integrator, or automation engineer. |
Use this workflow before replacing the VFD, motor, braking resistor, or control components.
01 Read Code
| → | 02 Check History
| → | 03 Check Root Cause
|
04 Correct
| → | 05 Reset & Test
| Fault Rule: Reset is the final step, not the first step. Always identify why the fault occurred before restarting the machine. | |
After troubleshooting and correcting the cause, the Hope65 fault can be reset using one of the supported reset methods.
| Reset Method | When to Use | Important Warning |
|---|---|---|
| STOP/RST key | Normal local reset after cause is corrected. | Do not press repeatedly if the same fault immediately returns. |
| Digital input reset | Panel/PLC reset where DI is configured for fault reset. | Make sure automatic restart is safe for the machine and operator. |
| Power cycle | Use only when safe and after the cause is known. | Wait for safe discharge before touching terminals or wiring. |
The F8 fault record parameters help identify what happened when the fault occurred. This is important when the fault does not remain on the screen or happens only during operation.
| Parameter | Meaning | Why It Helps |
|---|---|---|
| F8-13 | Type of first fault | Shows earliest recorded fault type in the fault history group. |
| F8-14 | Type of second fault | Helps compare repeated or changing fault types. |
| F8-15 | Type of third/latest fault | Most useful for current fault diagnosis. |
| F8-16 to F8-23 | Latest fault operation data | Shows frequency, current, bus voltage, input status, output status, VFD status, power-on time, and running time during latest fault. |
| F8-24 to F8-31 | Second fault operation data | Useful for intermittent faults and comparison with latest fault. |
| F8-32 to F8-39 | First fault operation data | Useful when the fault history needs full sequence review. |
| Fault Group | Codes | First Diagnosis Direction |
|---|---|---|
| Current-related faults | E01, E02, E03, E04, E18, E22 | Check motor/load jam, output short circuit, ground fault, motor cable insulation, acceleration/deceleration time, torque boost, V/F curve, motor tuning, and drive capacity. |
| Voltage-related faults | E05, E06, E07, E08, E09 | Check input voltage, DC bus voltage, regenerative energy, deceleration time, braking resistor, and supply stability. |
| Load and motor protection faults | E10, E11, E27, E29 | Check load size, mechanical condition, motor rated current, overload protection setting, offload detection, and motor/load connection. |
| Wiring and phase faults | E12, E13, E22 | Check input phase, output phase, U/V/W wiring, motor cable, motor terminal box, grounding, and insulation. |
| Control and external signal faults | E15, E16, E24, E25, E28 | Check external fault DI, user-defined fault DI, RS485 communication, PID feedback, PLC/HMI commands, and control wiring. |
| Internal or service faults | E14, E17, E20, E21, E23, E26, E42 | Check cooling, temperature, internal board issues, accumulated operation/power-on time, and technical support requirements. |
Use this table for first diagnosis. Corrective action should be performed only by qualified personnel.
| Code | Fault Type | Likely Causes | Corrective Actions |
|---|---|---|---|
| E01 | Wave-by-wave current limiting fault | Load too large, motor rotation blocked, VFD capacity insufficient. | Reduce load, check motor/mechanical condition, verify drive capacity. |
| E02 | Overcurrent during acceleration | Output short/ground fault, motor tuning issue, acceleration too short, wrong torque boost/V/F curve, low voltage, restarting spinning motor, sudden load increase, undersized VFD. | Check output circuit, tune motor parameters, increase acceleration time, correct V/F or torque boost, correct voltage, wait for motor stop or use speed tracking, reduce load, verify VFD sizing. |
| E03 | Overcurrent during deceleration | Output short/ground fault, motor tuning issue, deceleration too short, sudden load change, no braking resistor, insufficient VFD capacity, overexcitation gain too high, low grid voltage. | Check motor/output circuit, tune motor, increase deceleration time, remove load shock, use braking resistor if needed, verify capacity, reduce overexcitation gain, correct input voltage. |
| E04 | Overcurrent at constant speed | Abrupt load increase, low grid voltage, undersized VFD, output short/ground fault, vector parameters not tuned, low output voltage. | Remove abnormal load, stabilize input voltage, verify drive sizing, inspect output wiring/motor cable, tune motor parameters, correct output voltage condition. |
| E05 | Overvoltage during acceleration | Abnormal input voltage, external force dragging motor, acceleration too short, no braking resistor where required. | Adjust input voltage, remove external force, increase acceleration time, install braking resistor if required. |
| E06 | Overvoltage during deceleration | Input voltage too high, regenerative load, deceleration time too short, no braking resistor where required. | Correct voltage, remove external regenerative force, increase deceleration time, install/check braking resistor. |
| E07 | Overvoltage at constant speed | Input voltage too high, external force driving the motor during operation. | Correct input voltage and check whether the load is regenerating energy into the drive. |
| E08 | Snubber / buffer resistor overload | Input voltage outside specified range. | Adjust voltage to the specified range and check power quality. |
| E09 | Undervoltage | Instantaneous power failure, low input voltage, abnormal bus voltage, rectifier/buffer issue, drive board/control board issue. | Reset after supply is stable, correct input voltage, check power wiring and supply quality, seek support if internal circuit issue is suspected. |
| E10 | VFD overload | Motor/load stalled, load too large, VFD capacity too small, acceleration too fast, restart while motor still rotating. | Check mechanical condition, reduce load, verify drive sizing, increase acceleration time, use speed tracking or wait for motor to stop. |
| E11 | Motor overload | Wrong motor rated current setting, motor blocked, sudden load increase, low grid voltage, motor protection gain unsuitable. | Correct motor rated current, reduce load, check motor/mechanical condition, correct overload protection parameters. |
| E12 | Input phase loss | Input phase loss or reserved behavior depending model/settings. | Check three-phase input supply, breaker, fuse, contactor, terminals, and supply balance. |
| E13 | Output phase loss | Missing motor phase, loose U/V/W connection, motor cable issue, motor terminal problem. | Check U/V/W wiring, motor cable continuity, motor terminal box, and output phase loss protection settings. |
| E14 | Module overheated | High ambient temperature, blocked fan/ventilation, overloaded drive, poor panel cooling, dust or poor airflow. | Improve ventilation, clean airflow path, check cooling fan, reduce load, check panel temperature and derating. |
| E15 | External fault | External fault signal received through multifunction input terminal. | Check external safety chain, PLC signal, DI wiring, external fault input logic, and reset after the external issue is corrected. |
| E16 | Communication abnormal | RS485/Modbus communication failure, wrong address, wrong baud rate, wiring issue, master timeout. | Check RS485 A/B wiring, communication parameters, shield/grounding, PLC/HMI settings, and master polling. |
| E17 | Contactor abnormal | Internal or external contactor abnormal behavior. | Check power contactor circuit where applicable and seek technical support if internal fault is suspected. |
| E18 | Abnormal current detection | Current detection circuit, amplifier circuit, or current detection chip issue. | Seek technical support after checking external wiring and motor condition. |
| E19 | Abnormal motor tuning | Motor capacity mismatch, motor parameters not set from nameplate, tuning timeout, wiring issue between VFD and motor. | Select suitable VFD, enter motor nameplate values correctly, check U/V/W wiring, repeat suitable static/dynamic tuning. |
| E20 | EEPROM / parameter read-write error | EEPROM or main control board issue. | Seek technical support. Main control board replacement may be required. |
| E21 | Factory debugging / hardware abnormal group | Internal service/debugging-related condition depending drive state. | Do not attempt internal repair. Contact technical support. |
| E22 | Motor short to ground | Motor or motor cable short-circuited to ground. | Replace or repair motor cable or motor after insulation testing by qualified personnel. |
| E23 | Operation time reached | Accumulated operation time reached the set value. | Use parameter initialization/record clearing only after confirming maintenance requirements. |
| E24 / E25 | User-defined fault 1 / 2 | User-defined fault signal received through multifunction DI. | Check the external device connected to DI, PLC logic, interlock, and reset after solving the external issue. |
| E26 | Power-on time reached | Accumulated power-on time reached the set value. | Review maintenance requirement and clear record data if appropriate. |
| E27 | Load loss / offload | Running current is lower than offload detection setting; load may be disconnected or detection settings may not match actual operation. | Check load connection and adjust offload detection parameters according to application. |
| E28 | PID feedback lost during operation | PID feedback signal disconnected, feedback source disappeared, or feedback below configured threshold. | Check feedback sensor, wiring, analog input, PID feedback source, and feedback-loss threshold setting. |
| E29 | Speed deviation too large | Motor blocked, speed deviation settings unsuitable, wiring between VFD and motor abnormal. | Check machine condition, motor parameters, speed deviation settings, and U/V/W motor wiring. |
| E38 | Braking resistor short circuit | Braking resistor circuit short, wrong resistor wiring, or braking circuit issue. | Disconnect power, wait for discharge, inspect braking resistor wiring and resistor rating. Contact support if fault remains. |
| E42 | Temperature sensor failure | Temperature sensor damaged, ambient temperature too low at startup, or poor sensor contact. | Check environment. If fault persists, seek technical support. |
Overcurrent faults are usually linked to motor/load torque demand, output wiring, motor insulation, acceleration/deceleration time, or motor control parameters. The correct corrective action depends on when the fault occurs.
E02 During AccelerationIncrease acceleration time, check short circuit, tune motor parameters, check load inertia, and verify VFD sizing. | E03 During DecelerationIncrease deceleration time, check braking requirement, check overexcitation settings, and inspect motor/load condition. | E04 At Constant SpeedCheck sudden load increase, low input voltage, undersized VFD, output short circuit, and motor tuning. |
Overvoltage faults are commonly caused by high input voltage or regenerative energy from the motor/load. Regeneration is common in high-inertia machines, fans, centrifuges, hoists, conveyors, and applications where the load drives the motor during deceleration.
E05 During AccelerationCheck input voltage, external force dragging the motor, acceleration time, and braking design. | E06 During DecelerationIncrease deceleration time and check whether a braking resistor is required for regenerative energy. | E07 At Constant SpeedCheck high input voltage and whether the load is driving the motor during operation. |
| Fault | Technical Focus | Important Checks |
|---|---|---|
| E10 VFD overload | The drive is overloaded or undersized for the actual load. | Check load, acceleration time, restart of spinning motor, and drive capacity. |
| E11 motor overload | Motor thermal protection is triggered. | Check motor rated current setting, actual load, motor cooling, and overload gain. |
| E13 output phase loss | One motor phase may be missing or disconnected. | Check U/V/W wiring, motor cable continuity, motor terminal box, and loose terminals. |
| E16 communication abnormal | RS485/Modbus communication problem. | Check A/B polarity, address, baud rate, parity, timeout, shielding, and master polling. |
| E28 PID feedback lost | PID feedback signal is missing or below threshold. | Check sensor wiring, analog input, feedback source, scaling, and feedback-loss setting. |
To reduce troubleshooting time, share the following details:
Smidnya technical support can help review your fault code, drive model, motor nameplate, wiring photos, voltage readings, load condition, acceleration/deceleration settings, braking resistor setup, and F8 fault history data.