Inverter Fault

1, the overcurrent (OC)

Inverter over-current alarm is the most frequent phenomenon.1.1 phenomenon
    (1) restarts, a liter of speed on the trip. This is very serious over-current phenomenon. Main reasons: the load short circuit, mechanical parts are stuck; inverter module damage; motor torque is too small to cause such phenomena.
    (2) on the power on the jump, a phenomenon generally can not be reset, for two main reasons: module bad, bad driver circuit, the current detection circuit bad.
    (3) does not restart immediately when the trip but when accelerating, for two main reasons: the acceleration time is set too short, the current limit is set too small, the torque compensation (V / F) set higher.
 

2, overvoltage (OU)

    Overvoltage alarm usually occurs during idle time, mainly due to the deceleration time is too short or braking resistor and braking unit in question.
     

3, under voltage (Uu)

    Brown is also a problem in that we use frequently encountered. Mainly because the main circuit voltage is too low (220V series is lower than 200V, 380V series is lower than 400V), mainly due to: a road bridge rectifier SCR three-way damaged or not working properly, there are likely to lead to voltage fault appears, followed by the main circuit contactor is damaged, resulting in DC bus voltage losses in the charging above resistance could lead to voltage. there is a voltage detection circuit failure and undervoltage problems.
 

4, overheat (OH)

    Overheating is a more common fault, the main reasons: the ambient temperature is too high, fan stall, poor performance of temperature sensors, motor overheating.

    

5, unbalanced output

    Unbalanced output jitter general performance of the motor, speed instability, the main reason: module bad, bad driver circuit, reactors and other bad.
 

6, overload

    Inverter overload also beat one of the more frequent failures, overload usually see we really should first analyze what is in the end self-drive motor overload or overload, overload due to the strong motor in general, as long as the motor drive parameter table parameter set properly, not the general Assembly general motor overload while the drive itself is poor due overload easily overload alarm. we can detect the inverter output voltage.

7, switching power supply damage

    This is the most common failure of many inverters, switching power supply is usually due to a short circuit caused by the load, Danfoss frequency converter using a new integrated controller UC2844 pulse width to adjust the output switching power supply, but also with a UC2844 current detection voltage feedback function, occurs when no display, no voltage control terminal, DC12V, 24V fan is not running and so we should first consider whether the switching power supply damaged.

8, SC fault

    SC Yaskawa inverter failure is more common faults. IGBT module is damaged, it is one of the causes SC fault alarm. Also driving circuit can easily cause damage SC fault alarm. Yaskawa drive circuit design, the use of the bridge drive optocoupler PC923, which is dedicated to drive the IGBT module with an optocoupler amplifier circuit, Yaskawa under the bridge drive circuit is used optocoupler PC929, which is an optocoupler with internal amplifier circuit, and detection circuit. Further motor jitter, phase current, voltage unbalance, frequency display there but no voltage output, these phenomena are likely to be IGBT module damaged. IGBT module damaged a variety of reasons, the first is the external load failure caused by damage to the IGBT modules such as load short circuit, stall and so on. Second drive circuit aging may also lead to waveform distortion, or driving voltage fluctuations caused by IGBT damage, leading to SC fault alarm.

9, GF- ground fault

    Ground fault is usually encounter failures, electrical grounding in reason to exclude the existence of the problem, the most likely failure is part of the Hall sensor, the Hall sensor due to the influence of temperature, humidity and other environmental factors, the work is easy drift occurs, resulting in GF alarm.

10, limiting run