Fuji G7S inverter repair
Model: FVR110G7S
Fault: OC3 alarm
Fault analysis: the failure of Fuji inverter overcurrent fault alarm, according to the static measurement rule module fault, fault display Fuji inverter OC1, oc2, OC3, this is one of the most common Fuji inverter fault, which includes the current transducer acceleration, deceleration and overcurrent over current constant speed, the reason for this the fault are the following:
1) acceleration time is too short, this is the most common in our current phenomenon. Depending on the load conditions of our corresponding adjustment plus deceleration time, you can eliminate this fault.
2) the damaged power transistor may also cause OC alarm, Fuji inverter power transistor with the development of semiconductor technology after several generation, from the early for G2 (P2), G5 (P5), G7 (P7) GTR module series, G9 (P9) IGBT module series, IPM use the module until now, whether from the package or protection performance have been greatly improved, high voltage, high current, high frequency, low power, mute, multi protection function has become the development trend of high power transistor module. Fuji inverter high power transistor module damage may be caused by the following reasons:
Output load short circuit; load is too large, large current continues to appear; load fluctuation is very large, resulting in surge current is too large, it may cause OC alarm, damage the power module.
3) the driving circuit of driving a large power transistor is also a cause of the alarm. Fuji g7s, g9s respectively using pc922, two PC923 coupler as a core part of the driving circuit, the built-in amplifier circuit, the circuit design is simple, widely used several manufacturers including Fuji inverter by frequency converter. The most common phenomenon is the lack of phase, or three-phase output voltage imbalance.
4) detection circuit can lead to damage of Fuji inverter OC display alarm, detecting current Hall sensor due to temperature, humidity and other environmental impact factor, working point is prone to drift, resulting in Fuji inverter 0C fault alarm. Final detection based on fault exclusion is found to cause damage to the current sensor. After the replacement of the lifting of the fault.
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