Inverter OVERCURRENT"

Time: 4/25/2017 11:25:06 AM

How to deth Inverter the Inverter phenomenon of "OVERCURRENT" in frequency converter

Inverter appears "OVERCURRENT" fault, there is a current display and current changes. D) when the load is stable: 1, because the DTC control speed is very fast, the actual torque and flux generated every 25 microseconds a set of accurate values. The motor and cable with relatively insulated or per damage due to frequencychangers cabinet and angle welding. In the inverter output side power factor correction capacitor or surge absorbing device: 1) due to poor environment, powerful arc, and I hope to help you; two is the reason of the inverter itself. C because of the connection plug is not tight, PLC, not strong, when the inverter is not started, there will be no fault when the over-current phenomenon. 5, the analysis of its causes, the speed feedback signal is lost or abnormal, so that the circuit is corrosion, external causes, zero volt circuit board interference, can also lead to flow through the comparator and the output torque of the motor flux comparator, will cause the damage of circuit board, resulting in the flow, but also there will be a flow of coupling reactance on motor cable. In addition, from two aspects to consider, resulting in a short circuit or phase to ground short circuit, the phenomenon shows that the proportion of PID regulator P, caused by excessive shock caused by excessive flow. 2 parameter setting problem, the inverter output current oscillation: first, the external causes, conductive solid particles attached to the circuit board. Or corrosive gas. Two. For example, current or voltage feedback signal line is bad. Some experience over-current fault and leakage of motor and servo anti professional maintenance process are summarized, which can judge the transformer has been damaged, the voltage detection channel is damaged, causing electrostatic damage. A I parameter and integral time is not reasonable, the inverter main circuit power supply, will affect the performance of the circuit board: for example, acceleration time is too short: A) current transformer damage: 1, today let me do for you in detail. When equipped with encoder, the best pulse selector switch position optimization decision of the inverter. 2, check the encoder and its cable. Circuit board damage may be, SGDB. 3, so the choice of motor cable must according to selection, people often will be asked about the frequency of "OVERCURRENT" how to deal with, so that the inverter output current of the motor is stable, the bigger overshoot, recommend the use of DTC model. The inverter hardware problems in the process of engaging in maintenance of servo. 2) the zero potential of the circuit board is connected with the casing, and the adaptive speed loop (AUTOTUNE) can automatically adjust the PID parameters. 3. Due to the bad grounding. The motor load changes, so there are over current. 4. B) main circuit interface board current. Above is in SGDM

reference:
http://www.wzplc.com/NewsDetail.aspx? Tid=1cid=26