East yuan inverter maintenance
Fault phenomenon: output three-phase imbalance
Fault analysis: to the customer site to see the start of the motor has obvious jitter, a long time on the alarm. Disconnect motor measurement output with three-phase unbalance. Preliminary elimination of motor faults. The inverter module is no problem. The transducer back repair, disassemble machines found driving circuit has short circuit, the main control board found no problem, the driving part burned in several places, and found that measuring optocoupler V driving voltage abnormal, replacement power test, the test procedure according to the main circuit to control the no-load, load check respectively. The power before the test to ensure the safety device, to prevent further damage to important devices, large capacity capacitor temporarily don‘t stop, instead of two small capacitors, in order to protect the IGBT power supply circuit of capacitor to IGBT series is the best incandescent bulb (that is, a dummy load power), if the display is normal. You can then start the inverter measuring 6 trigger pulse, the drive signal is normal, can be removed between the capacitor and the IGBT light bulb, for no-load operation with large capacitor, and then connected with the normal load operation, debugging machine after the return to normal.
Jia Hong Wei repair to provide the East yuan each series inverter repair: 7200MA, 7300PA, S310, E310, N310, GS510, E510, A510 series, such as the maintenance of the East yuan inverter. Hong Jia Wei Dong Yuan maintenance repair cable fault repair, overcurrent overvoltage, short circuit fault repair, maintenance, maintenance phase voltage under voltage maintenance, external alarm maintenance, radiator overheating maintenance, external alarm maintenance, inverter internal overheat repair, maintenance, braking resistor overheating inverter overload maintenance, DC fuse circuit breaker maintenance, repair, abnormal memory keyboard communication abnormal maintenance.
Jia Hong Wei maintenance process
The first step: ask the user inverter fault.
The second step: according to the user‘s fault description, analysis of the causes of such failures.
The third step: to open the equipment to be repaired, to confirm the damaged devices, to analyze the feasibility of maintenance recovery.
The fourth step: according to the working position of the damaged device, read and analyze the principle of the circuit, to find out the reasons for the damage.
The fifth step: contact with the customer, the report on the maintenance price, to solicit customer service advice.
The sixth step: to find the relevant devices for distribution.
The seventh step: to determine the inverter fault and the reasons are excluded, the power to carry out experiments.
The eighth step: in the case of the normal operation of the transducer, enter the system
24 hour repair service, quick response test.
Jia Hong Wei maintenance hotline: 13640994287 075528916839 Shaw
On site maintenance.